Hello Bill,

I can only echo what other people have said about your rebuild. It has been a great read prior to the, hopefully soon, delivery of a KL-1 I'm negotiating to buy.

In the mean time I have been reading about your VFD conversion, including the information and drawings from the Yahoo Hardinge Group.
If I may, I had a couple of questions about the VFD that have been confusing me.

Yourself and some other people use a 240v to 480v transformer to power the VFD.
From the information I can find about the Siemens MM150 you use, it appears to be a 240VAC Single Phase input device, and looking through general component suppliers (RS), the only 480VAC input VFD's are 3 phase inputs, and the single phase input VFD's are 240VAC.

I wondered what the reason for the transformer is, since I assume that you are still only getting a single phase output from the transformer, just at 480v ?

I wouldn't have thought you could feed a 480VAC single phase into a FVD designed for a 480VAC 3 phase input, can you ?

Yours Confused !
Paul.