Thanks Muzzer,

I see. I've tried to be clever and used the logic of what I've read about lathe slideways. It's obviously different on milling machines. Quotes for repairing the board are about 6-700£ My worry is that once repaired/replaced, whatever caused burnout in the first place will damage the board again. Could you be so kind to give me an idea, or even better a link to the new motor drive combo that you'd install in a Bridgeport interact with tnc2500. Also, how easy/difficult would be to replace tnc2500 with something like linuxcnc or equivalent modern cnc setup.

Your help is very much appreciated.

Regards JJL.