I went through this exercise not too long ago. Short answer is that there is no way to do it in gcode that I could find.
However I did find some tricks to get around the problem, none of them really satisfactory though. This is to control an axis independently without adding more computers. The best solution I came up with that works for me, although fairly complicated, is this: Added a new non standard GCode G00.1 which acts like an instantaneous G00. My code for this hack is horrible since I just wanted it to work. Add a multiplexer to the hal file so that normally stepgen.motor.pos-fb is connected to the axis.motor-pos-fb, but when switched on by a digital output from gcode, the axis.motor-pos-cmd is connected directly to the axis.motor-pos-fb. You need this so that following errors don't occur when an instantaneous move occurs. Add a comparator to the hal file so that when stepgen.motor-pos-fb is the same as stepgen.motor-pos-cmd a digital input goes high. So to do an independent move, first set the digital output which controls the multiplexer to true, this short circuits the feedback for the axis so no following errors will occur. Then issue your G00.1 command, and the axis will begin moving. It will also finish the G00.1 immediately even though the axis is still moving since the stepgen has it's motor-pos-cmd set and will keep moving towards that goal. You can now issue other GCode commands. When you want to return control of the axis back to coordinated motion, wait until the digital input connected to the comparator goes high which means the axis is back in position and set the digital output back so that the stepgen-motor-pos-fb is connected properly back to the axis-motor-pos-fb. Lawrence On Thu, Apr 1, 2010 at 11:50 PM, Klemen Dovrtel <klemen_dovr...@yahoo.com>wrote: > Hello everybody, > > Is there a way to move axes independently using G code? For instance i want > to move G0 X200 Y300 and at the same time G1 U30 F100 and G1 V20 F50. > > This probably won't work: > N100 G0 X200 Y300 G1 U30 F100 G1 V20 F50 > > Regards > Klemen > > > > > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
