Hi,

I am almost done with CNC-ing a Grizzly G8689 Mini Mill. I have X, Y and Z Steppers running, I added a belt drive and replaced the bearings on top and bottom of the spindle. I removed the internal plastic gears that I could.
I am making Limit and Home mounting brackets, When I cut aluminum, the spindle gets HOT. So hot that it is hard to touch. Is this a result of adding a belt drive or do I have some other issue going on?