This is the most annoying thing I've had in the workshop. Yesterday I tried all different kind of setups. I swapped the cards, replaced one card, changed output pins on the parallel port, ran with different speeds and accelerations, did a rerun with the tuning software, swapped cables, checked the soldering, spring loaded the axis to compensate for the common G-force - with the same result. Zero has moved.
The machine have ballscrews with a 60:22 timing belt reduction. The belt wheel on the screw is clamped with a double nut assembly AND four lock nuts. I tried to turn it with force with no luck. I also made a mark to see if it moved compared to the nuts. And nope, it's rock solid. I have two more things to try now. 1. Replace the servo with another one, the only thing that might slip is the servo belt wheel, and it may be a problem with the encoder. 2. To see if the unwanted offset happens with the tuning software. The offset actually did happen when I run the test function in Stepconf, the axis moves the distance set in the test window but it do really change the zero position. Just to make sure it's not a EMC/Rutex problem I'll make some tests with the tuning app. 2009/9/26 Jim Coleman <drunkenwhip...@gmail.com> > I saw you were going to check for slip on the belt drive to your Z > axis, how did that turn out? also, how much backlash is there in the > screw? another thing... the belt is a timing belt, right? and there > is no possibility of slipping there? > > one last thing... if you suspect the amp on Z might be problematic, > have you swapped it with another axis to see if the problem follows > the amp or stays on Z? > > Just some thoughts I had while reading this topic, hopefully you find > your culprit soon. > Jim > > ------------------------------------------------------------------------------ Come build with us! The BlackBerry® Developer Conference in SF, CA is the only developer event you need to attend this year. Jumpstart your developing skills, take BlackBerry mobile applications to market and stay ahead of the curve. Join us from November 9-12, 2009. Register now! http://p.sf.net/sfu/devconf _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
