Hi Preston Thanks for the investigation. The fact of overshoot at one speed and not another is an interesting result. I'm guessing that what we see is two parallel paths one trajectory and one lash. If traj reaches velocity before lash completes you'll see the overshoot. You might try cutting the value of lash in half and see if the overshoot changes.
Rayh On Thu, 2006-11-30 at 19:54 -0500, Preston Baxter wrote: > I got a chance to investigate this further and found that the backlash > is not delayed, but overshooting when the direction changes. This was > with the feed at 25 IPM. If I set the feed to 10 IPM the problem goes > away. What is strange is that it does not overshoot in MDI mode with > the feed set at 25 IPM. Any Ideas? > > Thanks, > Preston > > Preston Baxter wrote: > > Hi, I'm new to the list and have been I've been working with EMC > > version 2.0.4 and noticed a possible bug with the backlash compensation > > when jogging in manual mode. I first select a jog increment, say .010 > > and jog in one direction noting the movement on a dial indicator. When > > I reverse directions by one click(.010 increment), the backlash is not > > taken up. Only when I jog at least one more increment does the backlash > > compensation take affect. It is like the compensation is delayed and > > catches up on the next move. The Backlash Comp does work properly in > > MDI mode. I have not yet checked it but assume it should work in Auto > > mode as well. > > I'm using the default stepper_inch.ini config, with only > > modifications to the motor parameters. Is there a setting somewhere I > > am missing. I worked with the old emc1 back in 1999 and the backlash > > comp seemed to work fine in all modes. > > > > Thanks, > > Preston > > > > > > > > > ------------------------------------------------------------------------- > Take Surveys. Earn Cash. Influence the Future of IT > Join SourceForge.net's Techsay panel and you'll get the chance to share your > opinions on IT & business topics through brief surveys - and earn cash > http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV > _______________________________________________ > Emc-users mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
