The problem is the rear shaft isn't that long. I went through the process of considering an adaptor plate that fastened to the 4 holes. There may be a fancy way of making a thick plate with a thinned area just for the encoder mount. But it would have to have a stud protruding away from the back and then a nut. The plate can't be thick enough to hold both the encoder and threads for screws and still have the encoder disk mount to the back shaft.
The alternative would be to press fit on a shaft extension and then use the stepper motor to turn the extension to be symmetrical with the axis of the motor shaft. Then I could use a thicker mounting plate. Or, given that the motor drives a 25:1 planetary gear and I'm really only interested in tracking motor revolutions and detecting stall conditions (hence quadrature) I could likely get away with a custom disk and some slotted sensors too. Also more complicated to build. Trying to keep it simple and the easiest is to have the encoder screw directly to the back of the motor. However with StepperOnline motor by the time it's here in Cdn $ it's over $100. So I can take the risk and drill holes in the back. Or get creative with other approaches. John -----Original Message----- From: andy pugh [mailto:bodge...@gmail.com] Sent: June 25, 2023 1:57 AM To: Enhanced Machine Controller (EMC) Subject: Re: [Emc-users] Drilling holes in the back of a stepper motor On Sun, 25 Jun 2023 at 04:31, John Dammeyer <jo...@autoartisans.com> wrote: > Is there any reason I can't clamp the motor in a vice and pop in two holes > and tap them with a bottom tap at the spacing of the mounting flange? I have done it in-situ, but there really isn't all that much metal in there. I think pulling the back cover off (leaving the rotor in place) and choosing your mounting point carefully would probably be best. Or, as Gene says, use the existing holes, very short screws, and an adaptor plate. -- 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 Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
_______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
