GB461915A - Improvements in or relating to lathes or similar machine tools - Google Patents

Abstract

461,915. Lathes. DRUMMOND, A. Oct. 12, 1935, Nos. 28227 and 28744. [Class 83 (iii)] An automatic lathe or like machine tool particularly for machining heavy work pieces has a headstock arranged vertically above the tailstock while the longitudinal and transverse movements of the tool are both actuated from a vertical cam drum. The foot casting 1 which receives the chips falling from the tools is connected by a vertical bed 2 to an upper casting 3 which carries a motor 4 connected by gearing 5..9 to the two spindles 10, 11 of headstocks 12, 13 which are mounted above their corresponding tailstocks 26 on guideways 14 of the bed. The tailstock centres are advanced by hydraulic pressure controlled from pedals 28. Each unit is associated with a pair of vertical parallel bars 17 and tool carriages 18 are held against axial movement relative to the bars but may be swung on the bars to feed tools 21 into the work W by means of longitudinal cams 24 mounted on slidable members 24A. The bars 17 are all moved axially to traverse the tools along the work by means of cams 34 on a single vertical cam drum 35 driven from the main motor. The cam followers 33 are mounted on bars 32 each connected by pivoted levers 30, Fig. 4, and links 29, 31 to one of the bars 17. The longitudinal cams 24 which impart depth movement to the tools are similarly actuated from the cam drum through flat vertical bars and pivoted levers. In operation a heavy work piece may be rested on the tail centre which is then advanced by the hydraulic gearing while the operator guides the upper end of the work on to the head centre. The cams may be different for each spindle unit so that one unit may perform roughing and the other finishing operations. The parts may be enclosed by a cover 40 having inspection doors 41 which may be pushed aside after a main door has been opened by a handle 43.