Quote Originally Posted by Agathon View Post
Thanks, sorry for being so dim about this - it's begging to make sense. Also many thanks for the links.

BTW. Apart from power, is there any difference between servo motors used for positioning ie x,y,z axis motors and servos used for spindles?
Yes and No. Any servo motor rightly belted could serve for spindle. But then comes the RPM. The servos that are meant for spindles could spin at higher RPM and have slightly different curve. We are talking about typical motor that will be connected to BT30, etc spindle via belt. As Yes, you could gear up any servo motor but then you need bigger more expensive motor.

these are the servo spindle motors. they gto up to 15k rpm https://www.aliexpress.com/store/pro...809932059.html