Re: [CAD_CAM_EDM_DRO] limit switches: mech vs proximity

re your Proxy switch .. proxys switches we use in the
plant are both mounted on ends and sides of the
machines we use the end one's are incased in steel so
they don't crash out .

One line that I work on (I am the millwright )has over
80 proxy or read switches on one station we can have
up to 300 or 500 switches per line.

You realy get to know robotic's fast on this stuff I
think using a spring would not work . All the proxy's
we use have reaches from .05mm to 8.0mm .

One would think that 8.0mm is lots of room to stop in
.Most of the units are air opperated and use e.stop
dump valves, but this also works on the servos which
control lead screws on other units that travel 5"per
sec

We have units that have to stop in .05mm or it would
not assemble the parts. That is close By the way the
arms a moving at at speed of 2'in 1.5 seconds. I hope
this helps somewhat.


John
--- ptengin@... wrote:

> In a message dated 11/19/2000 10:39:00 PM Hawaiian
> Standard Time,
> jmw@... writes:
>
>
> > . Maybe a
> > prox sw could be mounted on a spring mechanism to
> protect it?
> >
> > Voice of experience?
> >
> > Thanks very much.
> >
> > --Jack W.
> >
> >
> >
> Jack,
>
> You first need to define if you are setting up a
> home switch or a limit
> switch. A limit could be spring mounted as it need
> not define a precise
> location. It simply prevents the machine from
> "jumping the tracks". A home
> sensor should be set up rigidly to have any
> repeatability. I know large
> industrial limit switches such as Omrons or
> Honeywells can be accurate to
> with in .001 or .002". This makes for a decent home
> even when not combined
> with an index pulse. IMO
>
> Peter
> THRD, Inc.
>
>
> [Non-text portions of this message have been
> removed]
>
>
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