Jazz,

The same with over rating components because of bad advise. Following a conversion at the moment on another form of a Taiwanese 636 milling machine.
The guy is using 25mm ballscrews and 1640 oz in type 34 motors, unless he can hit that with 10,000 volts it will crawl but bigger is better - yes ?

End of the day he'll get as much 'useable' power as a 600 oz/in motor and probably twice the speed.