In any feedback motor control system when an torque overload occurs, you have two choices, stop or slow down. In a CNC environment there is a good chance the slowing down would remove the torque overload, so the trick would be too slow down all of the machine motors in a strictly proportional manner.
JohnDHH ----- Original Message ----- From: "RogerN" <re...@wildblue.net> To: "Enhanced Machine Controller (EMC)" <emc-users@lists.sourceforge.net> Sent: Sunday, January 04, 2009 8:36 AM Subject: Re: [Emc-users] A wish - Closed Loop Steppers > I've thought about trying the following in EMC2. Set up the stepper axis > with encoder feedback. Have the step rate be the commanded step rate + > proportional to error. Have a following error shut the system down if > error > is greater than maybe 10 steps. If the axis is stalled, the error should > grow greater than 10 steps real fast, if not it should be able to make up > lost steps. The idea I was interested in was to use linear scales from a > DRO for actual position feedback. This could get you to position with or > without lead screw errors, step errors, etc. It wouldn't prevent stalling > an axis but at least detecting the following error could shut down before > ruining the part. (assuming it stalled out on a roughing cut that can be > cleaned up on a finishing cut, and didn't gouge) > > RogerN > > ----- Original Message ----- > From: "Roger" <vrsculp...@hotmail.com> > To: <emc-users@lists.sourceforge.net> > Sent: Sunday, January 04, 2009 9:07 AM > Subject: Re: [Emc-users] A wish - Closed Loop Steppers > > > Snip >> _______________________________________________ >> 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
