The surface of the bed ways is supersonic frequency hardened and precision ground with a long service life. The design of the main drive is optimized and the gears in the headstock are precision ground. The noise of the machine is low and its sound is pleasing to hear. The spindle bore size is 80mm.The spindle system is high in rigidity and accuracy. There is no vibration when turning with a cutting depth of 10mm. There is no need for change gears. The machine can turn about 200 kinds of metric, whitworth, module and D.P. Threads including special whitworth threads such as 7-1/2,9-1/2,10-1/2,11 11-1/2,13 13-1/2,19,27t.p.i.and pipe threads An automatic stopping device is used to realize automatic stop for the machining of a certain length workpiece, which is safe and reliable. The main drive adopts Japanese HONDA motorcycle braking device which stops the machine quickly and effectively. Items Model C6236ZX C6240ZX C6246ZX Max. Swing diameter Over bed mm 360(14") 410(16") 460(18") Over carriage mm 200(7-2/3") 250(10") 290(10-4/5") In gap mm 600(23-5/8") 660(26") 700(27-1/2") Max. Length of workpiece mm 1000(40") 1500(60") 1000(40") 1500(60") 2000(80") 1000(40") 1500(60") 2000(80") Effective gap length mm 200(8") Spindle Spindle bore mm 80(3-1/8") Taper of bore 　 M.T.No.7 Number of speeds 　 12 Range of speeds r.p.m 42-1800 or 25-1800 42-1800 or 25-1800 42-1800 Thread cutting 　 Metric Range/No Inch Range/No Module Range/No D.P. Range/No 0.5～20mm/28 72～1-5/8t.p.i/65 96～3-1/4DP/45 0.25～10mm/24 Range of feeds Longitudinal mm 0.041-2.476 (0.0015"-0.0913") Cross mm 0.016-0.991 (0.0006"-0.0365") Tailstock sleeve External diameter mm 75(3") Taper of bore 　 M.T.No.5 M.T.No.4 M.T.No.4 Max. Travel mm 130(5") Max. travel of compound rest mm 100(4") Max. cross slide travel mm 230(9") Max. size of tool shank (W×H) mm 25×25(1"×1") Power of main motor kW 5.5