Hello, all, I was machining something this evening using a program which I had used some time ago under my 1999 version of EMC. The behavior of fixture offsets seems to have changed.
Here's what I did : I am using the Axis interface, I set the part coordinate system with the on-screen "touch off" button so the lower left corner of the part was (0,0). The program has code like this : G10 L2 P2 X9.5 Y1.5 G55 It then machines some features from a (0,0) coordinate reference, which it expects to be at x=9.5 y=1.5 in the G54 coordinate system. When I tried to run this, I got "move exceeds soft limits" errors on both axes. I fiddled around in MDI mode to try to figure out how the G10 L2 function works, and it seems you need to know the offset between the G53 and G54 systems and use that in your calculation. What I ended up doing was to go to G54, move to X9.5 Y1.5 in MDI and then switch to G55 and observe the coordinates on the display. Let's say they were X=5.3 Y=-1.7 To get the current location to read as (0,0) I had to enter G10 L2 P2 X5.3 Y-1.7 This seems to be totally awkward, as it requires the program to know the difference between the machine coordinate system and the relative (work) coordinate system before the blank workpiece is even put on the machine. Shouldn't all these fixture offsets be relative to G54, rather than G53? I read all I could find in the .pdf user manual, and got more confused. It seems to generally confirm the above is what is going on, but this seems very cumbersome. Is there a simple way to align, say G55, to a precise offset from G54? I NEVER, EVER, use the G53 system, and the only purpose I can imagine for it is to know where the machine limits are. Getting out of EMC to edit the var file is not a good idea after you've used an edgefinder to locate the part's edges, either. I am using a version of EMC2 that is a couple weeks old, early July. Nothing in the bugfix list indicates any changes in this area, so I hope I'm not wasting anybody's time with this. 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 [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
