On Monday, April 30, 2012 10:47:25 AM gene heskett did opine: > Hi all; > > I got things back together enough to make some swarf last night, which > disclosed that my x motor needs more Wheaties. I can't plunge cut > across the end of a piece of cold roll rod with a cut depth of more > than 2 or 3 thou. > > Looking in the hal docs, it looks like a module named near could help me > to keep from looking like an idiot in front of the frogs. I had fired > off a short program to carve the section of this BP nipple down to a > size ready to cut some threads in. Unforch, I forgot the release the > power switch so the spindle didn't start on queue from the M3 in the > program. > > So, 2 questions result: > The next motor I can put on there will be an 8 wire 425, which carries a > 5 amp label that I assume would be the rating for unipolar drive, so > regardless of whether I parallel 2 aiding windings or just use 2 and > insulate the other two, the torque at X current would be the same. > However, if I parallel it, I should halve the inductance & thereby gain > some speed. The maximum this driver, a 2M542 can do is 4.2 amps so > that should give me 425 /5.0 * 4.2 =357 oz/in of torque, about 7x the > torque I have now. And a quite decent speed, much needed according to > those papers I just read. > > 1: Is there anything wrong with that thinking? > > Then 2: > How do I access the hal version of the programs S>0 command (qualified > by an M3 or M4 in effect, so I'd assume its one of the > motion-spindle-enable signals) for use as an input to near, so that I > can compare that to encoder.0.out-filtered? > > Eventually I want to use the near output to also detect an incipient > spindle stall, in addition to this "fail at startup" function. But lets > get a usable output from near first. It will obviously need > "calibration" > > :) > > Or is "near" even the correct approach? Humm, that's 3 questions. > > Cheers, Gene
And I realized when I read the echo this morning, that I have forgotten to say Thanks. Thanks & Cheers, Gene -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) My web page: <http://coyoteden.dyndns-free.com:85/gene> Clones are people two. ------------------------------------------------------------------------------ Live Security Virtual Conference Exclusive live event will cover all the ways today's security and threat landscape has changed and how IT managers can respond. Discussions will include endpoint security, mobile security and the latest in malware threats. http://www.accelacomm.com/jaw/sfrnl04242012/114/50122263/ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
