Re: [CAD_CAM_EDM_DRO] Reed switch for limits - anyone done it?

Magnetic fanatics:
I liked Jan's comments...but carrying that a little farther...I played a
little with hall effect devices and they looked pretty good for home
switches. I did not use them because I could not isolate the magnets
effectively from the swarf. Big furball indeed!
If you can fix that problem by physical isolation that all should be well.

dave

On 8/15/02 7:59 AM, "JanRwl@..." <JanRwl@...> wrote:

> Ken: Perhaps very obvious, but make certain the distance between the
> magnet's and the reed switch's "long axes" will not vary, as this will change
> the "point of firing" considerably. A reed-switch can not be expected to be
> "repeatable" in an installation like this closer than a few tens of
> thousandths, so relying on it for a "HOME switch" is dubious! BUT, for
> "safety cut-off", it can be very reliable, of course, the contacts being
> hermetically sealed, and all that.
>
> HOWEVER, be sure you ONLY switch "logic levels" and not "stepper winding
> current" with the reed-switch, else it will become one strange piece of metal
> in a glass tube, not two!
>
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