On Monday 01 June 2020 01:11:22 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 > > It seems I could use the 0 - 10 volt output from a breakout board > (with posible voltage conversion) to control the speed of the spindle. > > Then I place an encoder on the spindle. > > Has anyone made a simple interface that replaces the potentiometer? > No, the only time I did it. I used a pmdx-106. Wasn't low cost. Gave very stiff speed control. Its out of service now though. Someone should make me an offer. Its complete, fwd-rev both lcnc and manual controls and will include a beefed up controller that can do at least a 400 watt motor.
> I don't want to rplace the spindle moter and use a VFD. I think this > shold be very simple and low-cost. Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) If we desire respect for the law, we must first make the law respectable. - Louis D. Brandeis Genes Web page <http://geneslinuxbox.net:6309/gene> _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
