US2377934A

US2377934A - Radius wheel dresser

Info

Publication number: US2377934A
Application number: US547195A
Authority: US
Inventors: Greig Arthur
Original assignee: U S TOOL AND Manufacturing CO
Current assignee: U S TOOL AND Manufacturing Co
Priority date: 1944-07-29
Filing date: 1944-07-29
Publication date: 1945-06-12
Anticipated expiration: 1962-06-12

Description

Juin 12, 1945.

A. GREIG RADIUS WHEEL DREssER Filed July 29, 1944 3 Sheets-Sheet 1 INV EN TOR.

Arf/wr Gre/'g 310ML/ 'I June 12, 1945. A, GREG f 2,377,934

RADIUS WHEEL DRES SER Filed July 29," 1944 3 Sheets-Sheet 2 vm @E l @i579 His A orne] June l2, 1945,. A. GREIG A 2,377,934

RADIUS WHEELI DREssER I A AFiled Ju1y'29, 1944 :s sheets-sheet s INVENTOR. Arf/7 lr-nl Grellg BY Patented June 12, 1945 RADIUS WHEEL DREssEa l Arthur Greig, River Rouge, Mich., assignor to U. S Tool and Mfg. Co., a corporation of Michigan Application July 2i), 1944, Serial No. 547,195

5 Claims. (Cl. 125-11) My invention pertains to dressers for dressing abrasive wheels-for precision grinding and more particularly to radius and angle dressers.

It is an object'of my invention to provide an improved wheel dresser which is more convenient, accurate and reliable for dressing abrasive Wheels for precision grinding.

It is also an object of my invention to provide an improved angle correcting radius wheell dresser, and method of operation.

It is a vfurther object of my invention to provide an abrasive wheel dresser which not only does the work of an ordinary radius dresser but' which may also be utilizedfor grindingcompound and compound complex forms on flat form tools andthe like.

Further objects and advantages are within the scope of the invention, such as relate to the cured rigidly on the other end, as by means of a screw 22 and a key 23. The aperture in the bodyis provided with enlarged counter-bores 25 and 2'I`in the opposite ends for snugly receiving the outer rings of two tapered roller bearings 3i disposed in opposing relation for rotatively supporting the main shaft whereupon the in ner bearing rings are snugly disposed. `The intermediate portion of the shaft whichireceives the inner race rings of the roller bearings is of reduced diameter providing |a shoulder near the arrangement, operation'and function of the related elements of the structure, to various details of construction and to combinations of parts,

elements per se, and to economies ofinaufacture and numerous other features as will be apparent from a consideration oi' the specification in conjunction with the drawings disclosing specific embodiments of the invention, in which:

Fig. 1 is a, side elevational view showing my improved angle correcting radius wheel dresser;

the nd of the crank with the diamond Edresser element therein;

Fig. 6 is an end elevational view,`partially dicrank end which rmly abuts the outer end of the inner ring of theadjacent tapered roller bearing. The other end of the reduced portion of the main shaft is threaded for receiving a nut 33 thereon lrmly abutting the outer end of the inner ring' of the other roller bearing which is disposed in an opposing relation to the .bearing adjacent the crank. The nut 33 may be secured in any well known manner, as by a lock-washer for example.'

The end of the body II adjacent the crank end of the shaft is closed and sealed around the shaft by means of a closure ring 35 'secured to the body, as by screws 37, and having a sealing glandsealed by any suitable shaft sealing ring 39, of which a suitable well known type is represented, comprising a leather collar 3B clamped around on the shaft I5 by a spring 4|) and'enclosed in an annular sheet metal ring 42 as shown in detail Fig.

The counter-bore in the other end of lthe body is longer in order to provide ample space for the bearing securing nut 33 anda second cloagrammatic and broken away, illustrating the use of the dresser;

Figs. '1 and 8 are 'diagrammatic views illustrating positions in which the dresser may engage a wheelto be dressed;

Fig. 9 is a plan view showing a position in which substantially cylindrical body I I having a. bearing aperture I3 extending axially therethrough. V.A main shaft I5, having a curved radius crank I1 extending rigidly from one end, passes through the axial aperture through the body and has a convenient adjusting handle i9 and hub 2| sethe dresser maybe used for dressing for combetween the second closure ring 4I and the hub 2| and this ring is rigidly secured to rotate with the shaft. as by means of the same key 23 which also secured the hub to the shaft. The ring 43 is plovided with an indicator finger M which projects adjacent the second closure ring which is provided with a suitable scale 45 for showing the various angular positions to which the main shaft ls is adjusted ni the body. The mam shaft v may be adjusted through any desired angle up to a substantial angle of about 40 and it is limited to lanydesired angular swing by means of a pair of stop screwsl which may be moved, to

various positions as represented dotted in Fig. 2,

and clamped in a T-slot 49 in the closure ring 4I so as to engage opposite sides of the indicator finger 4'4, as the handle I9 is oscillated from sideto-side.

The end of the curved radius crank I1 is provided with a radially directed aperture 5I wherein a Wheel dresser member 53 is slidably disposed. In the end ofthe crank I1 is a screw 55 having a knurled knob 51 for conveniently securing the dresser element 53 in any position according to the radius desired. To facilitate this adjustment, a radius determining measuring arm 59, having an L shaped head 6I, is provided. This may be inserted into a bushing 60 disposed in a radial aperture in the end of the crank to insure that the wheel dresser member 53 may be quickly and accurately positioned when moved radially, as indicated in dotted lines in Fig. 1. A

suitable thickness gauge 62 may be inserted between the point of the wheel dresser 53 and the head 6I. Also the member 6I may be moved radially and secured in various positions, as rep- .resented dotted, by means of a knurled screvtr 63.

The body II in which the main shaft is supported, and wherein it may be adjusted on an axis designated as the main axis, is in turn adjustably supported for adjustable angular rotation on an auxiliary axis which is at right angles to said main axis. As shown in Fig. 2, and more specically in Fig. 4, this is accomplished by mounting the body II upon the inner end of an auxiliary shaft 65 which passes through an upstanding wall 61 rising from one edge of a pedestal flange 69. Opening through the side wall of the body at right angles to the axis of the main shaft I5 is an aperture wherein one end of the auxiliary shaft 65 is inserted and secured. as by keys 1I. The other end of the auxiliary shaft A55 projects through to the other or outer side of the wall 61 and it is threaded for receiving a hub 13 and a handle 15 whereby to conveniently control the adjustment of the body angularly on the auxiliary axis. The outer side of the wall is provided with an annular socket 11 concentric with the shaft 65 4for receiving the adjacent end of the hub 13 when it is screwed upon the end of the auxiliary shaft. A washer 19 is provided on the shaft between the hub and the bottom of the socket. The hub 13 is provided with an aperture 8| which opens from the inner end of the hub and which is of a suitable diameter for receiving a compressed spring 83.

The inner side of the wall 61 engaging the body II thereon,l and the adjacent portion of the so that by drawing the auxiliary shaft 65 firmly in the wall by means of the hub 13 screwed thereon, the body is rigidly supported from the wall for very accurate angular rotation or adjustment on the auxiliary axis. Also, for this purpose, the base of the bearing projection 85 is preferably provided with an annular groove for receiving an intertting annular flange 89 projecting therein from the outer edge of the tapered socket in the body. As Fig. 2 shows', a

calibrated scale 9I is provided on the portion of the body which engages the bearing projection for cooperation with an index mark 93 on the latter, or the relation of these may be reversed as by placing the scale on the stationary part and the index mark on the adjustable body, as will be understood. In this manner accurate positioning and movement of the body- II are assured and the adjusted angular position of the bo-dy on the auxiliary axis is readily determined.

In operation, if it is desired to make a convex cutting face on the abrasive Wheel 95, represented in Fig. 7, the diamond point of the dresser element 53 is positioned under the center of the wheel. Initially the radial position of the dresser element in the crank I1 is set below the axis of the shaft I5 by a distance equal to the radius to be dressed on the wheel. As shown in Fig. 6, the pedestal of the dresser usually sets upon the chuck 91 of the grinder machine, against the parallel bar 99. For a convex surface on the wheel, which is a circular arc incross-section, the axis of the shaft I5 is set at zero angle, or parallel, to the horizontal or chuck 95, as represented in Fig. '7, and with the point of the diamond engaging the wheel below its center, the handle I9 is oscillated to move the point across the face of the rotating wheel.

But when dressing a wheel for forming a groove IIJI in a flat form tool |03, shown in Fig. 10, having an angle B, it is necessary to consider that the cross-section of the groove where it intersects the angular surface will be substantially different. If it is desired, for example, to have a circular cross-section where the groove IUI intersects the angular surface, the axis of the shaft I5 must be inclined at a similar angle B to the chuck to make a modified convex surface on the face of the wheel. The wheel will then form a groove I llI of a properlyf conformed cross-section sothat it will have the desired, circular, or other desired shape where it intersects on the angular surface. For a compound-complex angle, as where'there is also another face intersecting, the angle of the pedestal of the dresser is then inclined away from the parallel bar 99 using the front right corner as the pivot point, to the directly read angle that is called for (as this information may be provided on the blue-print) as represented in Fig. 9. requirements for various compound-complex angles can be conveniently met. For dressing a concave surface in the face of a wheel, the'diamond point 53 is set above the axis of rotation of shaft I5 by an amount equal to the radius of curvature desired, and the dresser. is utilized in the manner previously described.

This accurate, direct reading dresser obviates the costly labo-r wasting practice used in the old style hit-and-miss method of dressing radii by guessing where and how much back of center of the wheel the common dresser should be placed in order to prod ce the right radius.

It is apparent t at within the scope of my invention modifications and different arrangements.

may be made other than hereindisclosed, and the present disclosure is illustrative merely, the invention comprehending variations thereof.

I claim:

1. A radius and angle wheel dresser comprising, a base having a pedestal flange with an upstanding wall rising from along one edge thereof, a bearing projection projecting from the inner side of said wall and extending over the pedestal flange, said bearing projection having a circular cross-section, a bearing aperture passing through said wall and concentrically through said bearing projection, a body having a bearing aperture In this manner the l shaft projected through to the outer side of said wall being threaded, adjusting means secured upon the outer end of said auxiliary shaft, a main shaft `iiassing rotatively through the bearing aperture in said body, a radius crank extending rigidly from one end of said main shaft, a wheel dresser member extending movable radial- Lv through the crank for convenient adjustment toward or away from the axis of said main shaft,

means for securing said wheel dresser element in any adjusted radial position in said crank, manual means secured upon the other' end of said main shaft for rotating the main shaft and wheel dresser to various desired positions, cooperative calibrated scale andV index means for showing the angular 'position of the main shaft relative to the body, and calibrated scale and index means cooperatively on said wall bearing projection and body for showing the angular position of the body relative to said wall as adjusted upon the auxiliary axis.

2. In combination in a radius and angle wheel dresser, a base having a pedestal flange with an upstanding wall rising along one edge thereof, a bearing projection extending from the inner side of said wall over said pedesdal flange, said bearing projection being circular in cross-section, a bearing aperture passing through said wall and concentrically through said bearing projection, a substantially cylindrical body having abearing aperture extending axially therethrough and an auxiliary aperture opening through the side wall of said body perpendicularly to the main axis of the body, the outer portion of said body around the outer end of said auxiliary aperture` and adjacent the end of said bearing projection being suitably conformed for cooperative interiitting engagement therewith. an auxiliary shaft having` one end secured into said auxiliary aperture in said body and passing rotatively through the said wall as adjusted upon the auxiliary axis, and closure means for closing and sealing around the end of said main shaft and body.

3. In a radius and angle wheel dresser the combination in accordance with claim 1 and further characterized by having a pair of tapered roller bearings spaced apart in opposing relations in said body for rotatively supporting said main shaft. and stop means for stopping said main shaft in any adjusted angular position.

4. A radius and angle wheel dresser in accordance with claim 2 and further characterized by having aY T-slot opening 'from said second closure ring and extending curved around the axis of said main shaft, and a pair of stop screws adjustable in said T-slot to stop said main shaft in any adjusted position. and said index means being secured to and projectingfrom said main shaft over said Tslot.

5. In a radius and angle wheel dresser the coml bination of, a base having a pedestal flange with an upstanding wall rising from along one edge thereof, a bearing projection projecting from the inner side of said wall and extending over the pedestal flange, said bearing projection having a circular cross-section, a bearing aperture passing through said wall and concentrically through said bearing projection, a substantially cylindrical body having a bearing aperture extending axially therethrough, and an: auxiliary aperture opening through the side wall of said body per- 4 pendicularly to the main axis of the body, the

bearing aperture in said bearing projectionof member extending radially through'the crank for convenient adjustment toward or away from the axis of said main shaft, means nrmly securing` exmeansforshowingtheangularposition ofthemainshaftrelativetothebody,andcaii Vscale and index means cooperatively on wall bearing projection and body for showthesngularpositionofthebodyrelativeto outer portion of said body around the outerend of said auxiliary pertllre and the end of said bearing projectio being suitably conformed for cooperative inte ting engagement, an auxiliary shaft having one end secured into said auxiliary aperture in said body and passing rotatively through the bearing. aperture in said bearing projection of said wall, the end of said shaft projected through to the outer side of said wall being threaded, rotative means threadably secured upon the threaded end of said shaft, a main shaft passing rotatively through the axial aperture in said body, a pair of taper roller bearings disposed spaced apart in opposing relations for rotatively supporting said main shaft in said body, a radius crank extending rigidly from one end of said main shaft, said crank being adapted for radially supporting a dresser element for convenient adjustment toward or away from the axis of said main shaft, means for rmlysecuring a wheel dresser element in any adjusted position in said crank, manual means secured upon the lsealing around the end of the main shaft adjacent the manual adjusting end of the main shaft, a T-slot curved concentricaliy of said shaft in saidsecondclosurerinmlockingscrewsjnsaid .T-sl'ot, andl an' indicating pointer on said m'ain shaft and extending 'radially adjacent said sec- 4 .ond closureringfors'howingtneangularposition ofsaidshaftinsaidbodyandforengagement betweensaidlockingserewsforsecuringthe main shaft.

i AR'I'BUB GREG.