Re: Stupid Home SW location vs Limit SW location question..

Yes, you would only have one home switch per axis. Many commercial
machines will have three switches per axis. Two over travel limits,
one at each end of travel. And one home switch somewhere in between
the limit switches.

I'm not sure the over travel switches should work like an e-stop.
A simple over travel indication doesn't need that, does it? If an
over travel indication shut the whole machine down, how will you
move the axis off the over travel position? Like when you
accidently jog to over travel position, if that became an e-stop
condition, how would you get the axis back in "safe" territory since
the axis drive would be disabled?

Doug



--- In CAD_CAM_EDM_DRO@yahoogroups.com, David Paulson
<stlspply@s...> wrote:

> Those switches should be called over-travel limits. They are to

be a saftey

> shut down if something has gone wrong to prevent damage to your

machine.

> They should work just like the e-stop. You should have only one

home switch

> per axis.
>
> -----Original Message-----
> From: doug98105 [mailto:dougrasmussen@c...]
> Sent: Saturday, March 22, 2003 7:30 PM
> To: CAD_CAM_EDM_DRO@yahoogroups.com
> Subject: [CAD_CAM_EDM_DRO] Re: Stupid Home SW location vs Limit SW
> location question..
>
>
> --- In CAD_CAM_EDM_DRO@yahoogroups.com, "Lee Studley"
> <indigo_red@q...> wrote:
> > Hi,
> > I've recently heard some conflicting information and wanted to
> find
> > out where the real people place their home switches? 1/2 way
> trough
> > the axis travel, or just before the limits at one extent, or

where?

> > Thanks, Lee
>
> IMO, it makes no sense to put them anyplace except at the exteme
> ends of travel. One of my commercial machines "homes" at the NE
> corner, the other at the SW corner.
>
> All the moves away from home on the NE machine are negative signed.
> Just the opposite on the SW homed machine.
>
>
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