Hello, all, I am just back from the NAMES show in Toledo. It was a great show, and I talked to a lot of people interested in CNC. Only Fred Smith of IM Services, and Steve Stallings of PMDX were there as others in the CNC field. Oh, and Sherline, of course, but they were not pushing their CNC line.
I saw the 1/3rd scale Ferrari by Pierre Scerri of France, and he ran it, producing a huge cloud of blue smoke. Lots of other incredible artistry, too. I had my 150-Lb mini-mill there, and was running an uncharacteristically recent version of EMC2/Ubuntu. I was demonstrating single point threading, with the mill set up like a lathe. I ran it a number of times, and started having a problem with the threading.ngc program failing to stay in sync with the spindle after being run several times. At this point, I really can't say whether it is hardware, software or EMI, as we probably had 250 people in one room with cell phones turned on, and 50 of them holding conversations on them. I'm just inquiring if anyone else has used the threading.ngc program, and what results you had with it. I will be doing testing under more controlled conditions here at home to try to find out where this problem is coming from. I attempted to nail down the problem at the show, and the only data point I seemd to get consistent results with was that restarting EMC would guarantee one clean run of the program. After that, re-running the program would sometimes cause it to blast ahead instead of syncing to the spindle. (Another thing which I am almost 100% confident is true, is that the spindle sync'ing either ran perfectly for one complete run of the program, or that it failed consistently for every threading pass on that program run. A timing issue in the encoder logic would not know one program run from another.) Anyway, this could be caused by the encoder counter failing to zero at the index pulse, while the driver sensed that the index pulse has been seen. (Please don't remind me that this may be related to other problems in the area of homing with index that I am still investigating, I am WELL aware these are almost entirely the same function.) All comments are welcome, Jon ------------------------------------------------------------------------- This SF.net email is sponsored by DB2 Express Download DB2 Express C - the FREE version of DB2 express and take control of your XML. No limits. Just data. Click to get it now. http://sourceforge.net/powerbar/db2/ _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
