US2702970A

US2702970A - Precision means for grinder taper setup

Info

Publication number: US2702970A
Application number: US275543A
Authority: US
Inventors: Walter M Haverstick
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-03-08
Filing date: 1952-03-08
Publication date: 1955-03-01
Anticipated expiration: 1972-03-01

Description

March 1, 1955 w. M. HAVERSTICK 2,702,970

PRECISION MEANS FOR GRINDER TAPER SETUP Filed March 8. 1952 Mumunmmunulannufih? millllnllllli I/vvE/v TOQ WALTER M. HAvEpsT/cK,

Ev Mam United StatesPatetit'O 2,702,970 7 PRECISION MEANS FOR GRINDER TAPER SETUP Walter M. Haverstick, Indianapolis, Ind.

Application March 8, 1952, Serial No. 275,543 1 Claim. (Cl. 51-165) This invention relates to a structure for setting up a grinding machine to grind a precisely predetermined taper on a piece of work revolving between centers or the like. A primary object of the invention is to provlde a quick and readily usable structure for setting up a machine to grind precisely a predetermined taper, all with the minimum number of operations as well as employing the minimum amount of time, and at the same time providing an extremely high degree of accuracy in the end result.

These and many other objects and advantages of the invention, including the extreme simplicity of the structure, will become apparent to those versed in the art in the following description of one particular form of the invention as illustrated in the accompanying drawing, in which Fig. 1 is a top plan view of the foot stock end portion of a grinder to which the invention is applied; and

Fig. 2 is a fragmentary end elevation.

In the form herein shown, a slide table 10 is shown mounted to be shifted longitudinally along a V-way 11 and a flat-way 12. One end of the slide table 10 is provided with a raised surface 13 having parallel side, vertical edges 14 and 15. These edges 14 and 15 extend transversely across the right hand end of the slide table 10.

Mounted on the slide table 10 is a swivel table 16 to be swiveled about a vertical axis centrally of the slide table 10, all in a well known and usual manner. The swivel table 16 is rocked horizontally across the slide table 10 by a crank (not shown) applied to the exposed end of the shaft 17, all again in the usual and well known manner.

Mounted on the swivel table 16 is a foot stock 18 shiftable longitudinally of that table, and carrying the center 19. The swivel table 16 also carries a head stock (not shown) from which extends the center 20. Between the centers 19 and 20 is positioned the work piece 21, and a grinding wheel 22 is brought up to have a face 23 longitudinally traverse the work piece 21.

So much of the structure described is found in standard equipment and does not per se enter into the actual invention, although advantage is taken of the movements thereof.

On the tail end of the swivel table 16, there is fixed an arm 24 to extend rearwardly therefrom and to terminate over and in spaced relation above the surface 13. The arm 24 is herein shown as having the

feet

25 and 26 extending at right angles therefrom to abut the swivel table 16 and be secured thereto in any suitable manner, herein shown as by the screws 27. A stem 28 is fixed to the outer portion of the arm 24 to extend downwardly therefrom toward the table 10 and to terminate in a ball end 29 still spaced above the surface 13. The diameter of the ball 29 is greater than the diameter of the stem 28 immediately below the arm 24.

I form a slide generally designated by the numeral 30 to have an under side width equal to that of the width of the surface 13, and I provide a flange on each side of the slide 30 to extend downwardly therefrom to bear against the sides 14 and 15. These flanges are designated by the numerals 31 and 32. A close sliding fit is provided between the flanges 31 and 32 and the vertical sides 14 and 15. In this manner, the slide 30 is guided and confined to travel along the surface 13.

The slide 30 is provided with a slot 33 entering from its outer end to extend into and along the slide 30 a dis 2,702,970 Patented Mar. 1, 1955 tance, parallel to the flange 31. A clamp screw 34 extends through the slot 33 to screw-threadedly engage in the member 35 which has the top surface 13. Thus, the slide 30 may be secured in any position along the surface 13 by clamping it with the screw 34. As above indicated, the member 35 which is the member having the top surface 13 is fixed to the slide table 10 to become to all intents and purposes an integral part thereof.

The slide 30 has an upturned inner end 36, extending upwardly from the surface 13 at right angles thereto. A central portion of this flange 36 is provided with a notch 37 entering the flange 36 from its upper edge and extending downwardly to at least the top surface of the slide 30.

On the top side of the slide 30 there is mounted an indicator gage 38 to have its shiftable stem 39 extend through the slot 37 and normally terminate beyond the face 40 of the flange 36.

An equalizer bar 41 is selected to extend substantially across the entire face 40 of the flange 36 and to have a thickness such that the bar 41 is not readily bendable. Such thickness for a steel bar would be for example about three-sixteenths of an inch. When the equalizer bar 41 is rested on the surface 13, and brought up against the face 40 of the flange 36, it will push the indicator stem 39 toward the indicator 38 a distance equal to slightly less than the capacity of reading of the indicator.

The method of using the structure so far outlined is as follows. The work piece 21 is placed between the centers 19 and 20, and the Work 21 is ground to have a constant diameter, that is to be straight, wherein the axis of the two centers 19 and 20 is exactly parallel with the axis of the wheel 23. This condition, of course, may be indicated without having -to grind the work piece 21 straight. With the work 21 thus in the straight setting, which is achieved by rocking the swivel table 16 relative to the slide table 10, the slide plate 30 is brought up toward the ball 29 to have the equalizer bar 41 intervene between it and the flange 36, and the plate 30 is then adjusted by sliding it along the surface 13 to bring the indicator 38 to a zero reading with the bar 41 in contact with the ball 29. At that reading the slide is fixed by the screw 34.

Then the swivel table 16 is rocked in a horizontal direction on the slide table 10, to change the angle of the axis through the centers 19 and 20to the angle of taper required. This angle is predetermined for the desired taper. In obtaining the required setting of the swivel table 16, the arm 24 will be rocked away from the equalizer bar 41, and the distance between the ball 29 and the equalizer bar 41 will be initially gaged by using one or more Jo (Johansen) blocks 42, herein shown as two in number, the thickness of the two blocks as the case may be determining the spacing between the equalizer bar 41 and the ball 29 to give the swivel table 16 the required angle of taper. Then to get the angle precisely, the swivel table 16 is rocked back to compress the blocks 42 slightly between the ball 29 and equalizer bar 41 to bring-the bar 41 against the stem 39 so that the indicating gage 38 will be brought to read zero. Then the swivel table 16 is in the precise angle for the taper required.

Thus it is to be seen that I have provided not only an extremely simple mechanism, but also an extremely simple method for using that mechanism in order to obtain precisely the exact angle or taper required on the work piece. The setting is precise primarily through the major rocking distance of the swivel table 16 by means of the Jo blocks, and finally to the exact fractional portion of the distance by use of the indicator gage in conjunction with the 10 blocks. All of this is used from the zero position for parallel grinding.

Therefore, while I have herein shown and described my invention in that one precise form, it is obvious that structural variations may be employed without departing from the spirit of the invention, and I therefore do not desire to be limited to that precise form beyond the limitations which may be imposed by the following claim.

I claim:

In a grinding machine, the combination with a grinding wheel rotatable about a fixed axis; a base; a slide 3 table longitudinally traversable of the base in directions parallel to said axis; a swivel table mounted .on said slide table rockable about a vertical axis; and Work carrying head and foot stocks mounted on said swivel table, and an arm extending from the tail end of said swivel table; a ball carried by said arm adjacent the upper side of said slide table; the swivel table between the swivel table axis and the center of said ball constituting in effect a sine bar; a cross slide member shiftably carried by said slide table back of said swivel table; means confining said cross slide member to travel normal to the travel of said slide table; an indicator carried in fixed position on said cross slide member and having a shiftable operating stem extending therefrom directed generally toward said ball, the axis of the stem being parallel to the directions of travel of the cross slide member; an upturned flange carried by and extending cross-wise of the cross slide member on its end directed toward said ball, said flange having an opening through which said stem freely extends; an equalizer bar extending freely traversely across said cross slide member and along said flange on the ball side thereof; said cross slide member being adjustably secured to said slide table in that swivel table position of ball contact with said equalizer bar bearing against said flange and said indicatorstem with the indicator having a zero reading when the swivel table is rocked to a position having the center line of the head and tail stocks parallel to said grinding wheel axis; a gage block of thickness according to the taper angle selected inserted between said ball and said bar and resting on said slide table; and said swivel table being fixed on its slide table in that position of said ball bearing against said block in turn bearing against said flange and said stem with said indicator having said zero reading.

References Cited in the file of this patent UNITED STATES PATENTS 1,693,723 Mitchell Dec. 4, 1928 2,429,517 Knapp Oct. 21, 1947 2,600,550 Levesque June 17, 1952 FOREIGN PATENTS 15,901 Great Britain Aug. 3, 1899 n at' r