On Sun, 9/22/13, andy pugh <bodge...@gmail.com> wrote: Subject: Re: [Emc-users] Very weird thing with my stepper motors. They don't like to be moved while running. To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Date: Sunday, September 22, 2013, 4:05 PM On 22 September 2013 22:50, Gregg Eshelman <g_ala...@yahoo.com> wrote: > That's something I've noticed in every Youtube video of people showing stepper motors running. Nobody ever picks up or otherwise moves them except for when they're firmly mounted to something like the head on an X-Y gantry. Moving the motor should have absolutely no effect. *Should not isn't keeping this setup from not working properly.
Have you tried inverting the step pulses (in Stepconf). The drives/BoB might need active-low. *Yup. Still has the pulsing vibration. Change the step time? I tried upping the microstepping to 800 on the drive. No change, just slower, still stops spinning if I allow the motor to move around. The advice earlier about connecting the + terminal of each drive input pin to +5V and connecting the BoB inputs to the - terminal on the drives was, I think, good. That is how my drives need to be wired. *Tried swapping the + and - and it doesn't work. This BOB appears to work positive output only, with a separate ground for each axis. But wait, it gets weirder. I switched the wires back to + and tried it again with the driver set to 800 steps. Now I can twist and wave the motor all about and it *doesn't stop*. Progress! But it still has that pulsating vibration. I'm thinking the seller's claims about "smoothness" are much exaggerated. ------------------------------------------------------------------------------ LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99! 1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint 2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/22/13. http://pubads.g.doubleclick.net/gampad/clk?id=64545871&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
