Many thanks for the information, I'll certainly look into a VFD.
I almost bought a motor today but the shaft diameter was too big so you saved me from a possible (costly) error.

Can anybody tell me the RPM of the 3 phase motor on the Viceroy 250 TDS/3/C/M/L.

I want to convert to a single phase motor but cannot do so until I find out the RPM required.

I've looked all over the lathe and motor - no sign of any plate giving the info.