Well I increased the MIN_FERROR in the ini file and that solved the problem of the following error while homing only with index.
What's not clear to me is why I can't home with the switch and index. I'm only changing the HOME_SEARCH_VELOCITY to 0 and nothing more. El vie., 10 abr. 2020 a las 19:06, dave engvall (<dengv...@charter.net>) escribió: > > On 4/10/20 1:01 PM, Peter C. Wallace wrote: > > On Fri, 10 Apr 2020, Leonardo Marsaglia wrote: > > > >> Date: Fri, 10 Apr 2020 16:50:15 -0300 > >> From: Leonardo Marsaglia <ldmarsag...@gmail.com> > >> Reply-To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net> > >> To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net> > >> Subject: Re: [Emc-users] Home use index problem (In step + dir mode) > >> > >> Thank you Peter for your quick response. > >> > >> I just checked my ini file and the entry is like this HOME_USE_INDEX > >> = YES. > >> I also have set SEARCH VEL and LATCH VEL at 10 and 5 respectively. I > >> even > >> inverter the differential pins on the Z pulse just to be sure they > >> weren't > >> backwards but the behaviour is the same. I'll keep playing with it > >> but for > >> now I can only set the index pulse to on manually. > >> > > Do you have a home switch and is it working? > > If you want to home to index only you must set HOME_SEARCH_VELOCITY to 0 > > > Just to muddy the water: I don't use the home switch, just manually > adjust starting point so a laser pointer is coincident with a hole in a > tab (x & y). Kick off homing and it picks up the index and moves to the > appropriate axis zero. It is about as lazy as one can get and still have > it work. For Z I set the cam so it jsut touches the tab on the limit > switch. > > Dave > > > > >> > >> > >> Is it talking about using the step mode in velocity to drive the > >> servo in > >> velocity mode? Because I'm using it in velocity mode but just as > >> suggested > >> to close the loop internally and gain more accuracy at the output. Not > >> closing the loop with the motor encoder. > >> > > > > If you are using a pncconf generated hal file, the stepgen will always be > > in velocity mode. though it may have internal (from stepgen) or > > external (from encoder) position feedback > > > >> Anyway these servos I don't think can't take pulses as velocity > >> command. I > >> have the hardware to output +/- 10 volts but I rather use them as > >> step and > >> direction to avoid mounting encoders on the screws. I don't think > >> using the > >> encoder on the motor to be the best idea because the motor is coupled to > >> the ballscrew by means of a toothed belt. > > > > Do the servos have a emulated encopder output (you mentioned a Z > > signal, is that from the drive?) > > > > El vie., 10 abr. 2020 a las 16:31, Peter C. Wallace (<p...@mesanet.com>) > > > > > >> On Fri, 10 Apr 2020, Leonardo Marsaglia wrote: > >> > >> > Date: Fri, 10 Apr 2020 16:11:18 -0300 > >> > From: Leonardo Marsaglia <ldmarsag...@gmail.com> > >> > Reply-To: "Enhanced Machine Controller (EMC)" > >> > <emc-users@lists.sourceforge.net> > >> > To: "Enhanced Machine Controller (EMC)" > >> <emc-users@lists.sourceforge.net > >> > > >> > Subject: [Emc-users] Home use index problem (In step + dir mode) > >> > > >> > Hello guys again, > >> > > >> > I'm testing the homing of the X axis with a push button and that works > >> > except when the index pulse has to trigger. That never happens. > >> > > >> > I'm using the 7i52S to move my servo with step + dir for position > >> command > >> > right to the drive. In LCNC the stepper is working in velocity mode > >> like > >> > it's recommended. I'm reading the Z pulse of the servo motor thru the > >> same > >> > 7i52S using one of the encoder inputs. I'm only reading Z because I > >> don't > >> > need A and B for my purposes now. > >> > > >> > The problem is, I can't make the homing with index feature to work. > >> I can > >> > see the index pulse triggering to FALSE when the shaft completes the > >> turn, > >> > and I even set the pin to TRUE again manually to see if the homing > >> sequence > >> > stops, but the motor keeps turning at final velocity waiting for the > >> index > >> > to happen. > >> > > >> > I'm even monitoring the joint.0.index-enable pin with Halmeter to > >> be sure > >> > the signal is linked and it's working ok. The only thing I find > >> strange > >> is > >> > that I need to set the index-enable pin to TRUE by myself. The homing > >> > sequence doesn't seem to be doing that. > >> > >> It sounds like you dont have homing to index enabled in your ini file > >> (if motion does not set index-enable, it will not look for it going > >> false) > >> > >> That said I dont think this will work correctly on step/dir systems > >> without > >> encoder feedback. The reason is that on index detection, the reported > >> position > >> on encoders is zeroed, (and motion expects this behavior) this is not > >> done > >> on > >> stepgens. The hardware for capturing the index and the stepgen count at > >> index is in the firmware, (allowing stepgens to emulate encoder > >> behaviour) > >> but the hm2 driver has no support for this option. > >> > >> > >> > >> > > >> > I'm using LCNC 2.8.0-pre1-5538-g21d7db0. I was thingking maybe this > >> > feature is not allowed with steppers and that's why I can't use it? > >> But > >> the > >> > homing sequence is actually waiting for that index pulse so I don't > >> think > >> > this is the case. > >> > > >> > I'm surely missing something here, but without your help I'm a > >> little bit > >> > lost. > >> > > >> > As always thank you for your support! > >> > > >> > _______________________________________________ > >> > Emc-users mailing list > >> > Emc-users@lists.sourceforge.net > >> > https://lists.sourceforge.net/lists/listinfo/emc-users > >> > > >> > >> Peter Wallace > >> Mesa Electronics > >> > >> (\__/) > >> (='.'=) This is Bunny. Copy and paste bunny into your > >> (")_(") signature to help him gain world domination. > >> > >> > >> > >> _______________________________________________ > >> 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 > > > > Peter Wallace > > Mesa Electronics > > > > (\__/) > > (='.'=) This is Bunny. Copy and paste bunny into your > > (")_(") signature to help him gain world domination. > > > > > > _______________________________________________ > > 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 > _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
