On Mon, 1 Jun 2020 at 06:13, Chris Albertson <[email protected]> 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. > If it is a KBIC speed controller then the manual says how to drive it with an analogue voltage. But be aware that the potentiometer is referenced to live on the KBIC, it must be thoroughly isolated from any logic voltages, humans or pets. I briefly used: https://photos.app.goo.gl/a3eXKkw4EsyGfCmT6 to control a pair of KBIC before blowing up one of the motors and switching to VFDs and three-phase motors. A much simpler thing is: https://photos.app.goo.gl/wMHZPQJT72wYvSsa9 which I have used for a VFD but would probably work with the KBIC. Or: http://store.mesanet.com/index.php?route=product/product&product_id=205&search=SPIN -- atp "A motorcycle is a bicycle with a pandemonium attachment and is designed for the especial use of mechanical geniuses, daredevils and lunatics." — George Fitch, Atlanta Constitution Newspaper, 1912 _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
