I have an old south bend heavy 10 lathe. It is very limited for speeds especially mine since someone did away with the motor pulleys to change it to low speed. It has a small 110 volt motor, I think it is only 1/3 hp so I am thinking about getting a 1.5 or 2 hp 3 phase motor and put a 110 volt input vfd on it so it will have almost infinite speed changes. I know very little about vfd's so if some of you have some suggestions let them fly but please explain why so I can learn too. The primary concern is money. I do not want to invest a fortune in this old lathe. There are many better ones on the market but I already have this one so I would like to keep the drive conversion under $300 . It looks doable if I get some parts off ebay.