Improvements in or relating to Lathes.
116,174. Drummond, A. June 26, 1917. Disk apparatus.-Consists in a lathe or grinding- machine in which the work is carried between centres in a cylindrical or semi-cylindrical body, which is traversed by a lead-screw in a corresponding casing forming a part of the machine framing so that the work is carried past a fixed tool or grinding disk or wheel mounted in a cross-slide on the machine framing, the cylindrical body and casing being gapped in front to accommodate the tool and allow of the introduction of the work. Fig. 1 shows a lathe, in which the body B is cylindrical and is traversed in the corresponding casing A, both being open in front at b<1>. The mandrel C is rotated by worm gear and has at its rear end a lead-screw E working in a nut F, which may be fixed or may be capable of slight rotary movement to compensate for known defects in the screw. Fig. 5 shows a cross-section of the machine, in which the body B is semi-cylindrical and is secured by front-plates K moving with a slight clearance k<1> on guide flanges a<6> on the casing and held by bars k<4> at the top secured by bolts and springs k<2>. As shown in Fig. 1, a fixed tool d is carried in a cross-slide provided with micrometer adjustment, but in place of the fixed tool a grinding wheel or disk may be mounted, driven by any convenient means. The machines are shown as driven by automatic-stop reversing-gear.