Patent GB-125503-A (GB)
Title: Improvements in or relating to Grinding Machines.
Inventor: POLLAK JUSTIN ERWIN
IPC: B24B3/02
Filed: 1918-04-16
Abstract: 125,503. Pollak, J. E., (Toronto Type Foundry Co.). April 16, 1918. Disk apparatus.-Relates to machines of the kind described in Specification 111,972 for grinding milling-cutters, lathe tools, drills, &c. The grinding-disk 45 and an electric motor for driving it are mounted by means of a turntable 42, Figs. 6 and 7, on a slide 36 fitted in another turntable 34 mounted on a member 31, which is pivoted at 33 to the pillar 2, Fig. 1, so that it may be turned. in a vertical plane. The slide 36 may be moved to and fro by means of a hand-lever 39. In an alternative construction, the member 31 is fitted on the top of the pillar by means of a ball-andsocket joint. The work supports, shown as a pair of headstocks 24, are mounted on a bed 22 angularly adjustable in the horizontal plane on a slide 16, that is fitted on a cross-slide 13 and carries a rack engaging a skew-gear wheel 19 on the end of an inclined spindle provided with a hand-wheel. A pulley on one of the headstocks may be driven by an electric motor secured to the edge of the bed. The cross-slide 13 is mounted in guideways on the upper face of a bracket 3 that is supported on the pillar 2 by means of its sleeve 4. The sleeve is split and provided with a clamping-screw, whereby it may be secured in any desired angular position in the horizontal plane. Means, however, are provided to enable the bracket to be moved up and down in a fixed vertical plane when desired; these comprise a key 8 fitted in the bore of the sleeve and connected to an eccentric 10, the rotation of which projects the key into a keyway in the pillar, or draws it entirely into the groove in the sleeve. The bracket is movable vertically by a compound screw 58, 59, the nut 64 of which is turned by bevel gear and a handwheel; the shoe 60 at the foot of the screw 58 fits against the flange of the pillar and carries a roller 62 resting on the upper face thereof. The movement of the slide 36 carrying the grinding-head may be controlled by a former; preferably this is effected with the turntable 31 turned about its pivot 33 into a vertical position so that the slide tends to move downwards under the action of gravity. A lever pivoted on a bracket on the turntable is coupled at one end to the slide 36, while at its opposite end is carries a globular roller that engages the lower face of a former bar fixed to the bed 22. For use in grinding milling-cutters, a tooth rest, Fig. 11, is employed; this comprises a base 50, adjustably clamped on the bed 22 and formed with a vertical socket 50<a> and an horizontal socket 50<b>, a bar 49 which may be secured in either socket, and a stem 54 adapted to engage the teeth. The two parts 49, 54 are adjustably clamped together by a device consisting of three disks 52, 53, 55 and a clamping-screw 56, Fig. 8. The disks 52, 53 are formed with holes to receive the rods 49, 54 respectively; the holes open out into the faces of the disks so as to expose the sides of the rods to the disk 55, the faces of which are roughened. For the purpose of clamping the turntable 42 on the slide 36, the slide is formed with a circular boss 47, Fig. 7, and the turntable with an opening of larger diameter; a split ring 70 is placed in the space between the boss and the opening; at one end the ring is anchored to the turntable, while at the other it is adjustable by means of a set-screw in order that it may be caused to grip the boss on the slide.