Re: Opinions: Hall Effect (digital output type) as limit sw...

Hi,

If you are using a servomotor with an encoder that has an "INDEX"
output, you can get a very accurate "home" with any kind of home
switch.

The "INDEX" output is the accurate position; the home switch only
enables the index output and needs to accurate to only +/- 1/2 of a
motor revolution.

You can get the same effect by making your own single line "INDEX"
encoder and putting it on the leadscrew. This could be as simple as a
disc with a single small hole in it. A photo-interrutor will see it
and stop the motor accurately.

Mariss

--- In CAD_CAM_EDM_DRO@y..., JanRwl@A... wrote:
> Hall Effect switches have much too much hysterisis to even be
CONSIDERED for
> this application. A "Microswitch" is a fastly-more-
accurate/repeatable
> device.
>
> Better, perhaps, would be a carefully installed/adjusted photo-
interruptor of
> some sort.