Brushless DC motors are common place ... A general RC Vehicle electronic speed control and a servo tester work in conjunction to manually regulate the spindle speed. Check out the bench test ...

The challenge that machine tool builders face when designing spindles is selecting bearings with the optimal balance of speed ...

so speed control of the spindle via Gcode is nigh impossible. They’re also usually built with a piece of plywood as the bed – cheap, but not high on repeatability. The Nomad CNC mill fixes ...