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Colchester Triumph 2000 Lathe - Page 2
Clausing 15" Models 8030, 8031, 8032, 8033
Apron, Carriage & Gearbox
Triumph 2000/2500 Home Page   
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The apron was doubled walled, with its shafts supported on ball bearing at each end and all the gears hardened and ground; the base was closed off to form an oil bath to splash lubricate the internals and at the top of the front face, just to the right of cross-feed screw, was a push rod for the hand-operated plunger pump that fed lubricant from the same supply to the bed, cross-slide ways and cross-feed nut.

The Compound slide rest was machined all over and fitted with taper gib strips that allowed a very precise fit to be obtained whilst giving far superior support in comparison with the cheaper "loose-strip" type. The cross slide was especially wide and fitted with a cross-feed screw that could be adjusted to reduce backlash. Unfortunately, it was devoid of T slots, or even tapped holes, that might have been used to hold a parting-off or other special tool; however, the slide was of a sufficient thickness to allow a hydraulic profiling attachment to be mounted on it and so the possibility existed for an owner to safely make his own tapped holes to mount anything he thought necessary.

The dual Metric/English screwcutting gearbox was totally enclosed, lubricated from an oil bath and fitted with hardened and ground gears running on ball-race supported shafts. Three conventional levers, and a 6-position joystick that moved into radial slots around a circle, swapped the ratios. The box was able to generate a wide range of pitches without dismounting or changing any of the changewheels; the range of threads comprised: 39 Metric from 0.2mm to 14.0mm; 18 Module from 0.3 to 3.5m; 45 English from 2 to 72 t.p.i. and 21 Diametral from 8 to 44 D.P.  The range of sliding feeds varied from 0.001" to 0.040" (0.03mm to 1.0mm) and surfacing feeds at half those rates (and thus) from 0.0005" to 0.020" (0.015mm  to 0.5mm) - all per revolution of the spindle.