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

I think most machines would be rotated back manually into the safe
area. I do not see any problem with a 'over ride' button as long as
it would let you jog in the correct direction only. This may not
even be appropriate with stepper machines, but with servo's I have
seen then run wild when there was loss of encoder signal.

> 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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