I have a static converter for the milling machine, a table top model with power feed 30 in travel I bought for $175 with collets, dial gage a few bits. a used converter was $ 100. I had a spare 3 ph motor t wired into the system. It will not run at full speed. turn on the system. start the slave motor, turn on the mill, turn off the slave, a rotory is nicer but more expensive. The motor is direct drive and a spline drive, not easy to change to a 1 phase.