The 200 watt spindle on my CNC3040 went pop today. It was my own fault; I was trying to clean up a part during cutting and got a cloth caught on the cutter. It didn't like flinging it around.

So, I'd like to build a new spindle with an outrunner motor and ER11 chuck. Something around 600watts.

My first question is what do I actually need? I know I need a motor and a speed controller, but do I need something to 'drive' the speed controller? I read something about using a servo tester. Secondly, what is this 'Li-Poly 2-7 cells' stuff? Why don't they just say the voltage it runs on?

As I have a non-functioning machine right now I'd like to get parts from the UK to get quick delivery. Any tips on where to get motors, speed controllers and chucks from?

Thank you :)