US1579933A

US1579933A - Apparatus for grinding rolls and the like

Info

Publication number: US1579933A
Application number: US446041A
Authority: US
Inventors: Lewis R Heim
Original assignee: HEIM GRINDER Co
Current assignee: HEIM GRINDER Co
Priority date: 1921-02-18
Filing date: 1921-02-18
Publication date: 1926-04-06
Anticipated expiration: 1943-04-06

Description

April 6 1926.

. L. R. HEIM APPARATUS FOR GRINDING ROLLS AND THE LIKE Filed Feb. 18, 192'; "r Sheets-Sheet 1 1 k anemi April 6 1926. 1,579,933

L. R. HEIM AFPARATUS FOR GRINDING ROLLS- AND THE LIKE Filed Feb. 18, 1921 7 sheets-sht 2 April 6, 1926. 1,579,933

L. R. HEIM 9 APPARATUS FOR GRINDING ROLLS AND THE LIKE Filed Feb. 18, 1921 7' 511 695411669 5 l l I l l l I l l l l f l l l I.

llLlllllvll A Suva WM 351 1 @MoznmgS April 6 192 L. R. HEIM APPARATUS FOR GRINDING ROLLS AND THE LIKE Filed Feb. 18, 1921 v sheets-sh't 4 gm WW rill! 35 k lbtOm LM S April 6 1926. 1,579,933 Ln R.I1EIN1 v -APPARATUS FOR GRINDING ROLLS AND THE LiKE Filed Feb, 1 1921 7 SheetsSheet 5 abbozmm s April, 6 ,1926.

L. R. HEIM APPARATUS FOR GRINDING ROLLS AND THE LIKE Fjjled Feb. 18, 1921 'r Sheet-SheQt 6 April 6v ,"1926.

- L. R- HEIM APPARATUS FORGRIND ING ROLLS AND THE LiKE Filed Feb. 18', 1921 '7-sh t sh t 7 mmnlllljth.

m-Hm, llllm.

abtmei s I Patented Apr, 6; 1926.

UNITED STATES -PATENT.oFFIcE.-

LEWIS R. HEIMI, OF DANBURY, CONNECTICUT, ASSIGNOR TO THE'HEIM GRINDER COM" PANY, OF DANBURY, CONNECTICUT, A CORPORATION OF CONNECTICUT.

APPARATUS FOR GRINDING norms AND THE LIKE.

Application filed February 18, 1921. Serial No. 446,041.

To all whom it may concern:

Be it known that I, LEWIS R. HnIM, a

citizen of the United States, and a resident of Danbury, county of Fail-field, and State 5 of Connecticut, have invented an Improvement in Apparatus for Grinding Rolls and the like, of which the following is a specification. f

This invention relates to the'grinding of 1 rolls and the like. One of the objects there of is to provide practical apparatus for the above purpose of rapid and efficient action. Another object is to provide apparatus of the abovenature in which a high degree of simplicity and security of construction are combined with ready adaptability to meet various conditions of use. Another object is to provide apparatus of the above nature in which there is an automatic corrective actionresulting in extreme accuracy in grinding of cylindrical objects. Another object is to provide a simple and practical apparatus of the above-mentioned character in which such an automatic correctiveaction may be rapidly carried on, and in which such corrective action may be made effective with great rapidity and reliability to cure such defects in the work pieces, such as rolls or the like, as inaccuracies 1n initial roundand in part pointed out hereinafter. v 'The invention accordingly consists in the features of construction, combinations of elements, arrangement of parts, and in the several steps and relation and order of each of the same to one or more of the others, all. as will be illuStratively described herein and the scope of-the application of which will. wbe indicated in the following claims. In the accompanying drawings in which is shown one of various possible 'einbodiments of the. mechanical features of this invention, p Figure 1 is a front elevation; Figure 2 is an elevation partially in section taken along the line 22 of'Figure 1 Figure 3 is a plan of the apparatus shown in Figure -1 certain parts'being cut away in order to disclose the construction more clearly;

Figure 4 is a sectional elevation of drivinggearing takensubstantially on the line 44 of Figure 1 and. showing the parts on an enlarged scale ness. Other objects will be in part obvious view taken along Figure 8 is a plan view of the support-.

ing means shown in Figure 7;

shown in Figure 8;

F1gure 10 1s a longitudinal sect onal elevation of a pair of carriages and adjusting Figure 9-is a side elcvationof the parts certain actions in connection withthe grinding of the roll.

Similar reference characters refer to similar parts throughout the several views of the drawings.

Referring now to Figure l of the drawings in detail, there is shown a supporting.

frame 10 having mounted thereon in

suitable ways

11 and 12 respectively thesIidin-

g carriages

13 and 14.

Respectively mounted upon these carriages are what will be termed a grinding wheel 15 and a regulating wheel 16, driven torotate as indicated by the arrows. The work here shown as a cylindrical roller 17 is mounted upon a suitablesupporting device 18 and positioned between the periphcries of the

wheels

15 and 16 to be engaged and acted upon thereby.

Turning to Figure 10 .of the drawings, 7

there is shown the

adjustingmeans ofthecarriages

13 and 14 which are provided with bearings 19 for the

shafts

20 and 21, which respectively carry the:

wheels

15 and 16. The carriage 14 is provided with a downwardly'ext-ending boss 22 through which is" threaded a' shaft 23 held against 'longitudinal' movement by means of the collars 24 resting against opposite ends of the bearing 25 on the frame of 'themachine.

-The'threaded portion of shaft 23 extends only throughout such a fraction of the .len-gth of the shaft as will give to the carriage 14 the desiredrange of travel, and

the unthreaded portion. extends through a sleeve 26 to a hand wheel 27 at the right-' ings.

hand end of the machine as viewed in the drawings. It will thus be seen that as the hand wheel 27 is rotated in one direction or the other, the carriage 14 is slid along the ways 12 either toward or away from the 28 similar to the boss ;22 internally threaded to receive the externally threaded sleeve 26 which extends through the bearing 29 on the frame of the machine and which is held against longitudinal movement by the thrust collars 30. This sleeve is of such length and so threaded as to give the desired range of travelto the carriage 13, but is of course smooth in the bearing 29 and extends to the right to make connection with the hand wheel 31, somewhat larger than the hand wheel 27, so' as to adapt these for independent adjustment. By the and wheel the position of the grinding wheel 15 is readily changed in a direction lengthwise of the machine.

Considering now the method of drive of the

wheels

15 and 16, it will be seen in Fig- -ure 3 of the drawings that their shafts are respectively provided with the

driving pulleys

32 and 33. The pulley 32 is driven by a belt 34 which passes under a jockey roller 35 and around the pulley 36 on the mam driving shaft 37 journaled in the lower por tion of the frame of the machine as shown in'Figure 2 of the drawings. The latter shaft is driven from any suitable source of powerby means of the belt 38 andtight and.

oose pulleys

39 and 40. The action of thejockey roller 35 journaled upon the swinging arm 41 .whichoscillates about a shaftg V the pulley .45, and the other, the member 61,

42 fixed on the frame of the machine, permits the carriage 13 to have its full-extent of travel without interfering with. the ef-. ficient drive of the grinding wheel.

On shaft 37 are fixed a pair of pulleys 43 and 44 respectively opposlte, apair of pulleys 45 and 46 which rotate about a fixed shaft 47 adjacent the opposite end of the base of the .machine as shownin Figure 1 of the drawings,'the details of these latter pulleys being shown in Figure 4 of the draw= The pulley 33 with its shaft is driven by the belt 48-froma pulley. member 49 through the speed-change gearing shown in detail in Figure4 ofthe drawings, but it may be noted that by the shifting of. thebelt 50 from a position connecting the small pulley 43 with the large pulley 45 to a position connecting the relatively larger pulley 44 with the small pulley 46, there is gained a change in driving speed with respect to the speed of the main driving shaft 37. Referring to the details of the mechanism shown in Figure 4, the pulley45 and pulley 46 have a bearing on a sleeve 51 and are bolted one to another by the'bolt 52 so as to turn as a unit with each other and with the sleeve 51.. The bolt 52 has mounted thereon a pair of pinions 53 and 54, the former being slightly larger and these pinions are carried around with the pulleys 45 and 46 rotating freely on the bolt. The

pinion 53' meshes with a gear 55 which is fixed to a sleeve 56, the latter being in turn keyed as at 57 to the fixed shaft 47 and thus held against rotary movement. The pinion 54 meshes with a gear 58 which is slightly smallerthan the-gear 55 and which is fixed to a rotatable sleeve 59. Thus as the pulleys 45 and 46 are driven, the pinions 5.3 and 54 revolve about the axis of the shaft 47 as well as rotate on the bolt 52. Due to the slight inequality of the sizes of these pinions and of their mating gears, and to thefact that the gear 55 is held against rotation, there is brought about an extremely slow rotationof the gear 58 to compensate for this inequality. Thus for each revolution of the pinions about the axis of the shaft 47 there is a movement of perhaps one or two teeth in extent of the gear 58, the direction of this movement being determined by the direction in which the parts are driven.

' The sleeve 59 has fixed thereon as at 60 a clutch member 61 adapted to co-act \vithan internal clutch surface 62 formed on the pulley 49. Furthermore, the pulley 45 is provided with a clutch portion 63 adapted to .co-a'ct with an internal clutch surface 64 with'two clutch members with which it may. alternatively make connection one ofthem,

the clutch member 63, being always driven athlgh speed from its direct connection with being always driven at low speed from its connection through the gearing above set forth. 'In order to make this alternative connection, the pulley 49 is slidable in the direction of the axis of the shaft 47 and is provided with a grooved hub 65 into which fits a hook 66 having threaded therein an adjusting shaft 67 held against longitudinal movement and operated as by the hand wheel 68 at the front of the machine.

It may be ,noted at this point that the shaft 47 as best shown in Figure 4 of the drawings, is inclined with respect to the horizontal and that theshaft 21 with its bearings is given a similar fixed inclination. This inclination and. its effect on the showing of the wheel 16 is so slight that to avoid confusion of lines, it is not indicated in certain figures of the drawings as its representation would give rise to confusion. The relation of the

wheels

15 and 16 however, due to this inclination is shown in an exag' gerated diagrammatic form in Figure 11 of the drawings and its function and advantages will be hereinafter described.

By the means above described, the wheel 16 maybe normally driven at extremely slow speed through the gearing shown in Figure 4 of the'drawings and this speed may be slightly altered to meet changing conditions by the shifting of the belt 50 without change in the speed of the main driving shaft 37. By slight adjustment of the hand wheel 68, however, this slow drive is broken and a frictional connection immediately made, whereby the wheel.16 is driven at a speed approxin'iately that of the wheel 15. A free movement of the carriage 14 with the wheel 16 is permitted by the jockey roller 69 similar in constructionand action to the jockey roller 35.

Considering new the supporting means for the work, it will be seen that the latter rests upon a hard steel insert 7 0 in the upper surface-of a carrier or plate 71 as shown 1n Figure 7 of the drawings. This carrier 71 is supported by a pair of

bolts

72 and 73 which pass through vertical slots 7 4 and 7 5 in supporting plates or posts76 and 77 secured to a bed as shown in Figure 9 of the drawings. The wedge '79 is interposed between the carrier 71 and is slidably mount.- ed within similarly inclined guides 89 formed on'the bed 81 which in turn rests on a rigid portion of the machine. The bed 81 is bolted to a rigid portion of the machine as at 82, the bolt passing through a slot 83 into a threaded opening 82 whereby the entire supporting device is movable to theright or left for purposes .of adjustment. The entire bed 81 and its associated carrier 71 may be raised vertically by engaging the bolt 82 in the upper threaded opening 82 provided in the bridge portion 103 in addition to the opening 82 .A vertical adjustment of the roll support may be gained by means of a hand screw 83 threaded into the member 81 and having a collar 84' interlock-- ing with the wedge 79. Thus as this'hand' the

bolts

72 and 73 whereby either 01' both ends may be raised or lowered. This gives a capacity of varying thesupport' angularly with respect to the horizontal, for the purpose hereinafter described.

It may also be'noted that the wedge 79 may be readily replacedby another wedge having differently inclined, supporting surfaces so that a different normal inclination ofthe carrier 71 maybe providedirrespec- Suitable gradua-- Also a vertical adtive of the angular adjustment facilitated by the

bolts

72 and 73.

' Clamped at each side of the member 71 by means of the bolt 72 passing through suitable openings therein are a pair of

guides

86 and 87, the latter of which is provided with set screws 88. These set screws permit'of anaccurate adjustment of the plate- 87 toward or away from-the plate 86 in order to fit these guides suitably to different diameters of rolls to be ground. The bolt 72 being loosened to the desired extent, the set screws 88 are driven in until it swings outwardly the upper end of the plate 87 to 'fit the rolhand at the same time clamp the various partsin position. These guidesare so positioned as to feed the rolls, however short, up into a position in which they are gripped between the grinding and regulating wheels. The

guide plates

86 and 87 may be adjusted Vertically. by causing the bolt 72 to engage the auxiliary openings 86 therein. The bolt 73 is likewise provided with a pair of

guides

89 and 90, the latter having a set screw 91 functioning in a manner substantially identical with that of the set screws 88. and the

guides

89 and 90 may also be adjusted vertically by engaging the bolt 73 with the auxiliary openings 89" in the plates. The

guides

89 and 90 receive the rolls just as they pass out from the grip of the wheels so that however short and however many rolls are acted upon at once, they are securely led up to and away from the grinding wheel.

- Considering no'w theaction whereby the rolls are fed along the carrier between the wheels, reference it again made to Figure 11 of' the drawings and to the inclination with respect to 'the horizontal of the regu- 1 lating wheel. .This latter wheel which travels at slow speed, exerts a much greater frictional etfect'on the rolls than that of the. high speed grinding wheel which cuts 0d the metal ofthe roll which is brought 110 into contact therewith. Accordingly the regulating wheel not only causes a continuous rotation of the rolls about their, own axes by lifting the adjacent side of the roll while the opposite side is forced down- 115 .wardly by the grinding wheel, but also when inclined with respect to the position of the roll, exerts alateral thrust thereon, tending to urge.themlongitudinally of the carrier 71. The-fixedinclination of the regulating wheel with respect to the horizontal may be in the neighborhood of: three degrees which if the. carrier were in a. hori zontal position, would give a maximum rate of feed of, the work. This is illustrated in Figure 11 of the drawings in which, as before noted, the inclination of the regulating wheel is much exaggerated. The carrier in this position of maximum speed of feed is horizontal, as indicated in fulllinesi If however the carrier were tilted into the I dotted line position, there would be no feeding action by the regulating wheel for its path of travel would'be zit-right angles with the path of travel of the rolls. Thus by Varying the inclination of the carrier between these extremes, anydesired rate of feed of the rolls may be attained, all without moving or adjusting the regulating wheel. i

.It will be understood also that the carrier may be tilted in the reverse direction from that hereinbefore noted so as to obtain a still greater rate of feed of the rolls than the maximum rate of feed hereinbeforenoted. It may moreover be noted-generally that the work support 'or carrier predetermines' the path of travel in an .axial direction of the work or rolls relative to the operative surfaces ofthe two wheels, and

aside from performing this important function also acts to take up the thrust of the grinding wheel on the work or rolls or to support or hold the work against such a thrust; the work support or carrier thus prevents the work from being displaced out of tlie'position which it is intended to have with respect to the two wheels or prevents the work from being moved out of its intended path of travel in a general axial direction, and thus the work is properly supported in operative-relation to the two wheels; the'terms work support or car-- rier therefore are to'be understoodas contemplating and including therein any suitable or appropriate arrangement for performing such functions as just pointed out,

Another feature ofthe' grinding action is diagrammatically illustrated in Figure 12 of the drawings. The regulating wheel 16 is mounted higher than the grinding wheel 15.

The difference in elevation is exaggerated in Figure 12 of the drawings but it may be noted that the axis of the regulating wheel is substantially equal in height. to .that of the center of the'wo'rk,whereas the grindingwheel is materially/below; With the parts in this positionj ifan irregularity or' projection in the surface of the roll be assumed to engage the regulating wheel, its engagement does not-result in a correspond ing movement of the work toward the grinding wheel with the grinding of a flat or depression on the opposite side of the roll. The outward pressurefflof the work due to this engagement is f in;a=horizontal direc+ tion, which direction Fisnoti radial to the grinding wheel and hence evengif' the roll moved horizontally, there would bea much smaller imperfection cut into its opposite side due to the curvature of the grinding wheel. In this manner, imperfections may be reduced and graduallydone'away with as the rotating work passes between the wheels. I I

" of the machine b the bolts 101 an It is also to be noted that the upper surface of the carrier 71 inclines upwardly toward the grinding wheel. This conformation' of the parts results in a raising of the work as it is forced in a direction away from theregulating wheel by the engagement of a projectin part with the surface of the regulating w reel. By a proper degree of inclination of this supporting surface, the work may be raised to just such desired extent as to prevent injury thereto due to its lateral movement caused as above.

Either or both ofthese features may be used and both are singly highly beneficial,

and either alone is highly beneficial although the grinding wheel 15 and .the regulating wheel 16. The single casing enclosing the wheels is rigidly secured to. the frame 10 suitable means such as is of "suchextent that ample movement of the

wheels

15 and 16 due to their

adjustable carriages

13 and 14 may take lace within the casing and without necessitating a corresponding movement of the

hood sections

92 and 93 respectively. The casing is provided with suitable slots 102* in the wall adjacent the bearings in the

carriages

13 and 14 so as to permit of the relative a'djustment'of the

wheels

15 and 16 within the casing throughout the desired range, the

shafts

20 and 21 passing through these slots. The front portion of each

hood section

92 and 93 is provided with a cover plate 94 which is removably held in place by means of a latch 95 and a wing nut a 95. Thus ready access to the wheels is provided.

' The lower portion of the casing providing the hood portions-92 and 93 is provided witha horizontal bridge section 103, more clearly shown in Fig. 9, upon which-"is mounted'the bed 81 ofthe support. for the 7 work carrier 71. The rear wall of the casing' 1s provided with a suitable opening,

through which a rearwardly extending portion of the carrier 71 may. extend to discharge the work after operation thereon by the wheels into a downwardly and forwardly extending chute 96 formed in th frame of the machine and leading-to an opening 97 at the front of the frame 10. Beneath the the opening .97 there is suspended as by hooks or lugs 98 on the pins 99 a removable receptacle or; reservoir 100 which contains a suitable liquid into which the finished work or rolls ma be dropped without injury. A wire bas et 104 is-suspended within the receptacle by means of which the rolls may be conveniently removed from the cushioning liquid independently of the liquid itself. ticular importance as it permits the return ofthework or rollsrto the front of the machine as fast as'they are completed or operated upon and are thus placed within ready reach of a workman stationed at the front of the machine in order that he may conveniently examine the result of the Work which is being done.

Referring particularly to Figs. 1 and 2, there is mounted upon theback of the detachablereceptacle or reservoir 100 a pump housing 105 in the lower end of which is rotatably mounteda suitable pump member preferably of the centrifugal impeller type. The pump housing 105 is extended upwardly to provid a hollow casing 106 in the upper end of which is formed a bearing 108 adapted to rotatably support the 'shai'tlOS) for,

driving the impeller in the base portion of the casing 105. A suitable opening 107 connected with the receptacle 100 is adapted to conduct the liquid from the receptacle to the central, or axial region of the impeller within the casing 105. which is provided at a suitable circumferential point with an outlet with which asuitable pipe connection 117 is connected for circulating the liquid. The pipe connection 117 leads to the pipe 118 extending downwardly through the protective casing about the

wheels

15 and 16 for conducting the liquid, which may be any suitable cooling liquid, to the operative snr-' faces of the wheels acting upon the work. The cooling liquid is returned to the reservoir 100 by means of chute 96. A substantially constant level ,is thus maintained in.

the reservoir 100 and, by reason of the hollow upwardly extending casing 106 being in connection with the reservoir 100, a like level is maintained within the-shaft housing 106. The housing 106 provides the bearing 108 for the shaft 109 at a height which is above the level of the cooling liquid and there is thusavoided-the' necessity of using a stuliing box in connect-ionwith the shaft 109, the bearing 108 being at all times above the level of the liquid.

At the upper end of: the shaft 109 there is mounted a gear 110 adapted to engage the gear 111 mounted on a jack shaft 112 and suitable bearings 113 preferably formed integrally with the pump housing 105 and its extension 106; Intermediate of the pair of bearings 113 there is mounted upon the shaft 112 a pulley 11 1 which is driven by means of a belt 115 from the pulley 116 mounted on the main driving shaft; Theratios of the gears and of the pulleys are such that a This arrangement is of par-' isuitably high speed of the impeller on the shaft 109 is obtained to cause an effective circulation of the cooling-liquid;

It will be noted that the pump in being mounted upon the rear of the detachable reservoir 100 is" readily removed with the reservoir 100 from the main frame of the machine so that inspection or repair, mayreadily be made. It may also be noted'that the liquid in the container 100 functions not only as a cooling medium for-the grinding' wheels and the work. operated upon thereby, but also functions as hereinbefore described to cushion the receptacle 100 so dropped therein without ,injury.

that the finished work or rolls may be:

Furthermore, the adjustment of the posi- .tion of both

carriages

13 and 14. is from the same end of the machine, which conduces greatly to convenience and rapidity in view of the large size ofmachines in use. The rate of drive of the regulating Wheel may, moreover, be conveniently altered to a slight extent, and when it is desired to drive it rapidly as for purposes of truing the Wheels, a slight adjustment of the hand Wheel 68 will bring about this acceleration of drive. The

carrier or work support is also conveniently adapted to various sizes and conditions of work and the rate of feed of the work which varies with the depth of cut and other.

factors, may be conveniently altered without affecting the rate of drive of the niachine,-or adopting the relatively cumbersome expedientof mounting the regulating wheel for angular movement. Also the automatic correction of errors in the roll without the production of corresponding errors by thegrindinglwheel is of the greatest value and 'co-nduces to the highest accuracy.

It will thus be seen that there is provided apparatus and an art in which the several objects of this invention are achieved and which are essentially practical in their nature. As various possible. embodiments might be made of the mechanical features of the grinding wheel adapted to berotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, a carrier extending between the operative surfaces of saidwheels for supporting a substantially round body in operative relation to said wheels, said regulating, wheel being adapted to controlthe rotation of said body on the carrier during the grinding III action thereon by the grinding wheel, and said carrier having a supporting surface which makes an obtuse angle with a plane tangent to the grinding wheel surface at the line of contact between the grinding wheel surface and the round body and adapted to permit said body, when irregularities thereon are engaged by the regulating wheel, to move into an increasing space between the grinding wheel and the regulating wheel.

2. In apparatus of the general nature of that herein described, .in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier between said wheels for supporting a cylindrical body in operative relation thereto, the path of travel of the operative surface of the regulating wheel being inclined with respect to the path of travel of the body along said carrier, thereby to feed said body along said carrier, and automatic means for maintaining a substantially constant distance between the axis of rotation of said body and the active portion of the surface of said grinding wheel when said regulating wheel tends to move the axis of said body substantially transversely of the path of travel of said body as said regulating wheel engages irregularities in said body. Y

3. In apparatus of the general nature of that herein described, in combination, a

main frame, a grinding wheel adapted to berotated at a relatively high speed, a regu-' lating wheel adapted to be rotated at a relatively low speed,.said wheels being adapted to present operative surfaces traveling in opposite directions, means plOVldlllg a movable carriage for mounting said grinding wheel on said main frame, means providing a movable carriage for mounting said regulatin wheel on said main frame, a carrier relatively fixed on said main frame and ex tending between said wheels for supporting round bodies in operative relation to said wheels, a threaded sleeve extending outwardly to one end of said main frame and engaging one of said carriages for manually ad usting said carriage toward or away from said carrier, and a threaded shaft extending outwardly through said sleeve to the same end of'said frame and engagin the other of said carriages for manually adjusting said carriage toward or away from said carrier. j v

i 4. In apparatus of the general nature of that'herein described, in: combination, a

main frame, a grinding wheel ada ted to be rotated at a relatively high spee a'regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in tending between said wheels for supporting round bodies in operative relation to said wheels, and independently operative and coaxial means for separately adjusting each of said carriages toward or away from said carrier.

5. In apparatus of thegeneral nature of that herein described, in combination, a main frame, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a rela tively low speed, said wheels being adapted to present operative surfaces I traveling in opposite directions,' protective means mounted on said frame for substantially enclosing said wheels and adapted to form a bridge extending substantially beneath the adjacent operative surfaces of said wheels, and a carrier extending between said wheels for supporting round bodies in operative relation to said wheels mounted upon said bridge portion of said protective means;

6. In apparatus of the general nature of that herein described, in combination, a

ing wheel adapted to be rotated at a relazatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, protective means mounted on said frame for substantially enclosing said wheels and adapted to form a bridge extending substantially beneath theadjacent operative surfaces of said wheels, a carrier extending between said wheels for supporting round bodies in operative relation to said wheels mounted upon said bridge portion of said protective means, and means for adjusting one of said wheels toward or away from said carrier independently ofsaid protective means. 7. In apparatus of the general that herein described, in combination, a main frame, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated ata relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, protective means mounted on said frame for substantially enclosing said wheels and adapted to form a bridge extending substantially beneath the adjacent operative surfaces of said wheels, a carrier extending between said wheels for supporting round bodies in operative relation to said wheels mounted upon said bridge portion 0 said protective means, and means for .detachably mounting said carrier on said bridge portion of said protective means.

nature of 8, In apparatus of the general nature of that herein described, in combination, a main frame, a grinding wheel ada ted to be rotated ata relatively high spee a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending rearwardly of said frame and between said wheelsfor supporting round bodies in operative relation. to said wheels, means for guiding said bodies in a rearward direction from the front of said frame onto said carrier, and

a discharge chute adapted to receive said bodies from .the grip of said wheels after operation thereon by said wheels and to re-' turn said bodies in a forward direction to the front of said frame.

9. In apparatus of the general nature of that herein described, in combination, a main frame, a cushioned receptacle mounted on the front portion of said frame, agrinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels for supporting round bodies in operative relation to said wheels, means for guiding bodies in a rearward direction from.,.the' front bf said fran'ie onto said carrier for operation thereon by said Wheels, and means adapted to receive said bodies from theigrip of said wheels after 0 eration thereon by said wheels and to can not said bodies into said cushioned receptacle.

10. In apparatus of the general nature of I that herein described, in combination, a main frame, a receptacle mounted on the front portion of said frame and adapted to contain acushioning fiuid, a grinding wheeladapted to be rotated at arelatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extendtive surfaces of saidwheels for supporting a substantially round body in operative relation thereto and providing a supporting surface for said body inclined toward the operative surface of said regulating wheel, said regulating wheel being adapted to rotate said body and to move said body relative thereto when said wheel engages an irregularity in said body, and said grinding wheel providing an inclined operative surface for' grinding said body whereby said inclined supporting surface of said carrier causes said body to be engaged by a more distant portion of said inclined operative surface of said grinding wheel when said regulating wheel engages a projecting irspeed, a carrier extending between the operative surfaces of said wheels for supporting a substantially round body in operative relation to said wheels, said regulating wheel being adapted to rotate said body and said grinding wheel providing an operative surface inclined away from said carrier for action on said body, and means for causing different portions of said 'inclined operative surface of said grinding wheel to operate up on said body when said regulating wheel engages 'an irregularity in said body.

13. In apparatus of the general nature of that herein described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, a carrier extending between the operative surfaces of said wheels for supporting a substantially round body in operative relation" to said wheels, said regulating wheel engaging said body on one side thereof and adapted to rotate said body and said grinding wheel engaging said body substantially Jon the other side thereof and adapted to pering between said wheels for supp-or'tinglforni a grinding action thereon, and autoduct saidbodies into said cushioned receptacle, and means for removing the bodies from said receptacle independently of said cil sh ioning fluid.- r. 11. In apparatus of the generalrnature of that herein. described, in. combination, a

" :giindin wheel adapted to" be rotated at a relative y high speed, a regulating Wheel adapted tobe-rotated at a relatively low speed, a carrier extending between the opera- 1' matic means for maintaining a substantially constant distance between the axis'of said body and the operative portion of the surface of said grinding Wheel while said regulating wheel moves the axis of said body during engagement thereby with irregularities in said body. i

14. In apparatus of the general nature of that herein described, in combination, a peripheral grinding wheel adapted to be rotated at a relatively. high speed, a regulating wheel adapted to; be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels for supporting a round body-in operative relationito said wheels,

means mounting said grinding wheel with its axis substantially below the path of travel of said body thereby to provide an operative surface inclined away from the operative surface of said regulating wheel, and

v 'means causing different portions of said in- 'posite directions, a carrier extending between said wheels and providing asurface for supporting round bodies in operative relation to said wheels, said surface being inclined toward the operative surface cf said regulating wheel, and means mounting said grinding wheel with its axis substantially below the path of travel of said body along said carrier thereby to provide an operative surface inclined away from the operative surface of said regulating wheel, said regulating wheel whencngaging a projecting irregularity in said body causing said body to ride up on said inclined supporting surface and thereby to be operated upon by a nioredistant portion of the inclined operative surface of said grinding wheel. 16. -I-n a paratus of the general nature of that' herein described, in combination, a grinding wheel adapted to be rotated at 40 operativesurfaces traveling in-opposite di- .rect1 0n s,,a carrier: extending between said wheels .for supporting a round body in opera relatively h.igh speed, a regulating wheel adapted .to be rotated at a-relatively low speed, said wheels being adapted to present ative relation to said wheels, means mount- 111g said grinding wheel to provide an operative surface inclined away from said carrier,

and means for liftingsaid body into con- Y :tact with more distant-portions of said oper- I ative; surface of said grinding wheel when irregularity in said body. v

', grinding wheel} adapted' to be rotated at a- ':rela tively,highspeed, aregulating wheel speed, said wheels beingad-aptedto presentsaid regulating Wheel engages aprojecting j 1'7. In apparatus, of the generalfnature of that herein 'describ ed, in combination, a;

adapted to be rotated alt-a relativelylow.

operative surfaces traveling in opposite. direction's, a pair'of relat vely fixed posts one ;on eachv side of the operative surfaces of "said wheels, a carr er'for'supporting a round body in operative relation to, said wh-eels mounted on said postsandextending betweensaid wheels, and means for vertically adjusting said carrier on said posts relative to one of said wheels.

18. In apparatus of the general nature of that herein described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, saidwheels being adapted to present operative surfaces traveling in opposite directions, a pair of relatively fixed posts one on each side of the operative surfaces of said wheels, a carrier for supporting a round body in operative relation to said wheels mounted on said, posts and extending between said wheels, and means including an inclinedplane for vertically adjusting said carrier on said posts relative to one of said wheels.

19. In apparatus of the general nature of that herein described, in combination, a

grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels for supporting a round body in operative relation thereto, and means including a movable wedge for vertically adjusting said carrier with respect to one of said wheels. v

20. In apparatus of the general nature of that herein described, in combination, a

grinding wheel adapted. to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed,said Wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels for supporting a round body in operative relation thereto, means including a movable Wedge for vertically adjusting said carrierwith respect to one of said wheels, and arranged to move said carrier a given distance in a vertical direction upon a relative movement longitudinally of said wedge greater than said iven distance, and means dependent upon the-greater relative longitudinal movement of said wedge for pro viding a visual indication of thehei ht of said carrier with respect to one ,0 said wheels.

21. In apparatus ofthe general nature of,

that hereindescribed, in combination, a

grinding wheel adapted to be rotated at a relatively-high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a pair of relatively fixed'posts one oneach side'of the operativesurface's of said wheels, a. carrier for supporting a round body in operative relation to said wheels mounted on said posts and extending beto one of said wheels.

being adapted to guide said 22. In apparatus of the general nature of that herein described, in combination, a

grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between sald wheels and adapted to support round bodies in operative relation thereto, means for supporting said carrier, means adapted to guide said bodies onto said carrier and into engagen'ient with said wheels and adjustable toward or away from said carrier, and means for locking said adjustable guiding means and said carrier to said supporting means.

.23. In-apparatus of the general nature of that herein described, in combination, a grindin wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said Wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between-said wheels and adapted to support round bodies in operative relation thereto, means for vertically adjusting said carrier relative to one of said wheels, means adapted to guide said bodies onto said carrier and into engagement with said wheels, and means for locking said guiding means and said carrier together in position.

24. In apparatus of the general nature of that herein described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at-a relatively low speed, said Wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels and adapted to support round bodies in operative relation thereto, means for supporting said carrier, a guiding flange on one side of said carrier, a second'guiding flange on the other side of said-carrier, said flanges bodies on said carrier into engagementwith said Wheels, means for adjusting one of said flanges toward or away from the other, and means for locking said relatively adjustable flanges and said carrier to said supporting means. i

25. In apparatus of the general nature of that herein described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling-in opposite diguiding means rections, a carrier extending between said wheels and adapted to support round bodies in operative relation thereto, means for adjusting the relative inclination between said carrier and the path of the operative surface of said regulating wheel, means adapted to guide-said bodies on said carrier into engagement with said wheels and adjustable toward or away from said carrier, and means for' locking said guiding -1neans and said carrier in adjusted position.

26. In apparatus of the general nature of that herein described, in combination, a grinding wheel adapted to be rotated-ate relatively. high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels and adapted to support round bodies in operative relation thereto, means for sup porting said carrier, means adapted to guide saidbodies on said with said wheels and adjustable toward or away from said carrier, means adapted to guide said bodies on said carrier after operation thereon by said wheels and adjustable toward or away from said carrier, means for adjusting said carrier, with respect to one of said wheels, and means for lockin said and said carrier in ad usted position.

' 27. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, means for supporting a round body in operative carrier into engagement relation to said wheels, means for driving Wheel at a relatively low speed and in a direction to present an operative surface traveling in a direction opposite from that of the grinding wheel, and means for varying the rate of drive of said regulating wheel in said direction.

28.-In apparatus of the general nature of that herein described, in combination, a grinding'wheel, aregulating Wheel, means for supporting a round body in o erat'ive relation to said wheels, means for a justing one of said wheels toward or away from the other, means for driving said grinding wheel at a relatively high speed, means for driving said regulating wheel at a relatively low speed and in" a direction to present an operatives'urfac'e traveling in a direction opposite from that of the grinding wheel, permitting a positive action of 'said driving means irrespective of the relative adjustment of said wheels, and means for verymg the rate of drive of, said regulating wheel insaid direction.

29. In apparatus of the general nature of that herein described, in combination,

. a grindi g wheel, a r g lating wh el, means for ,drivin said grinding wheel at a relatively higi speed, means for drivlng said regulating wheel at a relatively low speed and 'n a direction to present an operative surface traveling in a direction opposite from that of the grinding wheel, means adapted to drive said regulating wheel at a relatively high' speed, and manually controlled means for selecting either of said regulating wheel driving means.

30. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, means for driving'said grinding wheel at a relatively high speed, a member driven at a relatively low speed, and a second member driven at a relatively high speed, a, third member in driving connection with said regulating wheel, and selectively controlled means for placing said third member in driving connection with either sa1d low I I speed member or said high speed member.

31. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, a main driving member adapted to drive said grinding wheel at a relatively high speed, a "clutch member driven from said mam driving member at a relatively low speed, a second clutch member driven fronrsaid main driving member at arelatively high speed, means in driving connection with said regulating ,wheel, and selectively controlled means for lacing said last mentioned means in driv- 1ng connection with either of said clutch members.

32; In apparatus of the general nature of that herein described, in combination, 'a grinding wheel, a regulating wheel, means for driving said grinding wheel at a relatively high speed, means adapted to be driven at a relatively high speed and provided with a clutch member, a second clutch member coaxial with said first clutch member and driven from said high speed means at a relatively low'speed, and means adapted to place said regulating wheel in driving connection with either of said clutch members.

33. In apparatus of the general nature of that herein described, in combination, a

grinding wheel adapted to be rotated at a.

relatively high speed, a regulating wheel speed, said wheelsbeing adapted to present operative surfaces traveling in opposite di-l rections, a carrier extending between said wheels and adapted to support rolls in operative relation thereto, means providing a fixed relative inclination between the path of travel of'said rolls on said carrier and the path of said regulating wheel whereby said rolls are given a fixed rate of forward feed between said wheels, and adjustable means for varyingsaid rate of feed of rollsv from said'fixed rate of feed.

34. In apparatus of the general nature of that herein described, in combination, a grindin wheel adapted to be rotated at a relative y high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels and adapted to support rolls in operative relation thereto, means providing a fixed relative inclination between the path of travel of said rolls on said carrier and the path of said regulating wheel whereby said rolls are given a fixed rate of forward feed between said wheels, and means for varying the rate ofdrive of said regulating wheel to vary said fixed rate of feed.

35. In ap aratus of the general nature of that hereln described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed,.said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels and adapted tosupport rolls in operative relation thereto, means providing a fixed relative inclination between the path of travel of said rolls on said carrier and the path of said regulating wheel whereby said rolls are given a fixed rate of forward feed between said wheels, and means for varying said fixed rate of feed by adjusting the inclination of said carrier relative to said path of the operative surface of said regulating wheel. 7

36. In apparatus of the general nature of that herein described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be. rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels and adapted to support rolls in operative relation thereto, means mounting said regulating wheel adapted to provide a fixed relative inclination between the path of its operative surface relative to the path of travel of rolls on said carrier thereby to give said rolls a fixed rate of forward feed between said wheels.

37. In apparatus of the general nature of that herein described, in combination, a grinding'wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels and-adapted to support rolls in operative relation thereto, means mounting said regulating wheel adapted to provide a fixed relative inclination between the path of its p rative surface relative to the path of travel of rollson said carrier thereby to give said rolls a fixed rate of forward feed between said wheels, and means for varying the rate of drive of said regulating wheel to vary said fixed rate of feed.

38. In apparatus of the general nature of that herein described, in combination, a

main frame, a grinding wheel adapted to be rotated at a relatively high speed, supporting means on said frame for said grinding wheel, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions. supporting means on said frame for said regulating wheel, means extending between said two wheels for holding work in operative relation thereto, supporting means for said last-mentioned means, two of said supporting means being movable with respect to the third and in directions to permit adjustment of the distance between said two wheels and of the distance between said work holding means and one of said wheels, and inclependently operative andcoaxial means for adjusting the position of said twomovable supporting means with respect to the thirdsupporting means.

39. In apparatus of the general nature of that herein described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a relatively low speed, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier extending between said wheels forsupporting round bodies in operative relation thereto, a reservoir adapted to receive a cooling fluid, a pump for circulating said fiuid to the operative surfaces of said whcels, and means for conducting said bodies after operation thereon by said wheels into said reservoir, said fluid acting to cushion said reservoir for said bodies.

-10. In apparatus of the general nature of that herein described, in combination, a main frame, a grinding wheel adapted to be rotated at a relatively high speed, supporting means on said frame for said grinding wheel, a regulating wheel adapted to be rotated at a relatively low speed, saidwheels being adapted to present operative surfaces traveling in opposite directions, supporting means on said frame for said regulating wheel, means extending between said two wheels for holding work in operative relation thereto, supporting means for said lastmentioned means, two of said supporting means being movable with respect to the third and in directions to permit adjustment of the distance between said two wheels and of the distance between said work holding means and one of said wheels, a rotary member having connections with one of said movab e s pp rting eats a r ng drpon r tation thereof to move said supporting means, and a rotary member rotatable about said first-mentioned rotary member arranged upon rotation thereof to move the other of said movable supporting means.

. Y 41. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, and driving means adapted to be connected to a source of power for driving said two wheels and arranged to permit said grinding wheel to be driven at a relatively high speed and said regulating wheel at a relatively low speed but in a direction to present an operative surface traveling in a direction opposite from the direction of the operative surface of said grinding wheel, said driving means including a variable speed mechanism for changingthe rate of drive of said regulating wheel. I

42. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, means for holding work of round section in operative relation to said wheels, means for driving said grinding wheel at a relatively high speed, thereby to perform a rinding operation on said work, and means for driving said regulating wheel at arelatively low speed thereby to control the rotation of said work, said last-mentioned means comprising speedreduction and speed-change mechanism.

43. In a paratus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, means for driving saidvgrinding wheel at a relatively high speed, a member adapted to be driven at a relatively low speed, a second member adapted to be driven at a different speed, a third member in driving connection with said regulatingwheel, and means controllableat will for placing said third 'member in driving connection with either said first-mentioned member or said second-mew tioned member.

44. In apparatus of the general nature of that herein described, in combination, a grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at relatively low speed,

said wheels being adapted to present operative surfaces traveling in opposite directions, means for holding work of round section in operative relation to said two wheels, means for driving said grinding wheel at a relatively high speed, a plurality of members adapted to be driven each at a different peripheral speed, means in driving connection with said regulating wheel, and means for selectively placing saidlast-mentioned means in driving connection with one of said plurality of members.

45. In apparatus of the general nature of thatherein described, in combination, a main frame having supported thereon a grinding wheel, a regulating wheel adaptedto be rotated at relatively low speed, and means for holding work of round section in operative relation thereto; means su ported by said mainframe and arranged to be driven from a source of power for driving said grinding wheel at a relatively high speed: a plurality of members rotatably supported by said frame and adapted to be driven from said source of power, each of said members having a different peripheral speed; and means for driving said regulating wheel and arranged to be placed at will in driving connection with one of said plurality of members.

,46. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, a carrier for supporting cylindrical bodies in operative relation to said wheels, and means including a pair of coaxially mounted handwheels operable from the same portion of the apparatus for independently adjusting each of said wheels toward ,or away from said carrier.

47. In apparatus of the general nature of that herein described, in combination, a

grinding wheel, a regulating wheel, driving means adapted to be connected to a source of power for driving said two wheels, said means including speed change mechanism adapted to'permit said grinding wheel to be driven at a relatively high speed and said regulating'wheel to be driven at a relatively low speed, and means for varying the rate of drive of said regulating wheel.

48. In apparatus of the general nature of that herein described, in combination, a

main frame, a grinding wheel, a regulating wheel, said wheels being adapted to present operative surfaces traveling in opposite directions, a carrier for supporting round bodies in operative relation to said wheels,- protective means mounted on said frame for r enclosing said wheels, and removable panels mounted on said protective means, each of said panels being substantially opposite one of said wheels to permit access thereto.

49. In apparatus of the general nature of that herein described,- in combination, a grinding wheel; a regulating wheel; means for holding work of round section in" opera tive relation to said wheels and arranged to provide a predetermined path of travel for r said work past the operative "surfaces of said two .wheels; means for driving said grinding wheel at a relatively high speed, thereby to perform agrinding operation on said work; means for driving said regulating wheel at a' relatively low s eed, said wheels being adapted to present a jacent operative surfaces traveling in optposite directions, and the path of travel of olined with respect to said path of travel of e operative surface of said regulating wheel being in-' work provided by said work holding means, said last-mentioned driving means including a variable speed mechanism; and means for changing the relative inclination between the path of travel of the operative surface of said regulatin wheel and the path of travel of the worr provided by said work holdin means.

50. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, a carrier extending between said' wheels for supporting round bodies in operative relation to said wheels, and a single movable wedge extending in the direction of said carrier for vertically adjusting said carrier with respect to one of said wheels.

51. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, 'a carrier for supporting round bodies in operative relation to said wheels, means adapted to guide said bodies onto said carrier and into engagement with said wheels, precision means for adjusting said guiding means toward or away from said carrier, and means for locking said guiding means in adjusted position. v F

52. In apparatus of the general nature of that herein described, in combination, a grinding wheel, a regulating wheel, a main source of power adapted to drive .said grinding wheel, means driven from said main source of power and adapted to be placed in driving .connection with said regulating wheel, and speed reduction gearing driven from said last mentioned means and adapted to be placed in driving connection with said regulating wheel to drive said regulating wheel at a different speed.

53. In apparatus of the general nature of that herein described, in combination, a-

between said last mentioned means and said regulating wheel to drive said wheel at a atively low speed and in a direction to present an, operating surface traveling in a direction opposite from that of the operative surface of said grinding wheel.

54. In apparatus of the general nature of that herein described, in combination, a

main frame, a grinding wheel. supported thereby, a regulating wheel on said frame and operativelv related to said rinding wheel, a mam rivmg shaft rotata 1y supported b said frame and adapted be connecte to a source of power, drivin connections between said shaft and sai wheels having included therein speed-change mechanism arranged to permit said grinding wheel to be driven at are'latively high speed and said regulating wheel at a relatively low speed and in respective directions to cause said two wheels to present adjacent operative surfaces traveling in opposite directions, and means extending between said wheels for holding work of round section in operative relation to said two wheels.

55. In apparatus of the general nature of that herein described, in combinatioinfa.

main frame; a grinding wheel supported thereby; a regulating, wheel supported by said frame and operatively related to said grinding wheel; means for holding work of round section inoperative relation to said. two wheels and arranged to provide a .pre-

determined path of travel for the work past regulating wheel and saidflwork holding means being related one to the other. so that there exists a' relative inclination between the path of travel of the operative surface of said-regulating wheel and the path of travel of work along said work holding. means; and means for changing the relative inclination between .the ath of travel of the operative surface '0 'said regulating wheel and the path of travel of the work along said work holdin means.

56. In apparatus 'of t e general nature of that herein' described, in combination, a main frame; a grinding. wheel supported thereby; a regulating wheel supported by said frame and operatively related to said grinding wheel; means for holding work of round 1 section in operative relation to said wheels and arranged to provide a pgedetermined path of travel-for the work past the operative surfaces of said two wheels,; the path'of travel of the operative surfaceof said regulating wheel bein inclined with respectto the path of trave for the work lg a driving sha supported by said frame and adapted to be connected to a source of ower; driving connections between said provided present operative surfaces traveling posrte directions, a carr1er exten 1 said work holding means,

P shaft and said wheels having included therein speed-change mechanism arranged to permit said grinding wheel to be driven at a relatively high speed and said regulating Y wheel to bedriven at a relatively low speed and in respective directions to cause said two wheels to present adjacent operative surfaces traveling in opposite directions, said driving connect-ions having also included therein mechanism to permit at will a change in the rate of drive of said regulating wheel; and means for changing the relative inclination between the path of travel of the operative surface of said regulating wheel and the path of travel of 'work along said work holding means.

57. In apparatus of the general-nature of that herein described, in combination, a peripheral grinding wheel adapted to be rotated at a relatively high speed, a regulating wheel adapted to be rotated at a rela- .-tively low speed, said wheels being adapted to present operative surf-aces traveling in opposite directions, and a carrier extending between the operative surfaces of said wheels for supportinga round body in operative relation to the wheels, and providing a path of movement for'sa-id body in a direction sub-' stantially transverseto the axis thereof but inclined with respect to the radius of the grinding wheel tofthe point of contact thereof with said body. r 58. In apparatus of the general nature of that herein described, in combination, a peripheral'grinding wheel rotatable ata rela-' tively highs eed, a peripheral regulating wheel adapte to be rotated at a relatively low speed, said, wheels being adapted to in opng be tween said wheels for supporting a round body in operative relation thereto, and means mounting said wheels with the axis of said regulatin wheel at an elevation higher than the-e evation of said grinding wheel;

59. In apparatus of the general nature of that herein described, in combination, a pcripheral grinding wheel rotatable at a relatively high speed, a peripheral regulating wheel adapted tobe rotated at a relatively low speed, said wheels being "adapted to present operative surfaces traveling in 'opposite directions, a carrier extending-between said wheels for supporting a round body in o erative relation thereto and having a wor supporting surface which is inclined 'with'respect to the line joining the axes of said two wheels.

In testimony whereof, I have signed my name to this specification this twenty-fourth day of January, 1921.

LEWIS a. tram.