Patent GB-975310-A (GB)
Title: Grinding machine truing compensation mechanism
IPC: B24B49/18
Filed: 1963-11-08
Abstract: 975,310. Grinding. CINCINNATI MILLING MACHINE CO. Nov. 8, 1963 [April 2, 1963], No. 44125/63. Heading B3D. A grinding machine comprises a workpiece support member 13, a grinding-wheel support member 26, and a trueing tool support member 46, a compensating actuator 40 being mounted on one 26 of the members for movement relative thereto along a path and in camming relation to the other two of said members to relate relative movement between the three members, two, 26, 46 of the members being movable relative to the third member in response to movement of the actuator to effect relative movement between the grinding wheel support member 26 and the workpiece support member 13 and between the trueing tool support member and the grinding- wheel support member. The grinding-wheel 25 is driven by a belt 27 from a motor 28 and mounted in the support member 26 which, in turn, is mounted for pivotal movement about a shaft 29 secured in a base 10 of the machine, the base supporting a slide 11 having a support member 13 provided with a pair of shoes 15 for a workpiece 16 rotated by a magnetic drive plate in a headstock 17. A feed lever 30 is at one end pivotally mounted on the shaft 29, and at the other end provided with a roller 31 bearing on the upper end of a cylinder 34 vertically movable by hydraulic fluid supplied above or below a piston 37 secured to the base 10. A pair of rollers 41b are mounted intermediate the ends of the lever 30 and bear on a cam-plate 71 secured to the compensating actuator 40, the actuator bearing by way of balls 43 against the under-surface of the grinding-wheel support member 26 so that pivotal movement of the lever 30 as a result of hydraulic fluid supplied to the cylinder 34 causes the member 26 to rock about the shaft to provide a feed and withdraw movement of the grinding-wheel towards and away from the workpiece, the hydraulic supply being such as to cause a rapid and then slow feed of the grinding-wheel. The actuator 40 has a second plate 62 engaged by a pair of rollers 61b on one end of a lever 60, the other end of which is clamped to a hollow shaft 45 mounted in the grinding wheel support member 26. The trueing tool support member 46 is carried on the end of the hollow shaft 45 and supports a carrier 53 for a diamond pointed trueing tool 54, the carrier being rotatable about an axis E to swing the tool in an arc to dress an arcuate profile on the grinding-wheel by bevel gearing connected to a driven shaft 48 disposed within the hollow shaft. The actuator 40 is connected to a member 20 in threaded engagement with a screw 66 driven by gearing 67 from a motor 65 mounted in the support member 26. In operation, when trueing of the grinding-wheel is required after one or more grinding operations effected by hydraulic fluid supplied to the cylinder 34 rocking the lever 30 and hence the grinding- wheel support member about the shaft 29, the step electric motor 65 is actuated to rotate the screw 66 and move the actuator an increment so that the plate 71 moves relative to rollers 41b to swing the wheel head relative to the base 10 through an angle α and the plate 62 moves relative to the rollers 61b to swing the trueing support relative to the grinding support member 26 through an angle # so that the trueing tool moves a distance twice that of the grinding- wheel to compensate for the movement of the grinding-wheel and the reduction in diameter of the wheel as a result of the trueing operation.