GB832533A - Improvements in grinding and like machines - Google Patents

Abstract

832,533. Grinding. RUDKIN & RIPLEY Ltd., and TARRY, F. H. April 2, 1958 [Jan. 3, 1957], No. 302/57. Class 60. A machine for grinding or finishing internal or external surfaces on a circular workpiece comprises means for effecting relative longitudinal traverse back and forth in a straight line between a work-holding headstock 3 and a unit 17 equipped with a rotary grinding or finishing tool spindle 22, means permitting relative movement between the spindle and the headstock transversely of the straight line, and follower means 36, which is associated with either the spindle or the headstock and arranged for cooperation with a form plate 52 on a fixed support 45 so as to effect and control relative transverse movement between the spindle and headstock during the relative longitudinal movement therebetween. The workpiece is held in a chuck 6 belt-driven from an electric motor 8 which is mounted on the headstock 3 adjustable transversely of the bed 1 of the machine by a handwheel 4. The unit 17 is mounted on a carriage 12 reciprocable by a reversible electric motor, hydraulic device, or by a handwheel 13 along longitudinal guideways on the machine bed 1 and consists of a swivel plate 16 mounted on anti-friction bearings on a platform 15. The tool spindle 22, which is provided with a collet to hold a grinding, lapping or other finishing tool, is mounted in an axially-adjustable sleeve 20, which is either in the form of a bearing or provided with anti-friction bearings and clampable by a handle 21 in a housing 19 on the plate 16. The spindle is belt-driven from an electric motor 29 mounted on a carrier 28 from which depend legs 27 engaging tubular supports on the plate 16 ; springs 34 around the legs may be adjusted to effect the necessary tension of the belt-drive. A bar 35 extends from the plate 16 and has a plurality of holes 48 to receive either a follower 36 or 37, which may be in the form of a pin or roller, arranged to co-operate with a form plate 51 or 52, respectively, secured by bolts 47 to a platform 44 mounted on a bracket 45 fixed to the machine base. The position of the follower along the bar and the form plate on the platform determines the ratio between the size of the form plate and the shape to be ground on the workpiece. Plate 51 may have its edge 51a shaped to the desired configuration to be ground on the workpiece and plate 52 have a plurality of concentric grooves of different radii formed on its surface, any one of which may be engaged by the follower 37 to form a curve of desired radius on the workpiece. Lugs 43 depend from the bar 35 to support it over the platform and a spring 58 urges the bar against an adjustable stop 55 or the follower against the form plate. In an alternative arrangement, the platform is longitudinally adjustable on the bracket and the bar slotted to provide an infinite adjustment of the follower. In operation, the length of back and forth movement of the carriage is set by a handle 61 and the transverse position of the headstock set by the handwheel 4. During longitudinal movement of the carriage, a cylindrical form is ground on the workpiece while the bar 35 abuts the stop 55 until the unit 17 is swivelled by engagement of the follower with the form plate. If desired, the workpiece may be carried by the unit 17 and the grinding or finishing tool by the headstock 3.