I run a little Boley & Leinen (BCA) jig borer with a 0.55 kW motor on a Jaguar inverter. Parameters are normally set to run at an absolute minimum of 15Hz and a maximum of 70Hz
As an experiment I set it to run at 5Hz to see if it warmed up, it ran like that for over an hour with no issues at all, and it is almost impossible to stall it either.
I think the trick is to have a motor that is more than man enough for the job then amount of metal in the casing can keep it cool even without the effects of its fan.
I ran the Harrison lathe for a good few hours at 10Hz when turning my big flywheel, again no problems were apparent.
Phil
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