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June 25,‘1935. .1. c. DRADER ' 2,006,161 CHECKING FIXTURE Filed Nov. 15, 1929 mu \\ ON N\ 2 Sheets-Sheet l June 25‘; 1935“ ‘ 2,006,161 J. c. DRADER CHECKING FIXTURE Filed NOV. 15, '1929 .4m\,u%wk\mhx \ \\ / 2 Sheets-SheetZ 2,006,151“ Patented June 25, 1935 / 1‘ OFFICE UNITED STATES 2,006,161 CHECKING FIXTURE Joseph C. Drader, Detroit, Mich, assignor to Michigan >. Michigan. Tool Company, a corporation of Application November 15, 1929, Serial No. 407,500 1 Claim. (Cl. 33——174) This invention relates‘ to testing machines slotted ‘at each' end thereof to snugly ?tv and ‘ -' particularly suited for worm generating cutters. slide on said guide bar. Means is provided for sliding the carriage ’ II) . The main objects of this invention are to pro vide an ‘improved testing machine which 'will on its ways, and this. means preferably comprises 5 visually indicate a‘ minute irregularity in the a lead screw 20'journa1ed against‘ axial move; 5. surface of a piece of ‘work; to provide a'testing ment in an upstanding bracket 2! integrally m'a'chinefor accurately checking the angularity formed on one end of the bed plate medially of of. the sides of the teeth of a Work unit such as the-ways 6 and l. The'screw 20 is threaded into‘ a gear 'cu'tterfand to provide a simple and ac the adjacent end of the carriage I0‘ and a'hand‘ » 10 curate machine of‘ this character which is read~ wheel 22 is shown as rigidly secured on the end 10 ily. adjustable to'test pieces of work which vary thereof which projects through the bracket 2|, by a nut 23. ‘A sleeve or collar 24 maybe inter in size within a ‘wide range. ‘ ‘An illustrative embodiment of this invention ‘ posed between the hand Wheel 22 and bracket is"“shown ‘in the accompanying drawings, in 2!, and indexed‘ to co-operate' ‘with a mark‘ on 15 which the bracket, for measuring movement of ‘ th‘e " 15 ' Fig.1l is a top plan view of the improved test carriage ‘relative to the bed ‘plate. A knurled ing machine, with a piece of work in position headed set screw 25 is shown‘ asl'threaded 1n, thereon,"vv and with ‘its. position when reversed, the sleeve 2ll'for releasably‘ securing ity to the shown in dotted 1 outline.’ Fig. 2 is a View in'front elevation of the same. screw at any desired circumferential position. The carriage- it, at its rear side, is provided 20 Fig. 3 is‘ a‘fragmentary view in front eleva with an upstanding bracket 26, shown as integral tion, ‘with a master gauge form on the work ly, formed thereon, which has a vertically dis supporting ‘spindle. Fig. 4 is a' sectional view 25 posed, parallel sided slot therein which provides ' taken on ' the line 44-44‘ of Figl'2, looking in the direction indi guideways 21. The guideways 21 slidably sup? port a gauge frame 28 (see Fig. _1) which is 25] cated ‘by the arrows. In the construction shown in the drawings, an elongated bed plate frame 5 is provided on its shown as embraced thereby and'which is pro vided with a nut 29 and washer'30 which bear‘ upper ‘side with horizontally disposed parallel The top end of the slot which‘forms the ways 21 is closed by a crosshead '31 secured by screws 30. 30 ways. 6 and 'l which are bounded along their against the rear face of' the'ways. ' '1 ' ' outer sides by upstanding ?anges 8 and 9 respec 32 to the top end of the bracket 26. ‘The cross- tively. head ‘3i may snugly receive a vertically disposed ‘A carriage I0 is slidably mounted on the ways lead screw 33 which is‘ threaded through the ‘ 6 and 1, between the upstanding ?anges 8 and gauge frame28 for adjusting said frame verti 9, ; Means are ~provided for resiliently holding cally with respect to the carriage ‘Ill and bed 35 down and effecting a predetermined frictional plate-5. A handle 34, having a pair of upstandi restraint to the sliding movement of'the car ing vdiametrically opposed pins .35 and 36,'is ' riage; and said means may comprise vertically shown as rigidly mounted on the topv end of the disposed studs i lm-and t2 which extend upwardly, lead screw 33‘ for facilitating manual rotation 40 , through-slots l3 and M respectively formed in the bed plate parallel with the ways. The upper ends ofthe studs" ii and I2 are threaded into the carriage l0 and.’ thelheads thereofv are in spaced relation to the under side of the bed plat€-;.l.BDWZshaped leaf. springs l5 and it are interposed between the heads of the studs, and thereof. » ' . ‘ A visual-indicating- gauge 31 is rigidly mount ed on the frame 28 by a knurled headed screwv 38 which passes through alug 39 on thegauge and is threaded into the ‘frame 28. The in-f dicator 3i is preferably graduated to one thou sandth of ‘aninch, and the face thereof . is pref‘ are mounted thereon at their medial points with erably rotatable so that all readings xmay .~ be‘. the ends thereof frictionally bearing against the under side of the bed plate. ‘ taken from zero, if desired. ‘ The gauge frame 28 is shown as-provided with The bed plate 5 is also preferably provided an arm ‘it integrally formed thereon which ex 50 with a longitudinally extending, medially dis tends downwardly and toward the end of the bed. posed guide bar ll rigidly mounted on the top plate opposite to the end having the lead screw side thereof by studs I3 and i9 which pass up for moving the carriage. The lower end of the through suitable apertures in the bed plate and arm 40 has a lever M pivoted thereon by a stud 5 screw into the bar. The carriage is suitably screw 612. One end of the lever may be bifur 55 2. . . 2,006,161 Each tooth is successively brought ‘into and cated as shown at 43 to embrace a pin in the lower end of an indicator operating connection held in position as described, and when the 44, and the other end thereof may have the form same side of each tooth on the cutter has been of a pointer or ?nger 45, adapted to contact with thus examined, the cutter may be removed from Cl the surface of the piece of work to be tested, the the spindle and replaced in reverse position so .lever 4| thus serving as part of a connecting meansv between ?nger 45 and gauge 31. Any suitable means may be provided for sup porting a work unit to be tested, and the illus that the opposite sides or faces of the cutter The upper end of the bracket arm has one end of thus positioned for co-operation with the pointer teeth may be similarly tested. In thus revers ing the cutter, the nut 49 and collar 50 are removed to permit removal of the cutter 5|, and 10 trated means comprise an upstanding bracket before the cutter is replaced in reverse position a 10 arm 46 integrally formed on the bed plate 5 at suitable spacing collar is placed on the support and the rear side and adjacent to one end thereof. is then followed by the cutter, the latter being a suitably disposed work supporting spindle 41‘ 15 rigidlysecured thereto, as by ‘a nut", the-axis of said spindle being, in the illustrated instance, perpendicular to the plane of movement of the carriage 10. The other end of the spindle is 45; in case both of the sets of the faces of the teeth- 52 are alike, or comprise lines that__either 15 terposed between the nut andapiece of work 5|. The piece of work ‘5| shown in vFigs. 1 and 2 of the drawings is a, worm generating cutter in 25 whichthe teeth (52 thereof have plane sides. '-It ‘will vbe evident that there must be some cylindrical surface to which each straight line elementcomprised in any tooth surface of the illustrated vtype is tangent; and any member :whiohprovides a surface sustaining this relation cylinder forms being used anda corresponding" adjustment in any appropriate direction and/or plane being secured, as by moving the gauge‘ frame 28 in its guideways by rotating the lead 25 screw 33 in the appropriate direction. Although but one speci?c embodiment of thisv invention has been herein shown and described, it will be understood that numerous details of should be included in the mentioned tangential plane or should varytherefrom only in a pre determined‘ manner, the above procedure may shown as provided with retaining means in the then be repeated. 20 form of a knurled hand nut 49 which abuts Various sized cutters and pieces of work may againstga freely slidable spacing sleeve 50, in be tested on this machine, appropriate to master the construction shown may be altered or omitted 30 “ to successive corresponding surfaces provided without departing from the spirit of this inven by the teeth of any gear, any gear cutter or like tion, as de?ned by the following claim‘; and that work-unit that is to be tested is hereinafter re the described method, as. applied to a cutter ferred to as a “master cylinder” or form,—said whose tooth surfaces should lie in substantially ; member being suitable for use in the zero-setting radial planes, comprises ?rst determining a plane of the pointer or-dial of gauge 31; and, in the tangent to a cylinder having a ?xed axis; ‘zero operation of this device, it will accordingly be setting a gauge'which is provided with a ?nger understood that, to establish a tangent plane (said ?nger being then disposed in‘said plane, as at the desired level, a master cylinder form 53 by reason of its engagement with a master form may ?rst be placed on the work spindle 41 and concentric with said axis): thereafter disposing 40 the carriage l0 and ‘frame 28 may be moved un a work unit concentrically with said'axis ‘and til-the end of the ?nger 45‘ is on the top'dead so that a point in its surface that is to be‘ tested‘ centerv ‘of the cylinder. In thus positioning the lies in said plane and in engagement with said ?nger 45, suflicient pressure is placed thereon ?nger; and producing a relative parallel trans :5 by appropriate vertical movement of the gauge latory movement between ' said unit and said 45 frame 28‘ so- that the pointer hand of the gauge gauge with reference to said plane while observ will- move 'eitherway from the set position all ing said gauge. ' . back lash or lostinotion between parts being I claim: taken up; The'indicator gauge is then observed A device for testing the teeth or thread of an '1 and preferably set with a zero reading. element the sides of which are tangent to a circle, 50 The carriage is then withdrawn by rotating which includes, in combination, a base, a ?nger, the handwheel 22 and lead screw 20,: and the an indicator actuated thereby, an arbor ‘upon' cutter or otherwork unit to be tested put on the which the element to be testedmay be supported, spindle 41 in the place of the master cylinder. a cylinder of the same diameter as the base The carriage may then be moved until the ?nger circle of the element to be tested disposable on 55 45,its tip being raised orv lowered, if necessary, said shaft for setting the indicator 'to have the ' is- brought opposite and into engagement with ?nger disposed to move in a plane vtangent to the outertip of a cutter tooth and the cutter the base circle of said element, means for secur rotated onlthe spindle until the reading is again ing an element to be tested on the arbor to have . zero. The cutter 5| may then be clamped by the the side of its tooth in engagement with said .00 hand'nut 49 and the carriage moved forward to ?nger when the indicator shows said setting, and ward the spindle so as to cause the ?nger 45 means for advancing said ?nger over said tooth I to slide on the surface of the tooth. Depressions or thread to explore the surface thereof. or raised spots as well as any error in the angu 052 larity of thatside of the tooth which is thus‘ tested may be seen by observing the movement, it any, ‘of the pointer on the gauge 31. JOSEPH C. DRADER.