Re: Repeatability of Home switches

--- In CAD_CAM_EDM_DRO@yahoogroups.com, CL <datac@l...> wrote:
> Torsten wrote:
>
> >When I was looking at some suitable home switches I found that
> >they had a rating of the switching speed in microseconds.
> >I would assume a home switch would have to be fairly fast at this
> >to ensure good repeat of positions.
> >Some I looked at where rated at 35 MicroSec would this be fast
enough?
> >
> >
> I'd be hard pressed to say that switching "time" matters much at
all for
> your typical home switch application....It could have some affect
if
> your goal is to "hit" those switches at a fast speed, thus needing
very
> quick recognition. But, all said, It will trip when it trips, and
how
> "routinely" it trips is important.
>
> Repeatability is what is important . It is important that no matter
how
> many times you hit the switch ( at similar speeds ), that it always
> "comes back" to the same numbers. I can tell you that with all the
extra
> work ( and sometimes money) of using Proximity or Optical type
switches
> ( power supply, wiring, contact patches...), It might not be even
worth
> it. I've had to troubleshoot bad proximity switches that took a lot
> longer than to just take a meter and check a mechanical switch....
That
> L.E.D. is NOT always telling the truth !
>
> The typical Cherry "Snap" switches I use, always are within .0003".
> Heck, the temperature in the room at any given time can affect the
> "actualitys" more than that. So, I've found these the most
economical
> and trustworthy for me. Easy to check... Just set up a dial
indicator on
> the axis and send into the switch about 50 times... You'll get a
good
> idea if the switch is accurate enough or not by then.
>
> Of course, it all depends on your specific needs, desires and wants.
>
> Chris L