On Fri, 02 Oct 2009 15:24:24 -0400, you wrote: >Page 5 and 6 show it but not at a good time scale, page 7 from the base >thread sample shows it very clearly Steve. Noise. Until that is gone (and >encoder A output could have a closer to 50% duty cycle too, I'd almost return >that one in fact if its sealed and non adjustable), it isn't going to work, >not even if we make sacrifices. :) > >I have to assume the encoders cabling is shielded, and the shield ends at the >encoder so there is no connection via the shield to the machine by way of how >the encoder is mounted and driven. That would be what we call a ground loop, >and that is usually a no-no.
Thanks Gene, that gave me clue and I found it - The encoder cable had a strand from the shield touching the plug at the controller end. Much, much better now, but still has the odd glitch, from where I don't know. disconnecting all the grounds didn't get rid of it. As for the 50% duty cycle, can't do anything about that other than replace the encoder. But - running at slow speed it's MUCH better, and running my test 1.5mm pitch test file at my normal 700 rpm it's not noticeable at all. Have a look at the difference :) http://filebin.ca/brcenc/encoder.pdf Steve Blackmore -- ------------------------------------------------------------------------------ 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
