Re: Repeatability of Home switches

On my Drill/Mill CNC I always home the machine, then set a coordanant
offset (G54) to my parts 0,0,0. I have lost my position and re-homed
before. Just to be sure I checked my G54 offset. I have always been
within .002 from my setting. I am using cheap Radio Shack switches.

Jeff Davis
http://www.homecnc.info


--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Torsten" <torsten@g...>
wrote:

> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "mrgamber" <mgamber@c...>
> wrote:
> > What repeatability should I expect from home switches?
> >
> > I can get a Honeywell Hall Effect VX series switch in a standard
> > package that claims .005" repeatability. Can I do better with a
> > typical hall effect switch?
> >
> > The output on the switch is confusing, does sink mean that it is
> > coupling the supply voltage to the output? Or is it contact

closure

> > like a normal switch.
> >
> > link;
> >
> >

content.honeywell.com/sensing/prodinfo/solidstate/catalog/c20048.pdf

>
>
> When I was looking at some suitable home switches I found that
> they had a rating of the switching speed in microseconds.
> I would assume a home switch would have to be fairly fast at this
> to ensure good repeat of positions.
> Some I looked at where rated at 35 MicroSec would this be fast

enough?