RogerN wrote: > Would my EMC2 system work with USB wireless networking? I'm thinking of > this because I could connect the USB wireless adapter to a USB extension > and position it for better reception. I'm just not sure if it would > work on my Ubuntu Linux EMC2 system. Another option would be a PCI card > and an external antenna with cable. > > Also, after getting to play with hal configurations a bit, It seems like > it wouldn't be too difficult to get steppers working with encoder > feedback. If you would set up a pid loop => frequency generator and > configure velocity feed forward to run the steppers at the commanded > velocity, then pid gains could be set to take care of position > deviations. This would be useful in detection and correction of lost > steps for one. It will correct for single lost steps, especially at axis reversals. This should never happen anyway, it is because of a mismatch between step/direction timing from the controller and what the step driver requires. It would be better to fix the step timing rather than cover it up.
This scheme will not handle motor stalls, however! Once the motor has stalled, it will just grind and rattle rather than catch up and get back into lock (until the computer slows down the commanded velocity.) Jon ------------------------------------------------------------------------- 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
