On Thursday 08 September 2016 18:34:33 John Thornton wrote: > Hi Gene, > > I'm afraid the technical details are above my pay grade. I can however > help you with Mesa cards that relate to Linuxcnc.
Aw, gee, John. Aren't you a C.E.T. too? ;-) > My 5i25 > http://mesaus.com/index.php?route=product/product&path=62&product_id=5 >1 > > I also have a C1 and a C1G and a pile of optos for them I'd be very > willing to part with. Let me know what you need. > > JT What do you need for the C1G? FWIW, there no opto's on a C1G. > On 9/8/2016 4:59 PM, Gene Heskett wrote: > > Greetings Peter; > > > > Someone made the remark a while back that it was indeed possible to > > look at the output of a function, in this case the first pwmgen of a > > 5i25 with the prob-rfx2 firmware in it. > > > > I've had a blowup, the ultimate cause of which I have not found yet, > > but from the damages done to the cnc4pc C1G BoB that I have found so > > far, I am inclined to think the spindle motor psu, or possibly > > something line powered failed. The C1G damages so far found are 1 > > blown 74ACT245N, and an almost invisible use of a ground trace on > > the pcb as a fuse. All the opto's in my spindle encoder would appear > > to have failed. Those I have a bag of, but that pcb makes the > > tinfoil of a pack of smokes look like boiler plate, so I'll have > > something I won't call fun replaceing them. > > > > I can run the x/z motors just fine, but the limit switches would > > appear to be closed as those leds are at full britness when its > > several inches from the switches. > > > > What happened is that I had started a short program that called for > > a 400 rpm spindle but had neglected to engage the headstocks back > > gear, so the motor took off and wound out to max speed before I > > could hit the big red button. And about 1/2 second before my hand > > hit the button, there was a pop that came from the box over the > > spindle motor and everything coasted to a stop. The pop sounded > > like it could have been the top of one of the hexfets on the Pico > > Systems PWM-servo amp I am driving the motor with. But they look > > pristine, and all the other components in that box look good and a > > DVM says they are properly powered. Thinking the motor may have > > thrown a winding, I've looked it over and checked for shorts and > > come up empty so far. > > > > Back to the 5i25 question. So I fire up the halscope and send it to > > gpio1.in or in_not. And try to start the spindle from axis with the > > cable to the bob unplugged. > > > > I am seeing a short pulse of 1 volt p-p, which becomes inverted if I > > look at the in_not, and trying to increase its speed has no effect. > > So its beginning to look as if I may have blown this 5i25. And I've > > still no clue what did it. > > > > Do you concur, Peter? In that event, I'll need three more, with low > > profile brackets as I believe the one I was going to run either my > > toy mill, or this Sheldon lathe, has a bad pin that I was using for > > the probe, G38.2, and it got flaky. That was because the big dummy > > I can see in the mirror here forgot to run a decent ground to the > > frame of my G0704. And it was pretty darned noisy when I put a > > scope on it. Fixed, but too late for that 5i25. So now I need one > > for the little monster, one for the Sheldon, and one for my toy mill > > that I've not found a round tuit to do yet. > > > > Thanks Peter, or John T. > > > > Cheers, Gene Heskett > > ---------------------------------------------------------------------- >-------- _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) Genes Web page <http://geneslinuxbox.net:6309/gene> ------------------------------------------------------------------------------ _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
