Hi there,
> 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. both "should" work. However, there is no guarantee that you'll get one of the supported hardware cards. It would be best to search around wiki.ubuntu.com and around google. a list of USB wireless devices: http://at76c503a.berlios.de/devices.html > 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 would also give you the ability to connect encoders > directly to lead screws or use linear encoders for actual position > feedback. It seems like this would be a little more to set up than just > plain open loop steppers but shouldn't be much more difficult than > setting up a servo system. I don't think I've ever heard of a stepper > based system that is capable of positioning from linear scales. That > should take care of lost steps, lead screw errors, minor amounts of > backlash, etc. it shouldn't be too hard to set things up as you described them above. but there is one thing you need to remember. steppers usually have problems going at higher speeds (torques goes down). so if you start cutting at a too high feedrate, it might get behind the cut. the PID will see that and react, command the steppers even faster, which will most likely lead to even more problems. just my .02$ Regards, Alex ------------------------------------------------------------------------- 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
