(02-19-2013, 07:44 AM)stevec Wrote: dallen, I'm quite aware of the variable speed feature and suggest that speed control down toward 0 rpm would be next to useless, you need the torque increase of the mechanical advantage obtained by pulley or gear changes.
I think it depends on the VFD Steve. Sensorless vector control models often have 200% of the normal starting torque down to 1Hz. I do know that in low gear, running at 2 RPM, I can't stall my lathe chuck. How much of that is the SVC or the gearing I don't know.
I also know my lathe is a lot smoother and quieter since the conversion. All the vibration and rattling I used to get out of the geartrain is gone now. I'm a believer.
Willie