Re: [CAD_CAM_EDM_DRO] Home /limit switches

you shouldnt need to stop the inputs to the drives
combine the index channel with a rough home switch to get a fine,
repeatable home signal and let the software back off its fixed distance
from there to set zero just a little bit away from the home reference
it should hit the same spot every time
see
http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/CIRCUITS/home-with-index.pdf

Brian

> I think the encoder has an index mark (ch. A, ch. B and I) but I don't
> think CNCpro can use it.
> I wonder if there is a way to use it. I don't quite see how I can get
> movement back to the index mark without building some kind of circuit that
> stops the input to the gekkos when the home switch is reached and the table
> backs up a set distance.
> I would have to set the back up distance to go further than the index mark
> and stop the gekko input, how, a transistor shorting the input from the
> software high or low as needed. This might be accurate if the homing speed
> was slow enough. I see this getting a lot more complicated than I thought
> it would be.
> Thanks Bob
> KB1FRW