On Wednesday 25 November 2015 08:59:45 Rick Lair wrote: > Here is a screenshot of what it looks like, after the machine has > homed itself, http://postimg.org/image/c8s8eqret/ look at the DTG of > the A axis, why does it look like this, and why would it take off as > soon as it homes itself, to some random position, like the one shown, > at MAX_VELOCITY?
If thats a servo, what sort of an encoder? I run my cheap table with a stepper, so no encoder involved. If I do "home it", its to a level bubble laying on a jaw, but I use touchoff for that zero. Handy for establishing the roughly correct angles to turn a tool to for sharpening. That does not of course handle its backlash and I have no automatic facility to lock it down at any particular angle except the cheap brass thumbscrew, which is in fact incapable of holding it. > > To me it is acting like a run away servo, but that makes no sense to > me, because after going over things multiple times and physically > checking the analog drive voltage and the servo drive parameters > again, I don't see how I can get a runaway. > > If I jog the table, in a positive rotation, I have a positive command > voltage going to the drive, I get a positive table rotation physically > and I get an upward counting DRO, Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ Go from Idea to Many App Stores Faster with Intel(R) XDK Give your users amazing mobile app experiences with Intel(R) XDK. Use one codebase in this all-in-one HTML5 development environment. Design, debug & build mobile apps & 2D/3D high-impact games for multiple OSs. http://pubads.g.doubleclick.net/gampad/clk?id=254741551&iu=/4140 _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
