On 06/01/2020 12:11 AM, Chris Albertson wrote:
My cheap Harbor Freight mini mill has a variable speed spindle that is
controlled by hand with a knob on the front of the mill. This knob turns a
potentiometer. I think all mini mills work like this.
Has anyone interfaced the potentiometer to LinuxCNC? I don't have the
schematic for the spindle motor controller but I assume the potentiometer imply
sends a control voltage to control the duty cycle of a PWM generator. The
motor is a simple DC brushed motor
Most importantly, note that this speed control is NOT
isolated from mains voltage. So, any interface
with it needs (presumably) optical isolation. Several
outfits (PMDX, CNC4PC, I think) make interfaces to these
speed controls.
Jon
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