Greg, The regular thumping noise, about twice a second, seems to be a symptom of a major timing problem with your step pulses. If you are using software generated step pulses, perhaps there is a video driver problem.
Steve Stallings > -----Original Message----- > From: Gregg Eshelman [mailto:g_ala...@yahoo.com] > Sent: Sunday, September 22, 2013 5:51 PM > To: Enhanced Machine Controller (EMC) > Subject: Re: [Emc-users] Very weird thing with my stepper > motors. They don'tlike to be moved while running. > > On Sun, 9/22/13, Claude Froidevaux <men...@bluewin.ch> 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, 6:20 AM > > > Le 22.09.2013 06:54, Gregg Eshelman a écrit : > > That's not the weird thing. What is effed up is that > when the motor is running if I pick it up or move it, it > stops running. Doesn't matter if it's laying down or > standing on its back end, if it's picked straight up or > allowed to rotate around its shaft axis it locks up and > squeals. Tried two of the three, both do the same thing. > > That let me thing you may have miss-connect the motor. 1 > phase must be > connected between A+ and A- (you shall measure low impedance > on motor > motor side). I have got theses strange result once when I > wired a phase > between A and B output of the driver. > > Claude > > I've checked to make sure one coil is connected to a+ and a- > and the other to b+ and b- Disconnecting the enable line > allows it to run both directions instead of just > counterclockwise. Still has a low and slow pulsing harmonic > vibration. I tried reversing one coil and that made it worse > so I switched it back. I've also swapped pair A and B > locations. Always has this vibration. I also disconnected > both ends of the enable wire and moved the ground to dir - > with a jumper to pul - > > Here's a video > http://www.youtube.com/watch?v=uL9tzYGSVhY&feature=youtu.be > > Have to get rid of that vibration and the sensitivity to > motion. They're over 1,000 oz-in torque, should be plenty of > rotor inertia that one could stick the motor on the end of a > baseball bat and wave it around without bothering it. > > 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. > > -------------------------------------------------------------- > ---------------- > 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=/414 > 0/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ 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
