Re: [CAD_CAM_EDM_DRO] Re: Repeatability of Home switches

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