My SB has 2 motors, One for the main drive and another one for the "fine feed option" The banjo can be moved so that the second motor drives the lead screw. I run both the motors off the vfd at the same time. Before the vfd, the lathe ran from a rotary phase converter. I merely unplugged the phase converter and hooked the VFD to the lathe. There are two fwd/rev swithes on the lathe. One for the underdrive motor and the other for the fine feed option. I run them both at the same time and have no issues. The vfd is very forgiving. It understands over current and shuts down. It understands overspeed and shuts down. I have a lot of faith in the guys that design them. I am a EE but spent most of my career in the computer industry not in industrial controls.
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VFD for my Lathe
- Thread starter GasMan
- Start date