GB797282A - An internal gear finishing machine - Google Patents

Abstract

797,282. Gear - finishing. NATIONAL BROACH & MACHINE CO. April 26, 1955 [June 14, 1954], No. 11972/55. Class 83 (3). A gear-finishing machine comprises a work-spindle 24 which is rotatably driven on a support 22 adjustable about a horizontal-axis at right-angles to the axis of the cutter C. The work W is mounted on a shaft 24 rotated through change-gears and worm-gearing by a motor 26, the drive-shaft 112 extending through a hollow-pivot, about which the work-head 22 is angularly adjustable. The adjustment is made, through worm-gearing and a shaft 84 against a scale S, to enable tapered-gears to be shaved or to tilt the head for insertion of a workpiece mounted on a relatively long shaft. The cutter-head is mounted on a slide 156 which can be advanced, by toggle-means 166, 170 and a handle 176, to a working position determined by an adjustable block 17,8 engaging a wedge-block 177 on the slide. The slide 156 moves on a slide 148 which is advanced, on a vertically-adjustable knee 18, by a screw 144 rotated through a shaft 140 to effect one or more complete reciprocations, with vertical adjustment under the control of dogs 152. The screw 36 for vertically-adjusting the knee 18 may be rotated by a hand wheel 40, or be intermittently fed by means as described in Specification 725,627. Alternatively it may be fed in a continuous movement, without reciprocation of the cutter, to effect a plunge-cut. The cutter C can be turned by a hand wheel 234 to position it as the slide 156 is advanced by the lever 176. It is adjusted axially by a screw 220 and angularly about the centre-point of the cutter by a shaft 194 carrying a worm 196 engaging a segment 200 on an angularly-adjustable slide 182. The adjustment is indicated by a scale or measured accurately by gauges placed between blocks 204, 206 on the. slide 156 and a block 208 depending from the slide 182. Coolant is supplied to the cutting- zone by a motor 46. In a modification, the work-head is moved angularly about its hollowpivot, to and from working position, by a fluid-pressure device and a toggle-linkage. In a further modification, the cutter is rotated instead of the work.