US2328826A - Clearance angle radius dressing attachment for surface grinding machines - Google Patents

Description

Sept. 7, 1943.

' CLEARANCE ANGEE RADIUS DRESSING ATTACHMENT FOR SURFACE GRINDING MACHINES Filed Dec. 13, 1941 2 Sheets-Sheet l R T. MCQUILLAN 2,328,826

. IN VENT0 R. fiobert 11.7710 Qvu zllan/ R. T. M QUILLAN CLEARANCE ANGLE RADIUS DRESSING ATTACHMENT Sept. 7, 1943.

FOR SURFACE GRINDING MACHINES Filed Dec. 13, 1941 2 Sheets-Sheet 2 4 AK 1 0 9 o wmwl 39% w T Tr k f ,7 o A, 230 a e 2 9 [T9 9 m 5. $5 1 ruL v 1 9 2 V 2 o o 5 f? w a? 1 Q My 9 9 9 l 9 a, 6 A 7 ,6 1 ow 6 T. 2 on .1 6 1 w 6, r 8\ w 1 w 2 In" 2 m MJ w 9 9 INVENTOR.

ATTORNEY Figure 4 illustrates the hinge plate 24 as being provided with four bores 88, 90, 92 and 94. Rotation of the arm 32 may be limited through I V the medium of stop pins 88, 9|, 93 and 05 respectively slidably disposed in the bores 90 through 94.

c To dress a concaved radius, as in Figure 13, the cutting unit 34 is adjusted to bring the cutting element 36. above the axis 42. ,If. the grinding wheel 95 is to be provided with a concaved profile 98 in its peripheral face having a radius;

of .25 inch, the point of the cutting element 36 is located .25 inch above the'raxisJlZ. f V

Figure '7. illustrates the manner in which the cutting unit is adjusted to the foregoing require- .ments. A hood I00 having a pin I02 receivable element 36 is located above the axis 42 a distance determined by the desired radius of the profile.

In Figure 11, the tool is set for dressing the peripheral face I32 of the grinding wheel I36,

in which case the arm 32 is latched against oscil- I latory movement by the pins 93 and 95 in, the

bores 92 and 94.

Figure 10 illustrates the cutting element adjusted fordre'ssing the side face I38 of the grind- 1 ing wheel I40. In this case, the arm 32 is held in engagement with the pin 89.

In providing a clearance angle for a radius turning toolwhich is to take the radius, the

hinge plate .24 may be set to the desired clearance angle by means "of a protractor and then locked in position through tightening of the pin I2.

in a bore I04 in the arm 32 is extended ,over the.

cutting unit 34. The hood is elevated to a'posiin thei'r're'spective bores.

tion which brings its bottom face engageable with the cutting unit .250 inch above the axis '42.; This position is determined by a micrometer I08'ei1gag ingFthe bottom faceof-the arm 32 and "theytop face-of the hood I00, the thickness of All the stop pins'89, BI, 93 and 95 are slidable Figure 16 illustrates the stop-pin 89 as having alongitudinal slot I40 inwardly of one end thereof to provide opposed fingers- I 32 resiliently urged against the wall of the hood being predetermined so that its bottom face may be accurately determined through'the medium of themicrometeri The bottom face I I0 of the arm 32 is also'constant withrespect to v its positional relationtothe axis 42.

After the setting of the hood I0D,-the pin I02 'ismade secure by a set screw II2 threaded into the arm 32. The cutting unitii l is then adjusted to bring its cutting element 36 intocontact with the face I06 of the hood'IIlIL When so positioned, the cutting unit 34 isfirmly secured in position through tightening of'the setscrew 64.

After removal of the hood I00, the grinding wheel 96 of Figure 13 may be dressed to a .250

, inch concaved radius by placing the dressing tool under the grinding wheel of the surface grinder and rotating the knob 46, back and forth, which imparts oscillatory motion to-the cutting element 36 across the face of the grinding-wheel 9'6.

The cutting element 36, when viewed-according toFigure 3, is located vertically of the axis 42, which axis is'in parallelism with the side edges N4 of the'base 20, which base is located so I - 1. A device of the type described-comprising v against the rail of the magnetic chuck (not I shown) oscillating the cutting element 35' across the peripheral face of the. grinding wheel 96, the pins 89 and 9| are projected into'the path of the arm 32 to'limit its oscillatory motion. The arm may be rotated 90 in both directions'from avertical'plane intersecting theaxis 42.

Figure 14 illustrates the manipulation of the tool for grinding 'a' convexed profile H3 on the grinding wheel I20 throughout an; arcjof 180.

When grinding such a *profile,the cutting element is located .250finch beneath the axis 42, as-

suming that the profilerl I8 isto. have a, radius of .250 inch. The stop pins 89and 9Imay be employed-when dressing the profile I I8.

In dressing a profile: I22 merging with a side face I24 and aperipheral face I26 of the grinding wheel I28, the pinsf89 and 93 are employed,

which limits oscillatory motion of the farm 32 oana gof' V. I In. Figure 15, the cutting elementiifijis'located beneath theaxis 42 a distance corresponding to theradiusof, curvature desired in the profile V Figure r12 illustrates a concaved profiled I '30 p in one side and the peripheral face margins of a grinding wheel I32." In" grinding such a profile,

I, the pins 89 and 93 are employe'dj but the cutting limits.

the bore. In the operative'position of Figure 16, the unslotted end'of the pin is projectedfor engagement with the arm 32. To render the pin ddinoperative, the pin is shifted to the dotted line position of Figure 16. In either position,

the fingers I 32 are tensioned against the wall of the bore so as to prevent accidental shifting and loss of the pin. -All thepins' are of thesarne construction. 4 I 1 Withoutfurther elaboration, the foregoing will so fully illustrate my invention, that others may, by applying current knowledge readily adapt the same for use under various conditions'of service. I

a base, an upright member pivotally connected at its lower end with the baseand having a bore,

an arm having :a shaft'rotat ably -'mounted in said bore and 'ashoulder engaging'one face of said member, said arm having a tool carrying endr located laterally of the axis of rotation of I the armf'said member being provided with a I plurality of-bo'res' intersecting said one face and spaced one from the otherin the path of said shoulder when said'arm is rotated about its axis, and pin means respectively slidable in said plurality of bores to lie inwardly of said one face or to be selectively projected beyond said face into the path of said shoulder to restrain the arm from rotation beyond predetermined 1 i 2; A device of the type described comprising a base, an upright'member pivotally connected at its lower end with the base andhaving a bore, an arm' having a shaft rotatably mounted in said bore'andia shoulder engaging one face of said member, said arm having a tool carrying end located laterally of the axis of rotation of the arm, said member being provided with a plulimits,

v3. The invention described inclairn 2 wherein u said arm is provided with an end groove having side walls converging toward 1 plane'ipassing throu'ghfth'e axis of"rotation-' of-the arm; a tool Ha ing a cylindrioallpody'engageable with said" body to press the latter against said side faces, and means threadedly felated to said armfor clamping the cap agains 't said cylindrical body. a (1.;T1'1E1I1Ve1'1ti0i). desoribedin olaim 2 wherein side I walls L converging toward a plane passing side faces, a capengageable witnsaid cylindrical ."through the axis of rotation of thearmka tool slfnayingt a. oylindrical hodyuengageable with said a side faces, a eap engageablewith'said cylindrioal A said arm is providegi'with ian erid groove having body to p ress the latter against said side faces, means threadedly related to said arrnfor clamping the oap against said] oylin drical body, said groove extending transversely of the axis'of rotation of said arm, said: aim being provided with anopening having its axis paralleling the longitudinal axis of said. groove,1and a. tool locatinghood having-apin guidably r'eceiyable in said WROBERTQIQ-I'MCQUILLAN.

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