On Jan 5, 2009, at 7:51 PM, Stephen Wille Padnos wrote: > Dave Engvall wrote: > >> [snip] >> >> If my memory serves me correctly then there might be an intermediate >> position. >> I think code exist by JMK to use an rotary encoder plus a linear >> scale. >> >> > Yes, we did this on Stuart's G&L servo machine. > >> Could this be extended to separate the I from PD in steppers and use >> an encoder on I to drive final position. >> >> > Since steppers don't use PID, and would fail miserably if they did > (since PID generally increases requested effort when the motor > starts to > lose position, which (a) is too late and (b) is the exact opposite of > what you want to do with a stepper), I don't think this would help > much.
OK, no PID ... no workee. D > >> Maybe I've been smoking the wrong stuff .... who knows. >> More caffeine certainly won't fix things. :-) >> >> > You never know :) > > - Steve > > > ---------------------------------------------------------------------- > -------- > _______________________________________________ > 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
