Quote Originally Posted by Ricardoco View Post
i2i to the rescue.... now we're cooking on gas, this looks like what im gonna go with, all the work is done for me Hmmmmmm
I thought you wanted higher speed than that?

To get '>6000rpm and 1000rpm should the need arise' is challenging. The vast majority of spindles use induction motors and to get the variable speed we use a VFD. The problem with this is you can only get full power down to about half the motor's rated rpm, then below that it drops linearly. So in short either you use a massively overrated motor, or have belts so you can change the drive ratio and keep the motor operating in the rated power region. On my micro lathe I went for the former, which would have been expensive except I had already got the motor.