On Sat, Sep 4, 2010 at 8:29 PM, Jon Elson <el...@pico-systems.com> wrote:
> Chris Radek wrote: > > > > For additional safety I also set up my ladder to require the Z home > > switch to be activated in order for a tool change to run. This would > > avoid a smashup if for some reason EMC "forgot" to move Z up. (This > > has never happened...) > > > I was thinking to link it to a specific value (+/- small variation) of > ppmc.0.encoder.02.position (I know Stuart is using the PPMC on this > machine) > but if the axis somehow got "unhomed" this > would allow toolchange at the wrong position. Requiring the home switch > to be tripped > is a GREAT idea! > I think I like your idea for this as the home switch I am using for Y and Z is a long cam instead of a point cam. This would give me too long of a position to have the home switch opened (the home/limit switches are normally closed). This made me scratch my head for a few minutes while trying to set up homing. I looked at the ppmc input and saw it was closed all the time while the machine was no where near the home switch. I will have EMC verify both the machine is homed pin and a position from ppmc. I will home the machine and use an offset to adjust the home/tool change position. I will use that offset value as my check value for verifying the tool change position. The spindle servo amp is a true servo drive. The speed control is +10 volts for max clockwise spindle speed and -10 volts for max counterclockwise spindle speed. It has an encoder on the spindle motor with AB feedback to the amp. It does not have an index pulse (we have not found one). It may have an index pulse out of the spindle motor encoder but it is not wired in. With a two speed gearbox the index pulse would not work for accurate spindle positioning. I will install an encoder on the spindle. > > Jon > > > ------------------------------------------------------------------------------ > This SF.net Dev2Dev email is sponsored by: > > Show off your parallel programming skills. > Enter the Intel(R) Threading Challenge 2010. > http://p.sf.net/sfu/intel-thread-sfd > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users > -- dos centavos ------------------------------------------------------------------------------ This SF.net Dev2Dev email is sponsored by: Show off your parallel programming skills. Enter the Intel(R) Threading Challenge 2010. http://p.sf.net/sfu/intel-thread-sfd _______________________________________________ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
