CAD CAM EDM DRO - Yahoo Group Archive

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

Posted by dave engvall
on 2000-11-15 21:58:08 UTC
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 ?)

Discussion Thread

Alan Marconett KM6VV 2000-11-15 15:31:40 UTC Re: digitizer arm, w/ encoder? ballendo@y... 2000-11-15 21:50:54 UTC Re: digitizer arm, w/ encoder? dave engvall 2000-11-15 21:58:08 UTC Re: [CAD_CAM_EDM_DRO] Re: digitizer arm, w/ encoder? Alan Marconett KM6VV 2000-11-16 00:19:44 UTC Re: digitizer arm, w/ encoder? dave engvall 2000-11-16 07:55:29 UTC Re: [CAD_CAM_EDM_DRO] Re: digitizer arm, w/ encoder?