GB1169176A - Improvements in or relating to Machine Tools - Google Patents

Abstract

1,169,176. Machine tool details. AUSTIC-LAYTON MACHINE TOOLS Ltd. 20 Jan., 1967 [20 Oct., 1965], No. 44508/65. Headings B3B and B3T. A machine tool, such as a lathe, comprises a bed 1 and a headstock 2 with a rotatable tool or work holding member 3 and a U-shaped saddle member 10 mounted on co-planar slides 8, 9 for movement towards and away from the headstock, the axis of rotation of the member lying in the same plane as the saddle member slides. The saddle member may carry a vice assembly 4 which has two opposed vice jaws 19 actuable to clamp a workpiece by a screw 20 and by a pneumatic piston and cylinder (not shown) which facilitates the application of uniform pressure by the jaws on the workpiece which is supported in a cradle extending behind the vice assembly. In this arrangement the cutting tool is mounted in the rotatable tool holder 3 whereby drilling and facing operations may be carried out on the workpiece, the saddle 10 and vice assembly being moved towards and away from the toolholder 3 by known type fluid actuating means or as shown by a hand wheel 14 which operates a rack and pinion 16, 15. In an alternative embodiment the saddle has a rotatable tool-holding turret 29 mounted thereon fluid means being provided to move the turret with a preselected tool, towards the workpiece held in a chuck 28 on the headstock, at an initially rapid speed up to the workpiece and then at a predetermined feed rate during the machining operation and then with a rapid return motion to its fully retracted position. If a number of machining operations are to be performed on one workpiece by a plurality of tools on the turret, the turret is adapted to be indexed and locked by a retractable pin means as it is retracted after a preceding machine operation. The indexing of the turret is effected by a ratchet and pawl mechanism in unison with the traversing movements of the turret and the speed and check motions of the turret traverse are controlled by adjustable stops 46, 45 respectively which co-operate with respective speed and stop control valves. The cycle of operations may be effected automatically.