Re: [CAD_CAM_EDM_DRO] EMC home/limit switch quality

Les,

Not sure if this would work, but, couldn't you just wire the index pulse
to the home input on the parallel port through a normaly open switch?
Every revolution of the encoder will put out an index pulse but the EMC
will not see it until the switch is closed. EMC would then read the next
index pulse through the closed switch.

Bill

>
> For homing I always used the method of detecting a home
> switch then reversing to the next index pulse of the encoder
> for accuracy. (tech80 boards) All my encoders have an index channel.
>
> I need to know where to stick these switches for emc.
>
> I read the archives some and am aware of the home offset
> parameter and the shared single home input issues.
>
> I just still want to use an index pulse for home as before so I
> don't have to worry about mechanical home switch repeatability but I am

not

> sure emc is set up to do this.
>
> If it is not... what if I logic anded a switch engagement
> with an nearby index pulse? So the mechanical switch would
> just enable the next index pulse detection for the single home input
> (without a direction change). Then offset to get off the switch and next
> axis.
>
> Sound like a plan?
>
> Do I need to do this or can emc deal with it soft?
>
> Thanks,
> les