Re: [CAD_CAM_EDM_DRO] Re: Home/Limit switches : Micro switches or optical interrupters?

Ed,
You better be machining non-ferrous materials exclusively, if you're
mounting magnets on the table, or figure out a way to keep chips and
cuttings from accumulating on the magnets. I have that problem with my
magnet coolant mister, and that's not critical at all.

Marv Frankel
Los Angeles

----- Original Message -----
From: "eferg2001" <eferg@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Tuesday, October 01, 2002 12:19 PM
Subject: [CAD_CAM_EDM_DRO] Re: Home/Limit switches : Micro switches or
optical interrupters?


> Has anyone used magnetic reed switches? They are sealed and you
> would have no mechanical contact with the switch - just mount a
> magnet on the table. Not sure about the repeatability for use as a
> home switch, but should make a good limit switch. They are not
> overly sensitive to stray magnetic fields (such as a magnetized tool)-
> the magnet nees to be very close to close the switch.
> Ed Ferguson
>
> > I am slowly but surely progressing on my servo CNC conversion and I
> > have come to the question of limit switches.
> >
> > Are most people using micro switches or optical interrupters to
> > determine their home position? What kind of repeatability in home
> > position is required/attainable?
> >
> > Micro switches seem like they would be easier to implement while
> > optical interrupter probably have greater accuracy and no moving
> > parts. Right now I am leaning towards optical interruptors with a
> > small tang mounted on my table to trigger the interrupter, but
> > thought the list might have some thoughts on why microswitches are
> > the greatest thing since sliced bread.
> >
> > TIA
> >
> > -Erik Reikes
>
>
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