Thanks Gene. Will consider how to get this done in the Hal based on your tips.
On Fri, May 8, 2020 at 2:03 PM Gene Heskett <ghesk...@shentel.net> wrote: > On Friday 08 May 2020 14:34:06 Dan Henderson wrote: > > > There are times when letting the smoke escape becomes part of the > > learning process :) > > > yes, and we all do it, its the nature of us. > > > Thanks for your guidance Gene. Would think the DC motor energy would > > be absorbed by the act of tapping once the M3 is turned off? Surely > > the G33.1 cycle doesn't flip from 500 CW to 500 CCW does it? I'm going > > to want to initiate that cycle with a slow spindle to begin with and > > I'm not sure how built-in speed ramp controlled by the MC-2100 will > > handle this. A hacked in pause between M3 and M4 may be order, huh? > > It can flip from 3k to -3k.Very VERY hard on both the electrics and the > machinery if not gentled up a bit. Following my recipe will generally > work though. > > The point being that motion goes directly from M3 to M4, or back. There > is no M5 in the middle without your making it happen with hal. > > > On Fri, May 8, 2020 at 12:45 PM Gene Heskett <ghesk...@shentel.net> > wrote: > > > On Friday 08 May 2020 13:34:36 Gene Heskett wrote: > > > > On Friday 08 May 2020 12:09:45 Dan Henderson wrote: > > > > > Thanks Andy/Jon/Gene. To enable Quadrature do I merely turn on > > > > > phase-A/B/index inputs and remove “encoder-counter-mode = True”? > > > > > > > > Sounds good. > > > > > > > > > Here’s a pic of the reverse circuit I’m making to enable M4 > > > > > polarity reversal of the DC motor. > > > > > > > > We all know this stuff runs on smoke and mirrors. > > > > > > > > That controller probably will NOT like being reversed without > > > > first stopping the motor, then reverse that relay and restart the > > > > motor. > > > > > > > > Doing otherwise will probably break the mirror and let all the > > > > smoke out. Typically they don't work anymore. > > > > > > > > Ideally, two relays. I have used the P&B ice cubes with 20 amp > > > > contacts for this. One to apply a braking resistor to absorb the > > > > motors energy as its stopping and a second to do the reversal. Its > > > > wired closest to the motor with the moving contacts to the > > > > armature. > > > > > > Thats ambiguous, the braking relay is closest to the motor. > > > > > > > A calrod coil out of an electric cookstove makes a good braking > > > > load. Somewhat overkill but 100% serviceable forever. > > > > > > > > The reversal sequence would be: > > > > 1. hold the reversal from motion, blocking it from the controller > > > > > > > > 2. use that to reduce the drive to zero useing a rate limiter like > > > > a limit3, switching its input with a mux2. > > > > > > > > 3. When the drive is off, switch on the load R relay to stop the > > > > motor much quicker. > > > > > > > > 4. when, according to the encoder, the motor has stopped, release > > > > the braking relay, > > > > > > > > 5. enable the reversal relay AND restore the speed input to the > > > > limit3 and let it ramp the motor back up to set speed > > > > > > > > Do the same thing in reverse at the top of the backout move. > > > > > > > > hint, an xor2 is used to detect the change in state of the rev > > > > signal from motion. A miss-match is the trigger for the stop > > > > sequence. > > > > > > > > I ran my 7x12 that way for about 2 years without letting the smoke > > > > out. But with a heavy 5" chuck, the overshoot at the bottom of the > > > > hole was terrible. So I eventually threw more money at it. > > > > > > > > Cheers, Gene Heskett > > > > > > 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) > > > If we desire respect for the law, we must first make the law > > > respectable. - Louis D. Brandeis > > > 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 > > > > _______________________________________________ > > 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) > If we desire respect for the law, we must first make the law respectable. > - Louis D. Brandeis > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
