RE: [CAD_CAM_EDM_DRO] another limitswitch quest...

Ok optos are not good in a dirty environment for positional sensing, but
for limit switches... the slotted ones fail safe, i.e. if it gets crud in
it, it just looks like it has operated, giving you a nice indication that a
little maintenance with a cotton bud is required!

-----Original Message-----
From: Hans Wedemeyer [mailto:xyz@...]
Sent: 03 January 2003 14:35
To: CAD_CAM_EDM_DRO@yahoogroups.com
Subject: Re: [CAD_CAM_EDM_DRO] another limitswitch quest...


Thanks for the heads up about safety, I've been toying with a limit switch
(multipattern) idea for a while and
sounds like this is a good case for a "backup mechanical switch". It could
be arranged to activate
a few mil after the electronic switch.

Hans W


Bill Higdon wrote:

> Jens,
> I worked with this type of switch for many years in printers, X-Ray film
> changers etc. They are no good if in a dirty environment like Impact
> Prnters, Machine tools etc. Watching a printer slam dunk a head into a
> end stop is no big deal, but a mill slam dunking a tool into the platten
> or work piece is another story. And watching a Highspeed carridge move
> at warp 9 (40 meters per second)for 25 meters before hitting the end was
> really an awe inspiring thing (AWE S--T)
> Bill Higdon
> Jens Swales wrote:
> > hi all
> >
> > i was thinking of swap my mechanical microswitches to optos, fork-
> > stylys, that reacts when a object (nock, actuator or whatever) goes
> > in the led/transistor gap. does anyone know how this works in a shop-
> > environment, with all dust and dirt that sooner or later gonna cover
> > both led and transistor with a fine layer.
> >
> >
> > js
>
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OFF Topic POSTS: General Machining
If you wish to post on unlimited OT subjects goto:
aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if
you have trouble.
http://www.metalworking.com/news_servers.html

http://groups.yahoo.com/group/jobshophomeshop I consider this to be a
sister site to the CCED group, as many of the same members are there, for OT
subjects, that are not allowed on the CCED list.

NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM.
DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........
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