Re: [CAD_CAM_EDM_DRO] Sensor for home in CNC machine

Take a look at Jameco.com they have some proximity switches for $15.00 that
work well. The have the tubular type that is easy to mount. They come with
about a 6' shielded cable.
Jim

----- Original Message -----
From: "Roy J. Tellason" <rtellason@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, February 11, 2004 9:07 PM
Subject: Re: [CAD_CAM_EDM_DRO] Sensor for home in CNC machine


> On Wednesday 11 February 2004 05:38 pm, zachary goff wrote:
> > I'm working on building a homebrew CNC machine and one of my design
> > features is to use reed magnetic switches for the home positions. I can
> > mount the switch permanently, and stick a small magnet along the table
and
> > easily adjust the home position, eliminating complex mounting solutions.
> > The repeatability is .1mm, not perfect but fine for my setup. Also, be
> > sure to look for switches with a built in led that tells you if it is
> > active, that way you know exactly when it will turn on, otherwise you
can
> > install your own led into the circuit.
>
> If you're talking about the kind which I've commonly seen which are
enclosed
> in glass tubing, I'd have some serious reservations about using them.
I've
> seen enough of them fail over the years, particularly in those
applications
> that involved high cycling, that I wouldn't consider them particularly
> robust. Note that when one fails, it can fail either open _or_ shorted,
> depending on how the glass fractures.
>
>
>
>
>
>
>
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