Thanks again Jon and Chris. What should have been obvious turns out to be the problem. Graphing the encoder index shows random pulses mixed in with the regular pulses. I really did not want this to be the problem since I had already gone through fixing another issue with this encoder. I guess wishing is not a valid method for repairing machinery.
Before, I had a problem with the encoder disk position coupled with a wobble. Now it seems to be an EMI problem because I get occasional index pulses with the disk removed and the spindle turning. I haven't been able to get a reliable reproduction of the fault, so I will be busy with trouble shooting for a while. On Tue, 2007-10-16 at 21:06 -0500, Jon Elson wrote: > Kirk Wallace wrote: > > After having some success with my tuning, I went back to making threads > > without much success. Randomly, but close to every third or fourth pass ... snip > > I assume that the spike in the spindle velocity data is due to a counter > > reset at the start of each pass? > > > > Another problem, that I had read about a while back, cropped up too. > > When I invoke the touch-off dialog, I get a "Bad Number" error unless > > the first thing I do is forward arrow and leave at least the original > > leading zero in the data entry box. > The message just means whatever is in the box isn't valid - just > correct the characters in the box. For instance, "-" or "." are > invalid all by themselves, but "-.5" is OK. > > Jon Previously, the dialog box would complain, but as soon as I got a valid number entered it would stop complaining. Now, as soon as the error message appears, it won't go away until I close the dialog box and start over. I have learned that in order to keep from getting an error message, I must keep an editable, but always valid number in the data entry box. Even deleting the initial 0.0 will toggle the error, so I end up clicking the end of the 0.0, back spacing ( 0.0| , 0.| , 0| ) to the zero and entering the required number such as 01.032. -- Kirk Wallace (California, USA http://www.wallacecompany.com/machine_shop/ Hardinge HNC lathe Bridgeport mill conversion pending Zubal lathe conversion pending) ------------------------------------------------------------------------- This SF.net email is sponsored by: Splunk Inc. Still grepping through log files to find problems? Stop. Now Search log events and configuration files using AJAX and a browser. Download your FREE copy of Splunk now >> http://get.splunk.com/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
