US1682672A - Grinding machine - Google Patents

Grinding machine Download PDF

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Publication number
US1682672A
US1682672A US48734A US4873425A US1682672A US 1682672 A US1682672 A US 1682672A US 48734 A US48734 A US 48734A US 4873425 A US4873425 A US 4873425A US 1682672 A US1682672 A US 1682672A
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wheel
grinding
cross
workpiece
grinding wheel
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Waldo J Guild
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Heald Machine Co
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Heald Machine Co
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B49/00—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation
    • B24B49/18—Measuring or gauging equipment for controlling the feed movement of the grinding tool or work; Arrangements of indicating or measuring equipment, e.g. for indicating the start of the grinding operation taking regard of the presence of dressing tools

Definitions

  • the present invention relates togriiiding machines.
  • it isa plicable to any ofthe various types of grin ing machines, but its particular utility is'in 5 connection with internal grinding machines for grinding 4the internal cylindrical or conical surfaces of sleeves, gears, bushings, ⁇
  • the general Aobject of the invention'is to l0 provide a machine of this class that is capable of rapid and eilicient roduction of such ar- Y ticles, ground and nished 'uniformly' to within the closest limits of the desired and predetermined diameters. More specifically,"
  • the invention provides a machine which en tirely eliminates'the necessity for interruptions of the grinding by the o erator, which interruptions have heretofore een frequent, for the operator to plug or gauge the work Size.
  • the machine is so organized that, in the grinding of each iece of work, there occurs, automatically rstly, the dressing or truing ofthe grindingr wheel, so that the final and finishing cuts which bring the Work to the desired size are always taken with a fresh cutting surface that is straight and true, for the production of a smooth truly cylindrical hole,-and Secondly, the automatic cessation lof grinding', I0 when the workpiece comes to size.
  • Fig. 3 is a top plan view of the parts shown and the like,
  • Fig. 1 is'a front elevation illustrating an internal grinding machineto which my in vention is applied.
  • Fig. 21 s a front viewoii a larger scale, illusl1 n n chanism of said main Iig. 2.
  • FIG. 4 is a sectional view on the line44-4 oilig-3. i m
  • Figs 5 and 6 are fragmentary sectional v iews, on an enlarged scale, taken, tively, onthe lines 5 5 and 6--6 o Fi 4.
  • Figf? isa view similar to Fig. 4, s owing respeca modification in the construction of the crossfeed mechanism.
  • Fig is a section on the line 8--8 of Fig. 7.
  • Fig. 9 is a fragmentary sectional view on the line 9-9 of Fig. 7.
  • Fig.. 10 is a wiring diagram of the elec trical parts and connections used in the Ineu chine.
  • procatory tablebr-carlieu i' ports and carries a wheel head 2, while t e work which isto be operated upon is held in a Work head 3, the latter being carried by a bridge 4, which spans the slideways provided by the machine frame for the back and forth movement ofthe table 1.
  • This back and forth movement of the table l to causethe rotating grinding wheel 5 to make the required interior traverse of the rotating workpiece 6 may be imparted in any Well known manner, as for instance, by the use of the fluid pressure controlling and reversing mechanism'which forms the subject jects matter of the copending application of Heald and Guild, Serial No. 629,882, tiled April 4, 1923, now Patent No. 1,582,468, granted April 27, 1926.
  • Such mechanism, or its equivalent forms no part of the present invention, and a detailed description thereof is therefore unnecessary; it is sufficient to note for the purposes of the present application, that the driving means employed for the reciprocation of the table 1, be it hydraulic drive, or
  • gear drive procures the reversal of said table at each end of the latters normal working stroke by the use of spaced adjustable dogs 7 and 8, carried by the table 1 and adapted to alternately engage and move a reversing member 9; the latter, during the grinding operation, when the wheel 5 is moving back and forth within the workpiece 6, is situated between the two dogs 7 and 8 in position to be struck alternately by said dogs, and by its consequent movement, first in one way and then the other, effects the reversals in the travel of table 1.
  • the grinding wheel 5 is rotated at high speed in any suitable manner,'as for instance, by a belt drive for the wheel spindle 10, the latter for this purpose carrying a pulley 10.
  • the workpiece 6 is also rotated, but at a slower speeld, this rotation being imparted in any suitable manner as by a belt drive, not shown, from a countershaft.
  • the cross-feed between work and grinding wheel is obtained by moving the wheel head 2 transversely of the reciprocatory table 1, but obviously, the invention is not limited in this respect, since the cross-feed mechanism, as hereinafter described, might as readily bc applied to the transverse movement of the work head 3.
  • the wheel head 2 of the machine is mounted on a cross-slide 11, the latter adapted to have an in and out movement on suitable ways 12 provided by a standard or bracket 13, Fig. 2, on the reciprocatory table 1. Movement of said cross-slide 11 is secured by rotation of a screw shaft 14, the latter enaagring an internally threaded member 15, Fig. 4, which is secured in any suitable way to the slide 11.
  • the screw shaft 14 is journalled in a stationary sleeve 16, the latter being carried by a forward portion 17 of the bracket or standard 13. Any suitable means may be provided for preventing endwise movement of thescrew shaft 14, as for instance, ball thrust bearings 18, 18 cooperatingr with a shouldered portion 19 of said screw shaft.
  • a slecre 20 is suitably secured, by a key 21, or the like, to the outer end of screw shaft 14, and on this sleeve is rotatably mounted a member 22, hereinafter called a drive ring.
  • a member 22 Projecting inwardly from drive ring 22 is a stud 23, having journalled thereon the integrally united spur gears 24 and 25, the larger of which, 24, is in mesh with stationary spur gear teeth 26 formed on the sleeve 16, while the smaller of which, 25, is in mesh with spur gear teeth 27 formed on the sleeve 20.
  • the drive ring 22 is subject to rotation, either by hand or automatically, as hereinafter described, and when such rotation is imparted, the gear 24, carried thereby aroundthe stationary ⁇ fear 26. is rotated on its own axis provided by the stud 23.
  • This last named rotation, in which the gear 25 also participates, is transmitted by said last named gear, in mesh with the teeth 27, to the sleeve 20, thus to impart rotation to the screw sh aft 14, but at an angular speed very much reduced from that imparted to the drive ring 22.
  • the manual rotation ofthe drive ring 22 is effected b v a hand wheel 28.
  • the latter as shown in Fig. 4, being integrally connected by a plurality of ribs 29 with an annular hub 30, which is journalled and turns freely on the outer periphery of the drive rin,f r 22.
  • annular member 32 Located adjacent the inner face of hub 30 is disposed an annular member 32. hereinafter called the dial ring. this member buving secured thereto in any suitable manner,
  • ratchet ring 34 which finds journal bearin on an inward extension of the drive ring 22.
  • Said ratchet ring 34 is the means by which the usual automatic inward feed of the grinding wheel 5, in response to the back and forth longitudinal traversing movements of said wheel, is imparted.
  • a member 37, Figs. 2 and 3 carrying a pawl 38 adapted to engage the teeth of ratchet ring 34, to rotate said ring and with it the dial ring 32, in a clockwise direction.
  • a roller is pivoted at 36 on the forward portion 17 of bracket 13 a member 37, Figs. 2 and 3, carrying a pawl 38 adapted to engage the teeth of ratchet ring 34, to rotate said ring and with it the dial ring 32, in a clockwise direction.
  • member 37 is adapted, at the end of each left hand longitudinal stroke of the table 1, to engage a stationarycam 40, Fig. 1, which is carried by a suitable bracket 41 rising from the machine frame, said cam being longitudinally adjustable on said bracket so that it can be set to be engaged by the roller 39 at the proper time.
  • any clockwise rotation imparted to the dial ring 32 is transmitted to the drive ring 22, and such clockwise rotation of the latter secures, through the reduction gearing above described, the rotation of the screw-shaft i4 in a direction to move the slide i1 inwardly, thus to feed the grindinfr wheel 5 toward the surface being ground.
  • 'ldlc pawl and ratchet drive 42, 43 permits said dial ring 32 to be turned counterclockwise by said hand wheel, as hereinafter described, Without transmitting its rotation to the drive ring 22.
  • the dial ring 32 carries a cam projection ltf1-which, in the clockwise rotation of said dial rirg, is ada t ed to engage successively with two adjusta "le screws 45 and 49..
  • The. screw ll5 is carried by a pivoted ett?, and the rocking of said member 46, 'under the influence of said cam 44, causes the engagement two elec trical contacts 47 and d8, Fig. 10.
  • the screw 49 is carried by a piyoted member 50, and the rocking of said member, under the influence of said cam 44, causes the engagement of two electrical contacts 51 and 52, Fig. 10.
  • electrical current may be supplied by a direct current generator 54 driven continuously by any suitable means, not shown, from the same source of power that is used for the rotation ot the grinding wheel or the work spindle.
  • One terminal of 'this generator 54 is grounded, as shown at 55. and the other is connected by a supply lead 56 to the 4central bar or plate 57 ci a two-way switch,'the latter being designated as Aa whole by the numeral 58 and being disposed, as shown in Fig. 1, on the front of the machine.
  • Said switch 58 provides additional contact plates or bars 59 and GO arranged on opposite sides oir the central bar 57 and adapted to be alternately connected electrically to said central bar 57 by a connector 61, which is mounted on an oscillatory member 62.
  • the latter is pivoted at 63 and in its normal position, as shown in Fig. 110, disposes the connector (il in contact with and across the two plates 57 and 59; in the other position of movable member 62, the connector 61 connects the two plates 57 and 60.
  • rlthe normal. position of movable switch member 62 is that shown in Fier. 10, and under these conditions, the supply lead 56 from the generator 54 is connected to a iead Si taken off ot the plate or bar 59 of the switch 58. Said lead 64- runs to the coil of an electrolnagnet 65 disposed in the front of the machine, shown in Figs. 1 and 10. A return lead 66 from the coil of the electromagnet 65 is connected to a finger 6T provided on any convenient stationary portion of thc machine trame.
  • a brush or plate 68 is carried by the table l, and during the normal working traverse of the table 1, when the grinding wheel 5 is moving back and forth within the workpiece, the finger 67 is in cor.- tact with the brush or plate G8.
  • the latter is connected by u lend 63a to the Contact termi nal e8. lVhcn the terminals Il? and 48 are lill.)
  • the dressing device 53 may be moved into operative position through the medium of fluid under pressure, more especiallyl when such pressure fluid is employed for imparting reciprocation to the table 1.
  • the means by which said pressure fluid is made available for the movement oi dressing device 53 into operative position forms, of itself, no part of the present invention, being fully described and claimed in the aforesaid application of Heald and Guild, Serial No.
  • the other operation devisated by said engagement is the automatic amplification of the reciprocatory path of table 1, to carry the wheel 5 past the dresser 53.
  • the left hand table dog 8 which limits the right handmovement of table 1 is carried by a block 79, which instead of being secured directly to the table l as in the case with the block 80 of dog 7, is mounted so as to be capable of sliding freely longitudinally of said table.
  • the block 79 of dog 8 is held in definite spaced relation to a block 81, which latter, the same as the block 8O oi right hand dog 7, is a stationary block adapted to maintain its'predetermined setting or adjustment longitudinally of the table 1, as given it by any suitable adjustment or holding devices, such for instance, as the hand screw nuts 82, 82 applied to both blocks 80 and 81 and engaging with the screw rack 83 on the table 1.
  • the device employed to hold the slidable block 79 in spaced relation to the fixed block 81 is here shown as a latch lever 84 pivoted at on block 81, and having its free end disposed by gravity in abutting relation to a shoulder 80 on block 79, thereby holding the block 79 at a predetermined distance to the right of block 81.
  • a latch lever 84 pivoted at on block 81, and having its free end disposed by gravity in abutting relation to a shoulder 80 on block 79, thereby holding the block 79 at a predetermined distance to the right of block 81.
  • a lead 96 runs from the switch bar 60 to the coil of a second electromagnet- 97, and the other end of said coil 1s connected by a lead 98 to a linger 99 carried by the machine frame preferably adjacent to the linger 67.
  • Said finger 99 makes contact witha brush or plate 100, carried by the table 1 ad] acent to the plate 68, and a lead 101 connects the plate 100 with the contact 52.
  • the inward feedmg of the grinding wheel 5 involves further clockwise rotation of the dial ring 62, which ultimately carries the cam 114. into engagement with the screw 49.
  • the parts are so set and adjusted, as hereinafter described, that this engagement takes place just as the workpiece 6 reaches the exact desired size; the consequent rocking of member 50 brings together the contacts 51 and 52 and completes the electrical circuit through the magnet 97, since the Contact 51 is grounded, the same as the Contact 47, at 473.
  • the electromagnet 97 is energized, causing attraction of an armature member 102 pivoted, as shown in Fig.
  • table dog 8 in the following manner Said table dog 8, as shown in Fig. 1, is pivoted at 104 to its carrying block 79, and normally rests by gravity against a pin 105, thereby to maintain its free end in position to engage and move the reversing member 9 at the end of the right hand normal working stroke of the table 1.
  • the mechanism automatically secures the complete cessation of the grinding operation, and the full longitudinal separation of the grinding wheel from the workpiece, permitting full access to said workpiece for its removal from the machine, and the insertion in said machine of a new unground workpiece while the grinding wheel 5 is entirely out o f the way.
  • the arms 95 and 108 of movable switch member 62 are offset from one another, as are also the corresponding striking arms 94 and 107, respectively, of the table 1.
  • the dog 8 upon engagement with the member 9, yields upwardly and then, after assing over said member 9, drops by gravity into its usual position, so that said member 9 thereafter is disposed between the striking faces of the dogs 7 and 8.
  • the quantity production of identical workpieces all ground to the same exact internal size involves a predetermined setting of the cross-feed mechanism above described, by the aid of a sample workpiece or pattern, which is first ground to exact size in any suitable way, as by the use of ordinary sizing plugs or gau es.
  • the various electrical and ot ier automatic deviceshereinbefore referred to are not em lo ed, and the cross-feed of the 'ndinv w ee is preferably effected by hand, t e hand wheel 28 for this purpose being secured ⁇ by screw 31, to the drive ringh22, Fig. 4.
  • the crosseed of the wheel 5 is diontinued, and the table l is then actuated to withdraw the grinding wheel from the workpiece and to dispose said wheel substantially in the dressing osition; this may be done by lifting the atch lever 84 manually and by shutting ofi' the supply of pressure fluid to stop the movement of the tab e when the latter reaches the desired position. Thereupon, the cross slide 11 being then in the precise position which secures the grinding of said workpiece to the desired inter* i!
  • the next step in the setting of the parte is to turn the dial ring 32, through the hand wheel 28, backward or counterclockwise from this zero position through a selected number of dial ring indications, which may conveniently represent thousandths of an inch, thc number of such graduations representing the distance by which the operator desires the automatic wheel dressin operation to precede the attainment of nished size by the workpiece; in this position of the dial ring, the screw 45 is adjusted so that its engagement by cam 44 will just bring the contacts 47 and '48 together.
  • the backward setting of the dial ring 32 to this point which signifies theiniiuguration of the wheel dressing operation, by energization of the electromagnet 65, should be accompanied by acorrespondingmovement Y of retraction of the cross slide 11, and this in turn involves a counterclockwise rotation of the drive ring 22 in unison with the dial ring 32.
  • the mechanism provides a pawl and ratchet drive between the ub 30 of hand wheel 28 and the adjacent face of dial ring 32, consisting of ratchet teeth 112 formed on the face of said dial ring, for col operation with a spring pressed member 113 contained in a recess of said hub 30, as shown in Fig.
  • the dressing mechanism is adjusted so that the diamond point 53 ⁇ when rocked down into operative position by the handle 78, will barely make contact with the l periphery of said grinding wheel this is donetent,-in other words, at each retraction, the
  • the settings of the cross-feed and contact mechanisms above described are adapted. for the production, by the machine, of any desired number of pieces, corresponding to the sainple workpiece and ground internally to the same diameter,it being iuiderstood, of course, that with each successive workpiece introduced to the machine, the grinding wheel 5 is fed inwardly automatically by the pawl and ratchet drive 38, 34 for the dial ring 32, whose clockwise rotation is in turn imparted to the drive ring 22 by the pawl and ratchet drive 42, 43.
  • the hand wheel 28, whose counterclockwise rotation is employed to produce the above described retractions of lcross slide 11, carries in any suitable manner, as by means of screws 114 a block 115, the purpose of which is to adj ustably support a transverse pin 116, whose ends project beyond said block.
  • the pin 116 is threaded, and its adjustment endwise in the block is secured in any suitable manner, as by a knurled nut 117 in threaded engagement with said pin and disposed in a recess of said block.
  • the drive ring 22 provides a pair of lugs 118 and 119,
  • the hand wheel 28 is turned countercloc wise; the dial ring 32 participates in this counterclockwise rotation from its very commencement, owing to the pawl and ratchet drive 113, 112 above described, but the drive ring 22 does not begin to move counterclockwise until the hand wheel 28 has been turned fai' enough to carr the left hand side of block 115 against the lug 118 of said drive ring.
  • the cam 44 carried by the dial ring 32 is, at each retraction of the cross slide 11, turned back a definite amount in excess of the turning back of drive ring 22, this amount being the distance showin on Fig.
  • the nut 117 should be adjust/ed 32, the hand wheel 28 also so that the cam 44 and the dial ring 32 will, at each such retraction of the cross Slide, be turned back in excess ot' the retraction of the drive ring 22, by an amount which is greater than the largest estimated possible wear of the grinding wheel, because it is this excess retraction which causes the axis of the grinding wheel to be moved ever ncarcr to the dressing plane at each successive dressing operation, in order that contact between the wheel and dressing device may be assured.
  • a single annular member 121 combines the functions of the drive ring and the hand wheel of the previously describen construction, said member having a hub por-A tion 122, journalled on the sleeve 2l) which is keyed to screw shaft 14, and said member providing the stud 23 for the support of the reduction gearing 24, 25 employed for the drive of said sleeve 2O through gear 27.
  • ratchet wheel 34 Directly secured to the annular member 121 is a ratchet wheel 34 and the usual pawl 38, actuated as above escribcd by the reciprocations of table 1, cooperates with said ratchet wheel to produce step-by-step clockwise rotation of member 121 for the maximal sive inward feed of cross slide 11.
  • the cam 44 in this construction is carried by a dial ring 32, the latter, as shown in Fig. 7, being rotatably mounted upon and supported by the annular member 121.
  • the dial ring 32 on its opposite sides or faces is provided with ratchet teeth 112, 126, the former for cooperation with a spring pressed pawl 113 carried by the annular member 121. and the latter for cooperation with a spring pressed pawl 123 carried by another ring member 129.
  • Said ring 129 like the dial ring 32, is mounted upon the annular member 121, and said ring 129 is frictionally constrained from rotation by the drag imposed by a pair of stationary spring pressed pads or shoes 130, 130, Fig. 8.
  • This mechanism is adapted to be adjusted and set in substantially the same manner as heretofore described for the successive en gagements ot cam 4-1 with screws 45 and 49, 10, whereby automatic dressing of the grinding wheel 4and subsequent automatic cessation of the grinding operation are secured.
  • the clockwise rotation of member 121 for the inward feed of cross slide 11 is imparted to the ring 129 by a post 131, Fig. 8, projecting from member 121 and received in an elongated slot 132 of ring 129; adjustable screws 133 and 134, at the ends of said slet, are adapted to be engaged by post 131, depending upon the direction of rotation of the member 121.
  • the manner in which the cam 44 is set back, on the retraction of cross slide 11, a predetermined distance in excess of the backward feed of'the other parts, is as tollows z-
  • the member 121 is turned backwz-ird by hand to retract the cross slide, and this counterclockwise movement is imparted to the dial ringr 32 by the pawl and ratchet drive 113, 112, the parts, except ring 129, which lags until post 131 picks up screw 1 3-1, moving backward in unison. Then, in the grinding of the next workpiece, the member 121 is given clockwise rotation, either by hand or by the pawl and ratchet drive 38, 34a.
  • the dial ring 32, carrying cam 44: will lag. because the'pawl 128 carried b v the normally stationary ring 129 will, by its engagement with one of the ratchet teeth 126, prevent clockwise rotation of the dial ring 32a. stationary, notwithstanding the inward feed of the cross slide until the member 121 has travelled far enough to carry the post 131 into contact with the screw 133 of ring 129: there after, the ring 129 is obliged to rotate in unison with the member 121,4 and this permits the dial ring 32 and cam 44 to partake of similar clockwise movement.
  • the automatic wheel dressing operation takes place in advance ot the final and tinishinrr cuts which bring the workpiece to the desired Finished size. and this interruption of the grinding operation on each workpiece. for lthe purpose of dressinY the wheel. relieves the sidewise pressure ci the wheel against the workpiece which has been buiit up in the grindy ing operation by successive advances of the cross-feed screw 14, and which pressure tends Thel ring 32 and cam 44 will be. held' sometimes to spring the wheei spindle 1t), and toe cause uneven wheei wear.
  • the combination with a grinding mai chine comprising means for supporting the work, means for supporting a grinding wheel, means for producing a reciprocating motion of one ot' said before-mentioned means with relation to the other, means to so control said motion as to cause a relative traversing motion between the wheel and the work, one past the other in contact, or to cause withdrawal of one from contact with the other and subsequent restoration to contact, a tool for dressing the grinding wheel so mounted that it is engaged b the said wheel when the contact between t e work and grinding wheel has been so interrupted, and feeding mechanism that causes the grinding wheel and work to move one relative to the other transverse to said traversing motion to maintain grinding contact; of devices operated directly by said feeding mechanism and operable on said motion-controlling means to cause the withdrawal motion and then to restore the contacting traversing relation of work and grinding wheel, whereby the grinding may proceed by a succession of uninterrupted traversing motion confined to the surface to be ground, and at a stage determined directly by the movement of the feeding mechanism, the contact of rinding wheel and work is
  • the combination with a grinding machine comprising means for supporting the work, means for supporting a grinding wheel, means for producing a reciprocating motion of one of said before-mentioned means with relation to the othenmeans to so control said motion as to cause a relative traversing motion between the wheel and the work, one past the other in contact, or to cause withdrawal ofone from contact with the other and subsequent restoration to contact, a tool for dressing the rinding wheel so mounted that it is engagedy the .said wheel when the contact between the work and grinding wheel has been so interrupted, and feeding mechat move one relative to the other transverse to said traversin motion to maintaln grindin contact; of evices operated directly by said feeding mechanism and operable on said motion-controlling means to cause the withdrawal motion and then to restore the contacting traversing relation of Work and grinding wheel, and means for automatically operating the feeding means during the traversing contact of the Work and grindingwheel before and after the withdrawal motion, whereby the grinding may proceed by a succession of uninterrupted traversing inotions confined to the surface to be ground,
  • a grinding wheel mechanism for procuring a cross-feed between said wheel and a workpiece, means responsive to successive feeding movements of said cross-feed mechanism for procuring cessation of grinding on successive workpieces. as the latter reach a. predetermined size, and means responsive to the retractile movements of said cross-feed mechanism. between successive grinding operations, for compensating for the Wear of said grinding wheel.
  • a grinding wheel. mechanism for procuring a cross-feed between said wheel and a workpiece means responsive to successive feeding movements of said cross-feed mechanism for procuring a dressing operation on said grinding wheel during the grinding of each successive workpiece, and means responsive to the retractile movements of said cross-feed mechanism. between successive grinding operations, for compensating for the successive reductions in diameter 0f said Wheel by said dressing operations.
  • a grinding wheel mechanism for procuring a cross-feed between said Wheel and a workpiece.
  • a grinding wheel mechanism for procuringa cross-feed between said wheel and a workpiece, means directly actuated and controlled bv said crossfeed mechanism in the grinding of each workpiece, and set in operation only after said cross-feed mechanism has caused preliminary grinding of a given workpiece, to procure a dressing operation on said grinding wheel, and means for automatically procuring cessation ofthe grinding operation on each workpiece upon the feeding movement of said cross-feed mechanism through a. redetermined distance beyond the point wiiere said dressing occurred.
  • a cross-slide in a cross-feed mechanism of the class described, a cross-slide, a driving member therefor, means for progressively and automatically advancing said member, a second member adapted to advance with said driving member, means operable by said second member for securing cessation of feeding movement of said cross-slide ⁇ and means automatically operated by the cross-slide operating mechanism in retracting the cross-slide for setting back said second member a predetermined distance in excess of said driving member.
  • said mechanism for procuring a cross-feed bc' tween said wheel and the workpiece.
  • said mechanism comprising a cross-slide, a driving member therefor, means for progressively and automatically advancing said member.
  • a second member adapted to advance with said driving member, means operable by said second member for securing cessation of the grinding operation by said wheel, and means automatically operated by the cross-slide operating mechanism in retracting the crossslide, following said cessation. for setting back said second member a predetermined distance in excess of said driving member.
  • a grinding wheel ⁇ a wheel dressing device.
  • a driving member for said criiss-slide. means for progressively and automatically advancing said member.
  • a second iiiemher adapted to advance with said driving member. means responsive to advancement of said second member for securin; r successively the operation of said dressing device and the cessation of grinding on the workpiece, and means automatically operated by thc cross-slide operating mechanism in retracting the cross-slide. following said cessation. for setting back said second member a prcdcwriiiined distance in excess of said driving member.
  • a cross-slide In a cross-feed mechanism of the class described, a cross-slide. an actuating niembci therefor. mains for progressively and autoniaticallv advancing said member, a secon'l member adapted to advance with said :ictuating member.
  • nir-ans operable by said second member for procuringr cessation of the .feeding movement of said cross-slide, a hand wheel operatively associated with said actuwheel, mechanism for procuring a cross feet between said wheel and the workpiece, said mechanism comprising a cross-slide, an actuu ating member therefor, means for progressivelv and automatically advancing said member, a second member adapted to advance with said driving member, means oper able by said second member for procuring cessation of grinding on said workpiece, a hand wheel operatively associated with said actuating member and said second member, and means automatically operated on the retraction of said cross-slide by said hand wheel, following said cessation of grinding, for producing,r an angular displacement between said actuating member and said second y member.
  • a cross-slide in a cross-feed mechanism of the class described, a cross-slide, an actuating member therefor, means ⁇ for progressively and automatically advancing said member, a second member adaptedto advance with said driving member, means operable by the advance of said second member Jfor procuring cessation of the feeding movement of said crossslide, and a hand wheel operatively associatedwith said actuating member and said second member and'adapted when operated for the retraction of said crossslide to secure a predetermined angular displacement between said two members, there being a lost motion connection between said hand wheel and said actuating member.
  • a cross-feed mechanism of the class described a crossslide, a memberrotatable in opposite directions to secure, respectively, the feeding and withdrawal movements of said cross-slide, a second member rotating with said first member when the cross-slide is fed, devices directly set in operation by said second member on its arrival at a predetermined point adapted to procurecessation of said feeding movement, and means operable on the reverse rotation of said members, to withdraw said cross-slide, and automatically procure a predetermined angular displacement between them.
  • a grinding wheel In a grinding machine, a grinding wheel, a mechanism for procuring a crossfeed between said wheel and the workpiecef mechanism comprising a cross-slide, ier rotate.l opposite directions 'to procure. rester be 'feeding and withdrawal mo 'd cross-slide, a second member aid first member when said cro '1 ted, devices directly set operati id .reward member on its arrival. at a mi.ed point adapted to procure cessation of the grinding opera.- tion on said workpiece, and means operable on the reverse rotation of said members, following said cessation, to withdraw said crossslide, and automatically procure a predetermined angular displacement between said members.
  • a rotatable actuating member In a cross-feed mechanism of the class described, a rotatable actuating member, two other rotatable members operatively asso ciated with said actuating member, friction means for restraining rotation of one of said members, a pawl and ratchet drive for the other of said members both from said actuating member and said frictionally re# strained member, and means for moving said irictionally restrained member from said actuating member, after a predetermined lost motion between them, whereby to automatically change the relationship of said other member with respect to said actuating inember, responsive to each double motion, clockwise and counterclockwise, ci said actuating member.
  • a feed screw In cross-feed mechanism of the class described. a feed screw, an actuating member for said feed screw, a pair of contact making devices, an element normally progressivelv advanced by said actuating member and adapted to successively act-nate said contact making devices, and means responsive to withdrawal movements of said feed screw ⁇ for changing the rotativeA relation of said element to said screw by a. predetermined amount.
  • a feed screw a driving element adapted when moved to turn said feed screw, a. pair of contact making devices, a ring normally carried by said driving element and adapted to actuate said Contact making devices, a hand wheel to withdraw said feed screw, and means, re
  • a feed screw a driving element adapted when moved to turn said feed screw, a pair of contact making devices, a ring normally carried by said driving element and adapted to actuate said Contact making devices, a hand wheel to withdraw said feed screw, and means, responsive to a withdrawal of said feed screw by said hand wheel to a. given position of said :feed screw, for changing the relative positions of said ring and said contact devices by' a predetermined amount.
  • a teed screw a driving element adapted when moved to turn said feed screw, a pair of contact making devices, a ring normally carried by said driving element and adapted to aetuate said contact making devices, a hand wheel to withdraw said feed screw, and means, responsive to a withdrawal of said iso feed screw by said hand wheel to a given position of said feed screw, for changing the relative positions of said ring and said coniact devices by a predetermined adjustable amount.
  • a grinding wheel In a grinding machine, a grinding wheel, a feeding element which, when moved, causes said grinding wheel and a workpiece to approach or recede, a dressing device, means for moving said grinding wheel and dressing device, one relative to the other, iii a line parallel to a geometrical element of the surface of said wheel, while maintaining the dressing device a fixed distance from the line.
  • the improvement which consists in determining approximately the amount of wear of a grinding wheel durin each grinding operation, causing a grinding wheel to be advanced into contact with successive work pieces (and thereby cutting said workpieces) by an increasing amount for each successive workpiece, the increase being a constant one and being greater than the largest estimated possible wear of the grinding wheel, at that stage causing said grinding wheel to be made tangent to a known plane by dressing, said plane being located close to the desired tinished surface locus of the workpieees and being relatively remote from the initial un ground surface locus of the workpieees, and then causing the grinding wheel to be advanced by an always constant amount in cutting relation to the workpieces, which amount is greater than the lineal measure of the amount of reduction of the grinding wheel by the dressing device, such excess heing equal to the difference between the esti- :ziated wear and the actual wear of the grinding wheel, and finally causing the grinding to cease at the end

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Constituent Portions Of Griding Lathes, Driving, Sensing And Control (AREA)
  • Grinding Of Cylindrical And Plane Surfaces (AREA)
US48734A 1925-08-07 1925-08-07 Grinding machine Expired - Lifetime US1682672A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR1682672D FR1682672A (enrdf_load_html_response) 1925-08-07
US48734A US1682672A (en) 1925-08-07 1925-08-07 Grinding machine
GB15940/26A GB256582A (enrdf_load_html_response) 1925-08-07 1926-06-24

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US48734A US1682672A (en) 1925-08-07 1925-08-07 Grinding machine

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US1682672A true US1682672A (en) 1928-08-28

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US (1) US1682672A (enrdf_load_html_response)
FR (1) FR1682672A (enrdf_load_html_response)
GB (1) GB256582A (enrdf_load_html_response)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496400A (en) * 1946-10-04 1950-02-07 Bryant Grinder Corp Feed carriage control mechanism
US2566875A (en) * 1948-01-14 1951-09-04 Optical Measuring Tools Ltd Optical scale reading device for rotatable dividing tables
US3812623A (en) * 1972-02-10 1974-05-28 Toyoda Machine Works Ltd Internal grinding machine
CN104209855A (zh) * 2014-08-30 2014-12-17 常州市万泰模具有限公司 磨床摇手轮

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8704436D0 (en) * 1987-02-25 1987-04-01 Jones & Shipman Plc Dressing unit

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2496400A (en) * 1946-10-04 1950-02-07 Bryant Grinder Corp Feed carriage control mechanism
US2566875A (en) * 1948-01-14 1951-09-04 Optical Measuring Tools Ltd Optical scale reading device for rotatable dividing tables
US3812623A (en) * 1972-02-10 1974-05-28 Toyoda Machine Works Ltd Internal grinding machine
CN104209855A (zh) * 2014-08-30 2014-12-17 常州市万泰模具有限公司 磨床摇手轮

Also Published As

Publication number Publication date
FR1682672A (enrdf_load_html_response)
GB256582A (enrdf_load_html_response) 1927-01-06

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