Thanks That seems to have nailed it for me now i can very clearly understand why no pulse is emitted on the pulse line. Well that brings us back to the question of who is going to fix the problem? Is there anyone else working on this other than charles that can maybe work around this using the stepgen velocity mode and deadband etc in Hal? I am a little worried about using it on a daily basis just in case it is damaging the Gecko. I will maybe see if i can get an explanation on one of the Geckodrive haunts.
On 22/02/14 19:30, Peter C. Wallace wrote: > On Sat, 22 Feb 2014, Mark Tucker wrote: > >> Date: Sat, 22 Feb 2014 19:20:57 +0000 >> From: Mark Tucker <m...@rmtucker.f2s.com> >> Reply-To: "Enhanced Machine Controller (EMC)" >> <emc-users@lists.sourceforge.net> >> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> >> Subject: Re: [Emc-users] Crackling motors using Beaglebone >> >> John >> >> Thank you so much for the insight of how that work and it explains a lot. >> But as you stated it would be hunting back and forth.Which i assume it >> would have to pulse the step line? >> And a number of people have scoped the outputs and only found the Dir >> line hunting back and forth,i wonder why it is not detected on the step >> line.? >> And if it is only the dir line,why would the motors make a noise at all? > > The internal stepgen position has a resolution of a small fraction of a step > (1/10000 of a step in Johns example) so it can hunt back and forth without > emitting a step. > > As to why a step drive pays any attention to the dir signal without a step > pulse I do not know, seems like a mistake to me. > > > Peter Wallace > Mesa Electronics > > ------------------------------------------------------------------------------ > Managing the Performance of Cloud-Based Applications > Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. > Read the Whitepaper. > http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > > ------------------------------------------------------------------------------ Managing the Performance of Cloud-Based Applications Take advantage of what the Cloud has to offer - Avoid Common Pitfalls. Read the Whitepaper. http://pubads.g.doubleclick.net/gampad/clk?id=121054471&iu=/4140/ostg.clktrk _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
