US2396281A

US2396281A - Machine tool

Info

Publication number: US2396281A
Application number: US509172A
Authority: US
Inventors: Le Isle D Noble; Jr Arthur H Stanton; John G Jergens
Original assignee: Individual
Current assignee: Individual
Priority date: 1943-11-06
Filing date: 1943-11-06
Publication date: 1946-03-12
Anticipated expiration: 1963-03-12

Description

4 sheets-sheet 1 LE ISLE D. kNCBLE E T AL MACHINE TOOL Filed Nov. 6, 1943 March 12, 1946.

March 12, 1946. E .Q E D', NOBLE ETL ,2,396,281

MACHINE TOOL Filed Nov. 6, 1943 4 4 Sheets-Sheet 2 Arme/vers March 12,1946. LE ISLE D. NoBLEjE-*r Al. 2,396,281

MACHINE TooL Filed Nov, 6, 194s 4 sheets-sheet s l Arwen/sys March 1.2, 1946. LEISLE D. NOBLE ETAL 2,396,281

Filed Nov. 6, 1943 4 Sheets-Sheet 4 WMU' . j ulink l Ande/Veys Patented Mar. l2, 1946 UNITED STATES PATENT OFFICE MACHINE TOOL Le VIsle D. Noble, Maple Heights, Arthur H. Stanton, Jr., Shaker Heights, and John G.

Jergens, Warrensville Heights, Ohio;

said

6 Claims.

The invention relates to improvements in machine tools, and is particularly illustrated in the accompanying drawings and described inthe following description as embodied in a radius grinding machine.

The objects of the invention are to provide a machine of the character described which may be readily and easily assembled from its component parts, which shall have a wide range of adjustments, and which may be easily and effectively manipulated to produce a closely accurate operation on the work. Y

In the application of the principle of the `invention to a radius grinding machine, the entire table supporting the work is oscillated upon a central vertical pivot to pass the work mounted on a horizontal axis in a horizontal arc against the eiective surface of the grinding tool which is mounted upon a vertical axis, the grinding surface of the grinding tool being spaced from the oscillatory axis of the work table, during the grinding operation, a distance equal to the radius of the arc being formed on the work.

The annexed drawings and the following description set forth in detail certain means illustrating the improved machine tool, `such means constituting, however, only one of the various forms in which the principle of the invention may be embodied.

In said annexed drawings:

Figure 1 is a side elevation of a radius grinding machine in which the improvements of the invention are embodied, the view being partially in central longitudinal Vertical section;

Figure 2 is a side elevation, partially in vertical axial section, and upon an enlarged scale, of certain elements constituting a feed control mechanism shown at the left-hand end of Figure l;

Figure 3 is a front elevation, partially in transverse section, taken from the left-hand end of Figure 1;- Y

Figure 4 is a plan section, taken from the planes indicated by the line 4 4, Figure 1;

Figure 5 is a fragmentary plan section, taken from the planes indicated by the line 5 5, Figure 1;

Figure 6 is a partial side elevation, upon an enlarged scale, particularly showing the relative positions of the work and the grinding wheel detached from the machine, the relative position of a certain work-tooth supporting blade being also indicated; and Y Y Figure '7 is a partial plan section, taken from the planes indicated by the line 1 1, Figure 6.

Referring to the annexed drawings in which the same parts are indicated by the same several numbers in the respective views, the main parts of the improved radius grinding machine consist of a base I, a work table support casting l0 longitudinally and transversely adjustable of the base I, and bolted in adjusted position thereon, a table 25 mounted to oscillate in a horizontal plane around the axis A of a main pivot pin 50 upwardly extended into the table 25 from the casting l), the table 25 having an upper sliding surface, a slide I5 having a lower slide surface whereby it can be longitudinally adjusted relatively to the table 25 and an upper slide surface upon which mai7 be transversely adjusted an upper slide da forming a base for Work standards I2, the latter and the slide 40 also being formed with sliding surfaces whereby the standards I2 can be transversely adjusted on the upper slide IIB, the work 'I shown as a milling cutter being centrally mounted on a horizontal axis in the work standards I2. Other important parts of the improved radius grinding machine include a motor 5 for driving the grinding wheel 35, a tubular motor postl 8 mounted in the base I, a cutter tooth blade support 88 longitudinally adjustably mounted on the upper slide 40 and also adjustable in an arc about a vertical axis, and a screw engaging the slide I5 and serving for longitudinal feeding of the latter and all parts thereabove relatively to the grinding wheel 35. v

As stated, the table 25 and the parts supported thereby oscillate in a horizontal plane around the vertical axis A of the main pivot pin 58 and the abrading surface of the grinding wheel 35 and the cutting edge of the tooth of the milling cutter I being ground thereby, are substantially parallel to and spaced from the axis A of this main pivot pin 5l] during the grinding operation, the spacing distance being equal to the radius r of the curve 'i2 being formed on the cutter 1, as clearly indicated in Figures 6 and 7, this position being perfect, within working conditions, at the termination of the grinding operal tion.

Referring now to the detail of the main parts hereinbefore mentioned and the method of their assembly, and their relative adjustments, the base I is formed with corner bolt holes 2 whereby it may be securely fastened to any permanent foundation. The casting Iil is formed with end ears II having open-ended slots I6 which accommodate T-head bolts Il, whereby the casting I0 can be releasably secured to the base I. The base I is formed inits upper surface with a central transverse T-groove 3 and a central longitudinal T-head groove 4. Seated in the casting I5 intermediate the respective ends of the latter and the transverse groove 3 are two pairs of depending bolts 22 Whose lower enlarged head portions are embedded in a pair of blocks 35 adapted to slide in the narrow portion of the T-grocve 3 or the T-groove 4 depending upon the angular position in which the casting lo is mounted upon the base I, the ears II being so located that the lower enlarged heads of the bolts I'l slide in the wide portion of the grooves 3 .and ll. The upper ends of the blocks 34 are laterally xed by radial grooves 36 formed in the bottom surface of the casting I in which the blocks 35 are seated. Therefore, the casting Il) can be both longitudinally and transversely adjusted on the base I by a sliding of the blocks 34 in the grooves 3 and il, the casting I 0 being turned 90, if necessary, for the engagement of the blocks 35 with the particular groove 3 or 4 desired.

' The base I is also formed on the longitudinal center line with a lower tubular boss E1 at the rear, which receives a reduced bottom end portion S1 of a pin 9 extended upwardly into the bottom end of the vertical tubular motor post 8 which is mounted on the boss I1 and has a shoulder 81 against which the upper end of the pin 5 abuts, the upper end of the tubular post 8 accommodating a depending pin portion 51 of a cap 5 mounted on the top of the motor po-st 8, the depending pin portion 61 abutting a shoulder 82 of the motor post 3 and being rotatably Xed in the motor post 8 by a pin 3l.

One side of the cap 6 is formed with a vertical hole 62 therethrough through which is passed a vertical screw 65 formed with a shoulder or flange 58 which engages the lower face of the cap 5 in the desired adjusted position of the screw G5, the screw 65 above the cap 5 passing through a collar 61 secured thereto by a pin 55. The upper end of the screw 65 extending above the top face of the collar 6l is formed with a squared portion to facilitate turning of the screw 55. The threaded portion of the screw 55 is passed through a threaded hole formed in one side of a motor support 56 split at its opposite side whereby by bolts 59 it may be clamped to and released from the tubular motor post 8 which it surrounds, the opposite side 561 of the clamp 55 which is adjacent the screw 65 having a plane surface which is fastened by bolts 591 to the base 2d of the motor 5. Inasmuch as the grinding wheel 35 is secured to the shaft of the motor 5, it is evident that the grinding wheel 35 can be adjusted as to height, by an adjustment of the motor 5 and split motor support 56 relative to the motor post 8.

The table 25 which is rotatably guided on the main pivot pin 50 is locked to the underlying casting I0 by a plate 55 which is secured to the bottom face of the pivot pin 50 by screws 58 and abuts the top wall of a recess 5l formed in the bottom face of the casting lil, an upper flange 54 of the pivot pin 50 being disposed in a recess 59- formed in the top surface of the table 25. The table 25 is formed in its bottom face with an annular ball race 25 and the top face of the casting I0 is formed with a complementaryy ball race 20, which races 20 and 25 accommodate balls 2l whereby the table 25 is oscillatory in a horizontal plane on the casting I!) around the pin 50 as a pivot. The upper part of the casting Ill is formed with a peripheral shoulder Il ex- 2,396,281 y .i ,c y

teriorly of the ball race 20 which ts within a shoulder 251 formed on the bottom face of the work table 25.

The top of the table 25 is formed to serve as a slide for the longitudinal adjustment of the slide I5 and all parts thereabove.. This is effected by providing longitudinal upwardly-extended side portions 35 of the table 25 with opposed inner beveled slide surfaces 38 cooperating with lower outer beveled slide surfaces 39 formed on a depending portion I51 of the slide I5, a gib 5I being provided adjacent one of the slide surfaces 38 and adjusted thereagainst by screws 53 mounted in a side portion 30 of the table 25. Secured by depending screws 44 to the sides of the upper` slide 40 are blocks 42 which are tapped to accommodate thumb screws 49 whose inner ends engage the side surfaces of the slide I5 whereby the latter can be transversely adjusted and locked in its adjusted position.

The longitudinal adjustment of the slide l5 is effected by the feed screw 6l) actuated by a ball handle QI `keyed to the outer end thereof, the inner end threaded portion 602 of the screw 55 engaging a longitudinal elongated tapped hole l52 formed in a bushing I53 seated in an opening in the slide I5 and formed with an enlarged from end portion I 54 secured ush against the front face of the slide I5 by a screw 63.

An intermediate portion of the screw 60 passes through a boss SI1 formed in an upwardly-extended front arm 3| of the table 25 and is adapted to be rotatably secured therein by a thumb screw 14. The screw 55 is formed with a flange 9i) which engages the rear surface of the boss SI1 and between the ball handle SI and the forward face of the boss 3I1 is mounted a graduated dial SI rotatable upon a plug lil having a rear ange 'II mounted in a collar 84 disposed between the front face of the boss SI1 and the rear face of the dial 8|. Secured to and rearwardly-extended from the collar 84 is an alignment pin 56 which is passed through the collar 84 and into an elongatedlongitudinal hole 55 formed in the arm 3l, thus rotatably fixing the collar 84 with reference to the table 25. An arrow is impressed in the collar 8f! which serves as a reference mark for the graduations on the dial 8l. The dial 8l is secured at the front by a knurled nut 83 engaging a front end threaded portion of the plug l0. The ball handle SI is keyed to the screw 5E! and is mounted between the threaded portion of the plug lil and a washer 92 surrounding the screw 6U by a nut 93 also engaging a threaded portion of the screw 65. It is evident that a loosening of the thumb screw 'l5 will permit longitudinal feeding by means of the screw 59 of the slide I5 and all parts thereabove relative to ther table 25.

The upper slide 4) and the parts thereabove are transversely adjustable relatively to the underlying slide I5 and the parts therebelow. This adjustment is effected by beveled outer surface front and rear slideways 46 formed upon a downwardly-extended portion 45 of the upper slide ill which cooperate with inner surface opposed slideways 4I formed upon the slide I5, a gib 52 being interposed between one pair of slideways 56 and 4I and adapted to be adjusted against the slideway 45 by screws 41 threaded in the slide I5.

The laterally-opposed work-supporting standards I2 are secured to the upper slide 40 by T-bolts 54 which have depending enlarged heads engaging the lower enlarged portion of a transverse T-slot 'I6Y formed adjacent the top of the ases-,eer

upper slide 40. Thus the work standards I2 can be adjusted transversely of the upper slide 40 and all parts therebelow. Theseq standards I2 are of angular formation and it is through bottom hori'ontal portions I9 thereof that the bolts 54 are passed, the upper vertical portions 23 of the standards l2 being spaced and o-pposed and providing an area within which the work 1 may be rotatably mounted. This mounting is effected on an intermediate journal portion 43 of a pin 32 one end lill of which is released seated in one of the members 23 by a set screw |02, a flanged portion $1 of the pin 32 being interposed between said member 23 and the journal portion 43 upon which the work 1 freely turns, an opposite reduced end portion I() of the pin 32 being seated in a plug 98 mounted in the opposite member 23, said plug 98 having an inner end flange 99 mounted between said last-mentioned member 23 and the adjacent face of the intermediate journal portion A3. It is evident that both standards I2 as a whole may be adjusted transverselir of the machine and that the two Vstandards I2 may be relatively laterally spaced to accommodate the thickness of the hub 11 of the work 1 mounted on the journal portion 43 of the pin 32.

The work 'i herein shown is a milling cutter, and the teeth I3 thereof are supported by the blade support 83 mounted on the upper slide A0. This mounting is eiected on a rearwardly-extended upper portion 11 of the upper slide 40 by means of an angular post 15 longitudinally adjustably mounted in any desired one of several parallel transversely spaced T-slots 18 formed in the top face of the upper slide llIJ and adapted to receive in bottom enlarged portions thereof the lower enlarged heads of abolt 85 passed through' the post 15, an upwardly-extended portion 80 of the post 15 having a vertical cylindrical recess 19 within which is adjustably mounted by screw 94 an lupwardly-extended post 81 in the upper end of which in turn is mounted the blade support 88. The bottom base portion of the angular post 15 which receives the bolt 85 can be disposed at an angle to the axes of the slots 13 so that by swinging the same on the axis of the bolt 85 considerable latitude is given to the position oi the blade support 83, even in one position of the bolt 85. Therefore, this swinging adjustment and the multiplicity of slots 18, together with the longitudinal adjustment therein of the angular post 15, permits adjustment of the blade support 8B to a great number of positions.

A lubricating tting 21 is mounted in the table 25 to service the ball races 20 and 20, and a lubricating tting 33 is mounted in the boss SI1 to lubricate the bearing for the screw 60 in the boss 3I1.

Referring particularly to Figures 6 and '7, attention is directed to the fact that the oscillatory axis A of the table 25 is vertical and is spaced a distance equal to the radius 1 from that portion of the periphery of the grinding wheel 35 which is in grinding engagement with a tooth I8 on the work 1. This oscillatory axis A is also substantially parallel with the outermost surface portion of the tooth after it is ground and while it is in the grinding position shown in Figure 6. The radius grind is effected by the oscillating of the table 25 about the pivot pin 50 which swings the work 1, 90 in the direction indicated by the arrow 95, to the position shown in dot and dash lines at 12 in Figure 7, to produce the arc 12 ground on one side of the tooth. The center 121 of the desired curve 12 is longitudinally aligned with and forwardly spaced from the axis A at the beginning of the operation.

The extent land amplitude of the oscillation of the table 25 which, as mentioned, is 90 for the operation described herein, is determined by certain adjustable stops which are provided for this purpose. These stops are shown in Figures 3, 4, and 5 as set for eecting the radius grind l2 shown in Figure 6 and are comprised of the following elements: formed with a nose portion 23 which to determine the oscillatory swing of the table 25 engages blocks I3 secured to the casting I0 by spaced bolts Ill mounted in an arcuate T-slot 29 formed in the casting I0.

Successive grinding operations 12 are effected upon one side of each of the teeth I3 successively, by manually indexing the work, one tooth at a time, against the support 83 while the plane of the work 1 is parallel to the adjacent periphery of the grinding wheel, and oscillating the work 1 through its angle of 90.

Thereupon the work 1 is progressively fed toward the grinding wheel and each tooth I8 is successively ground until the center 121 is coincident with the axis A in which position the grind 12, having the desired radius r, will be produced on the tooth.

Then, if desired, radius grinds 13 may be effected successively upon the opposite sides of the teeth I8, as suggested in dot and dash lines in Figure 7. In order to produce such grinds 13 on the opposite side of the work teeth I8 it is necessary to retractl the work from the periphery of the grinding wheel 35 by turning the screw 60 in a suitable direction and it is further necessary to shift the work laterally 'by a suitable manipulation of the screws 49 until the center 131 of the desired curve 13 is longitudinally aligned with and forwardly spaced from the axis A. The work 'I is then oscillated in a 90 arc in the direction indicated by the arrow 96, Figure 7. The work 1 is then manually indexed, one tooth IS at a time, against; the support 88, while the plane of the work is parallel to the adjacent periphery of the grinding wheel and, after each indexing, the work is oscillated through its angle of This indexing and oscillating operation is repeated until each tooth I8 has been ground at least once by the wheel 35. Thereupon the Work I is progressively fed toward the grinding wheel and each tooth I8 is successively ground until the center 13l is coincident with the axis A in which position the grind 13 having the desired radius r will be produced on the tooth.

The production of the grind 13 necessitates the `re-setting of the respective blocks I3 in the T-slot 29 to positions on the opposite sides of the machine from the positions occupied by these blocks I3 when the grind 12 was produced, as will be understood.

What we claim is:

l. A radius grinding machine comprising. a base, a work-table mounted thereon for turning movement in a horizontal plane, a slide adjustable on the table in one direction and a second slide adjustable on the mst-mentioned slide in a relatively right ang-ular direction, feed-control mechanism for adjusting the first-mentioned slide in said one direction, a work-standard erected on the second slide and adjustable thereon, means for mounting work on a horizontal axis in the Work-standard, a motor vertically adjustably mounted on the base, and a grinding wheel supported by and rotatable by the motor and The rear end of the table 25 ismounted to turn on a vertical axis with its peripheral grinding surface spaced a horizontal distance from vertical alignment with the turning axis of the work-table equal to the radius of the designed operation upon the Work.

2. A radius grinding machine comprising a base, a, work-table adjustably mounted thereon and also mounted for turning movement on an axis angularly related to the plane of adjustment, a

slide adjustable on the table in one direction and a cross Slide adjustable on the first-mentioned slide, feed-control mechanism for the rst-mentioned slide, a. Work-standard mounted on the second slide and comprising two spaced laterallyopposed relatively adjustable members, the second slide being formed with T-slots, and T-bolts depending from said members and engaging the slots, means for mounting work in the workstandard comprising a pin having an intermediate journal portion, a plug mounted in one member and adjustably receiving one end of the pin, and means mounted in the other member and releasably retaining the opposite end of the pin, a motor, and an adjustable grinding wheel rotatable by the motor.

3. A radius grinding machine comprising a base, a Work-table mounted thereon for oscillatory movements in a horizontal plane, adjustable means limiting the extent of such oscillatory movements, a slide adjustable on the table in one direction and a second slide adjustable on the first-mentioned slide in a relatively right angular' direction, feed-control mechanism for adjusting the first-mentioned slide in said one direction, a work-standard erected on the second slide and adjustable thereon, means for mounting Work on a horizontal axis in the Work-standard, a motor vertically adjustably mounted on the base, and a grinding wheel supported by and rotatable by the motor and mounted to turn on a vertically axis with its peripheral grinding surface spaced a horizontal distance from vertical alignment with the oscillatory axis of the Work-table equal to the radius of the designed operation upon the Work.

4. A radius grinding machine comprising a base, a. Work-table mounted thereon for oscillatory movements in a horizontal plane, adjustable means limiting the extent of such oscillatory movements, a slide adjustable on the table in one direction and a second slide adjustable on the ilrst-mentioned slide in a relatively right angular direction, feed-control mechanism for adjusting the first-mentioned slide in said one direction, a Work-standard erected on the second slide and adjustable thereon, means for mounting Work on a horizontal axis in the work-standard, a tooth support blade adjustably mounted on the second slide, a motor post erected on the base, a motor vertically adjustably supported by the post, and a grinding wheel supported by and rotatable by the motor and mounted to turn on a vertical axis with its peripheral grinding surface spaced a horizontal distance from vertical alignment with the oscillatory axis of the work-table equal to the radius-of the designed operation upon the Work.

5. A radius grinding machine characterized as in claim 4 in which the Work-table is mounted on a sub-table casting for oscillatory movements thereon, and the casting is releasably fastened to the base and the casting and base are formed for adjustments of the former upon the latter.

6. A machine tool comprising a base, a Worktable pivotally mounted on the base and also adjustable thereon in a plane at right angles to the plane of the pivotal axis, a Work-holder mounted on the table and adjustable thereon in relatively right angular directions, means providing for the adjustment of the Work-holder for the accommodation of work of varying characters, a grinding wheel and means for rotating it, means for adjusting the grinding wheel in a direction parallel to the pivotal axis of the Work-table, and a support .blade mounted on the table and angularly and rectilinearly adjustable relative to the work-standard.

LE ISLE D. NOBLE. ARTHUR H. STANTON, JR. JOHN G. JERGENS.