Re: [CAD_CAM_EDM_DRO] Re: digitizer arm, w/ encoder?

ballendo@... wrote:

> Alan, list,
>
> The issue to solve with this probe, IMO, is how to allow 3 direction
> sensing while accomodating overtravel. This way you can treat it like
> a home switch. Probe 'til state change.(quickly) then retract and
> probe for position (more slowly). Just some thoughts.
>
> Ballendo
>
> >I wonder if a "photo-interrupter" could be used? A little deflection
> >would move the vain/tip out of the light path. Wouldn't give mills
> >of deflection, but could still be useful.
> >Alan
>
> Nice Idea!
>

Indeed it is!
First time I read this post I though Alan was suggesting something else...use the indicator gear to move a mirror...on to or away
from a sensor. i.e a led beam bounces off the mirror and is focused on a phototransistor. Might be more sensitive than the
photo-interrupter.

Dave

ps. the real trick will any device like this is to minimize the tangential deflection upon contact. (long bearing surface on the
probe ?)