Maxime Lemonnier wrote: > Thinking to it.. the only clue I have is that the error is always in the > same direction : the z-column always tend to move higher than it should. > > Fo the moment I guess the machine is usable for milling. I will limit z > acceleration (ah it could be a nice way to find out if it the problem is > mechanical or electronical : reduce the acceleration!) > Acceleration REALLY shouldn't have any effect, even with a bad encoder. But, yes, it may be helpful in isolating the problem.
OK, now that you've determined the shift is always in the same direction is interesting! Encoders that have something wrong with their quadrature phase relationship often lose counts in one direction more than the other. I would remove the encoder and reinstall with their centering procedure. Incorrect centering of the read head could cause this sort of problem. > I know the problem is possibly not related to your product, and I'm very > thankful that you help me out. > > One day I hope I can "pay back" and help you with anything (Software?). > Likely you can't help ME, directly, but if you want to contribute to the EMC project, that would be great. There are MANY areas where we could expand the features of it. At some point, I am hoping to port EMC2 to the "Beagle Board", an open-source CPU all on a single 3" x 3" PCB. With a few accessories it runs about US $200. At present there is no real time kernel for it, but it does run Linux quite nicely. I provided a Beagle Board to one of the RTAI folks, and hope in a month or two he can get a RT kernel running. I will be getting a PCB back from the fabricator shortly that will adapt a parallel port to the Beagle. So, that is my crazy development project for this winter. Jon ------------------------------------------------------------------------------ Let Crystal Reports handle the reporting - Free Crystal Reports 2008 30-Day trial. Simplify your report design, integration and deployment - and focus on what you do best, core application coding. Discover what's new with Crystal Reports now. http://p.sf.net/sfu/bobj-july _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
