RE: [CAD_CAM_EDM_DRO] Re: hall effect as home switch

I agree with the choice of using micro switches. Halls will not be precisely
repeatable, have a dead band and are more expensive to implement. The
ultimate in precision is attainable using optic sensors (with adjustable
flags) which are cheaper than Halls but more than micros and also need a
small amount of electronics to run them. KISS (Keep It Simple & Sweet)

-----Original Message-----
From: afogassa [mailto:afogassa@...]
Sent: Thursday, June 06, 2002 4:58 PM
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: [CAD_CAM_EDM_DRO] Re: hall effect as home switch

--- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:
> Fogassa:
>
> Just MY ignernt opinion, but the "hysterisis" inherent in the use
of such as
> the Hall switch precludes it repeatability better than, oh, 0.015",
I'd
> guess. Too, a "microswitch" needs no "interface", while the Hall
effect
> switch reqires a DC supply, and at least a gate or transistor
to "watch" its
> state.
>
> A carefully/aka-skillfully-installed microswitch can be excellent,
and needs
> NO "interface" (if you don't count the wire between it and the
circuitry),
> and is vastly cheaper and inherently more reliable.
>
> If you install screws with lock-nuts to "push" the switch-lever,
and adjust
> that until it "fires" where you want, you may be surprised how
precise and
> repeatable it is!
>
> Jan Rowland, Old [deleted] who's BEEN there.

I'm having good results with regular microswitches, it repeats about
+-.0005" was just wondering if hall would be bettter.

Thank you all.


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