On Sunday 22 September 2013 19:23:12 Steve Stallings did opine: > 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
That could be an applicable thought Steve, but when I was fooling around with a non-real time kernel several years ago, it was far more randomized. This is quite regular, which is why I suggested if the motor power is coming from a switch mode supply, the recirculating current from the motor driver could be driving it into a regular protective shutdown. Some switch mode supplies will go totally ape when they suddenly get 2+ amps shove back into the output terminal. That, and that BOB seems, from the description the OP has given so far, has a good chance of being a problem child. Do you have any more of those 8mmx2.5 screws? > > -----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.cl > ktrk _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) For every action, there is an equal and opposite criticism. -- Harrison A pen in the hand of this president is far more dangerous than 200 million guns in the hands of law-abiding citizens. ------------------------------------------------------------------------------ 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! 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