How old is that mill? Those Chinese mini mills and lathes have had PWM spindle
motor controllers for many years. I used to have a Grizzly mini lathe with a
low 3 digit serial number, probably from the first batch they imported. I was
at least the 3rd owner and I had to fix a lot of issues, both original and from
prior owner abuse. One fix was resoldering one end of a big resistor on the
primitive and very noisy motor controller.
You can buy a new PWM motor controller and potentiometer to upgrade.
http://benchtopmachineshop.blogspot.com/2017/01/mill-speed-controller.html
On Sunday, June 13, 2021, 2:30:15 PM MDT, Chris Albertson
<[email protected]> wrote:
I have a Harbor freight mini mill with the dumbest possible spindle
control. The mill comes from the factory with a variable resistor to
control speed. My idea was to connect a variable resistor to a $5 model
airplane servo. So the PWM output from LinuxCNC drives the servo and the
servo turns the pot which controls the spindle motor. I would never be
able to do rigid tapping with this setup.
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