US1465534A - Steady-rest shoe - Google Patents

Description

Aug. 21, 1923.

A. TURNER STEADY REST SHOE Filed April 5 Alba-1 @urner Patented Aug. 21, 1923.

ALBERT TURNER, orwonoEsTER, ivressnonusnrrs, n's srGNoa To noa'ron omma or WORCESTER, MASSACHUSETTS, A conrosnrron or MASSACHUSETTS.

STEADY-BEST SHOE.

Application filed April 5,1921. Serial Ira-458,705.

Toall. whom. it mag concern citizen of the United States of America, re-

siding at l/Vorcester, in the county of W'orces ter and State ofMassachusetts, have invented certain new and useful Improvements in Steady-Rest Shoes, of which the follow-v in is .a full, clear, and exact-specification.

My invention relates to work supports and more particularly, to a steady rest shoe for metal ,reducin zmachines, such as cylindrical grinding mac hines. A .In some classes of cylindrical grinding "where work ofa given size is produced in large numbers, the;-,work shoe of the steady rest is, in some cases, formed witha cylindrlcalbearmg surface adapted to fit the, surface of the work when ground to-theqreA quired size. Such a construction, however, leaves edges where the cylindrical surface ends, upon which the work' rests, at the beginning and during the major part of the grinding operation, because it is'then of slightly greater diameter than the curvature of the shoe. Since the work is supported on these edges by narrow line contacts, under the grinding pressure, theytend to digjnto' the work and mar its surface, particularly in roughing operations when the pressure on the work is relatively great due'toa heavy out being takenf If such edges of a shoe are, rounded off to prevent digging into the work, the construction is still objectionable shown in the patent to Wilcox et al No. 1,214,629 dated F eb. 6, 1917 ,to which refer- ;ence is made for a full disclosure of these in that it presents external cylindrical sur tosupport the work,.and ithas been found particularly in centerless grinding machines that the Work cannot be satisfactorily steadied by such a surface. ,7

It is the object of my invention, therefore, to overcome these difliculties by providing a shoe having a bearing surface which will fit the work when ground to size and also support it at all times during the grinding operation on a plane or concave surface or surfaces, wherebyscratching or otherwise marring its surface is substantially eliminated and the work is steadily held up to the action of the grinding wheel during the initial as well as the final phases of the operation.

In the accompanying drawings forming-a Figure 1 is aside elevation of my imoperation; and o a Fig.1 2 is-a similar vie, showing a slightly modified form of shoe and the relative "PO-11: sitions-ofwheel, work and shoe at the beginning of-a grinding operation, the size of, I the work being exaggerated to clearly illus:

faces instead of plane or concave surfaces,

'proved steadyrest shoe applied 'to a steady 9 Be it known that LiALBERr-TURNER, a]

relation between the grindingwheel, workand shoe at the completion ofa grinding trate the invention; 7

In the practice of my-invention,

a work shoe. 1 having'a bearing surfaceiorr surfaces to. receive ,the work W rotating in the direction indicated by V the arrows: (Figs.

1 and 2) on the usual centers'and in opera:-

tive engagement with the rotating grinding wheel ;V. Any suitable material, such as hardened steel, may be used to form that part of the shoe forming the. bearing surface theshoe readily detachable from the usual.

or surfaces. I may, andpreferablyzdo, make.

adjustablefsupport ,3, which is movably mounted on the base member 4, and adjusted horizontally and vertically to bring the' vshoe into proper supporting relation to the WOI'k by the screws 5 and 6 respectively.

The base ofthe steady rest, is clampedto the tab1e7by theusual clamping means 8. The

means for sup-porting and adjusting theposition of the shoe here described and shown more or less diagrammatically in the drawings are substantially the same as those parts. ;The manner of connecting it to the V steady rest is similar to that'shown inthe the shoebeing'shown provided with a. three; point, support and being clamped; in place 'by the screw 9. The shoe is shown having the work from thebeginning to the com pletion of the grinding operation. I

In the specific embodiment of my invention selected for'illustration, I have shown the shoe l having a cylindrical bearing sur face or surfaces 11 adapedto fit the work patent to Norton No. 1,009,989, Nov. 28,1911,

' at the finish of the grinding operation (Fig.

1) so that the work bears upon the cylindrical surface throughout. In Fig. 1, I have shown a form of shoe in which this cylindrical surfacei broken intermediate its outer edges by a cut-out portion 12 so as to form in effect two cylindrical surfaces having equal radii and being parts of the same surface of revolution. This type ofshoe is well adapted for use in taking light finishing cuts. In Fig. 2, I have shown a shoe having a cylindrical bearing surface unbroken between its opposite edges, and this type of surface is better adapted for use in taking heavy roughing cuts than the type shown in Fig. 1, for the reason that in taking heavy cuts the abrasive grains in the wheel are worn away rapidly and large chips are removed, some of which may lodge in the cutout portion 12 and finally get caught between the work and the bearing surface of the shoe and thus produce scratches onthe work. With the shoe having the continuou cylindrical bearing shown in Fig. 2 such a contingency is less liable to arise.

In both forms of shoes illustrated it is obviou that, since the work to be ground fits the cylindrical bearing surface of the shoe at the finishof the grinding operation, it would be supported at the beginning of the grinding operation only at the outer edge or edges of said surface if no further provision were made. Hence I have continued the cylindrical bearing surface 11 with auxiliary bearing surfaces13 and 14L forming, in effect, extensions of the cylindrical surface and which are shown in the drawings as being substantially tangent to the cylindrical. surface and merge thereinto. The outer edges 15 and 16 of said shoe are thereby spaced apart a distance sufficient to receive the work therebetween.

In Fig. 2 the size of the work is shown exaggerated compared with the finished size in Fig. 1 to more clearly illustrate the manner of support of the work at the beginning of the grinding operation, it being understood that the amount of stock to be removed isordinarily a very sinall fraction of'an inch on the diameter of the work.

therefore be seen that Ihave provided a construction which will support the over sized work on planesurfaces arranged at an angle to each other to form a V-shaped rest. Y

These lane surfaces mer e tan entiall 7 into p D D a concave partial cylindrical surface which has its radius substantially equal to that of the finished work for which the shoe is adapted. Hence as, the work becomes smaller it gradually settle down in the rest until it finally touches .the cylindrical sur- 7 face and is then supported along its entire extent. Since the work is at no tiine supported on an external cylindrical surface and there i no abrupt changefrom such a surface to a concave one, the work is per'' mitted to move'down the supporting plane surfaces of the V-rest gradually and without abrupt change.

faces act substantially. as portions of the concave cylindrical surface and the radius of the work intersecting the supporting sur 7 face remains normal. and perpendicular to such support at all times.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent is V 'A grinding machine steady rest compris ing a steady rest shoe of wear resisting material having a concave partial cylindrical surface of revolutionwhose radius substantially 'equals that of the finished work for which the shoe is adapted, saidscylindrical surface merging tangentlally into two plane surfaces arranged at anangle to 7 form a -V- shaped work rest, whereby work Wllljb'e final operation.

Signed at Worcester; Massachusetts, this 1th day of April 1921.

ALBERT TURNER. I 1

constantly upported on a plane surface during the initial stages of grinding until it substantially fits the partial cylindrical sur face and is there supported fully for the 75 i The outer tangential sur

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