On 24 January 2013 18:27, Gene Heskett <ghesk...@wdtv.com> wrote:

> On Thursday 24 January 2013 11:05:42 Todd Zuercher did opine:
> Message additions Copyright Thursday 24 January 2013 by Gene Heskett
>
> > Add a spring to your contact, to give it a degree of compression.
> >
> I did, in a previous design, mount the pcb on grommets so there was room
> for crush. but found it near impossible to get a consistent spring back.
> Or if off center, a consistent restoration to level.  a 4 grommet mount
> would have solved that, but the frame of that gage didn't have room.  So I
> wound up insulating the pcb being carved in a pocket of micarta, and
> g38.2'd the pcb I was carving, which worked very well indeed.
>
> Like T. Edisons & his light bulb, he found 10,000 ways it didn't work.
>
> All my current problems regarding this would go away if the switch
> hysteresis backup move would just do another 5 thou of back away anyway if
> it found the switch open when it checked instead of freezing in place and
> fussing with a big red error advisory because the switch was found to be
> already open as it started the back away move.  HINT, HINT.  IMO, the only
> error here is in the assumption that the home switch is mechanical, with
> several tens of thousandths on an inch, or in metric, possibly a whole mm
> of hysteresis.  Perhaps even a per axis keyword to make it work either way?
> Would seem to give maximum flexibility at any rate.
>
>
>
How about using a proper travel limit switch. The contact operates well
within the first mm, and then you can press it a further 5mm or so with no
ill effect. And on release the hysterisis is very short...

http://www.galco.com/buy/Eaton-Cutler-Hammer/E47BMS04
http://www.galco.com/buy/NTE-Electronics/54-438-BP

Regards
Roland
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