No offense. I'm a pretty smart guy, but when I don't know something I don't hesitate to ask for help. I would have thought the Spedestar would have been good for this application since its rated for single phase input all the way up to their largest HP sizes. Very few other VFDs over 5HP (3.7Kw) are rated for single phase input usage. Then you have to derate them to about 3.4 HP. I had the chance to buy some big lathes (bigger than my 14x40) a couple years ago cheap, but they had 10HP motors and other than installing a large rotary I didn't see an answer at the time so I passed. The 5HP Spedestar was the only one I knew of at the time. I hope the Huan Yang can handle it. I'll definitely be curious to find out. If it does ok it will open up some avenues for machines for me.