I'm trying to get a Holbrook C10 running on a 3.7kW Transwave converter;
has anyone managed to get multi speed motors working OK on a converter?
The C10 has a 3 speed (2860, 1430 and 925 RPM) 2HP motor that drives a 2
speed clutch/gearbox assy; with backgear this gives 12 spindle speeds.
Without a pilot motor it's difficult to find a switch setting on the
converter that will run the motor at sensible voltages at all 3 speeds
and when the fast clutch is engaged at 2860 the motor slows
significantly and won't come back up to speed - after a few seconds the
motor protection trips.
With a pilot motor (5HP 2800RPM) the voltages are more sensible at the 3
motor speeds but the lathe still won't run at the highest spindle speed
These tests were done without a chuck mounted so the problem may occur
at other speeds with the extra inertia to be overcome.
15 years ago