A first-class, comprehensive data pack for the Chipmaster and Kopp variator covering all years of production can be bought online here Belts are also available; please email for details
Early Chipmasters had a drive to the Matrix clutch by three V-belts and to the screwcutting and feeds gearbox by both gear and V belt. In this publicity picture the V-belt drive from variator to Matrix clutch has been air-brushed out.
Chipmaster (and Bantam) apron
Chipmaster Screwcutting Gearbox. Lathes with English threading used a different gearbox to those fitted with Metric screwcutting (below); the English box can be recognised by its sliding lever control (as above) the metric box was the same unit as used on the Bantam and had a joy-stick selector (see below). Some "all-metric" Chipmaster lathes carried the identification "Continental". Both the English and metric gearbox could generate, with appropriate translation changewheels, the other type of thread.
Chipmaster "Continental" metric screwcutting gearbox with joy-stick control of a type as also used on the Bantam model
Chipmaster screwcutting gearbox internals
The 15/16" (35 mm) bore headstock spindle ran in Gamet "micro-precision" taper roller bearings (made by anther company in the Colchester group) with the lower part of the speed range obtained through hardened and ground gears. Because the high-speed range was direct by belt, and the comparatively short and rigid spindle so well supported, the lathe had a reputation for being able to produce unusually smooth surface finishes. An American-type D1-3" Camlock nose fitting was used that allowed the lathe spindle to be safely reversed at high speed. Note the toothed pulley, fitted to a spline on the pulley and used to drive the spindle directly on the high speed range.