GB748620A - Improvements in or relating to lathes - Google Patents

Abstract

748,620. Combined lathes and boring machines; lathe details. PFEIFER, H., and PFEIFER, E. Sept. 10, 1953, No. 25122/53. Class 83 (3). A hollow cutter-head 1, Figs. 1 and 4, is fixed to a lathe-spindle A for turning bar or tube-stock F clamped in a block I fixed to the saddle E fed towards the head against an adjustable stop Q. The head contains tools 11, 15 which rough and finish turn, respectively, the outer diameter, and a boring tool 5 which turns the inner diameter. Tools 11, 15 are adjustable radially and axially of the head and tool 5 is adjustable radially only. After abutting the stop Q, the saddle is returned, e.g. by a spring, to abut a stop P and the work is parted-off by a tool 13. This tool is clamped to an arm 6 attached to one end of a rod 7 extending through a bore in the head and having fixed at its other end a lever 27. A peg 28, Fig. 3, on the lever engages a cam-slot 37 in a ring 3 capable of rotating relatively to the head 1. A similar lever 26 mounted on rod 30 and having peg 29 in cam slot 38 is diametrically opposed to lever 27. To move the parting tool, a lever C is turned to cause a brake H to contact a groove 3a of the ring 3, thus causing it to turn relatively to head 1, with the result that the pegs 28, 29 move towards the outer ends O of the slots and turn the levers 26, 27. Thus tool 13 moves towards the centre of head 1 to part the work. An end facing tool on an arm may be fixed to rod 30 to be operated simultaneously with tool 13. On release of lever C, springs 33, 34 restore the parts to their initial position. Either arm may carry a thread-cutting tool applied to the work by lever C while a feed of appropriate pitch is performed by the saddle, the depth of thread being governed by slot 37 or 38.