Re: Digitizers, Renishaw

>
> --- In CAD_CAM_EDM_DRO@egroups.com, Doug Fortune <pentam@h...> wrote:
> >
> > "Roman Black" <fastvid@e...> wrote:
> >
> > > How about a vertical hanging probe, with
> > > like a disc at the top. The disc sits on/in
> > > a ring. The exact mech design I leave to
> > > the experts!
> >
> > How about instead a "jack", something like
> > Alan Marconett KM6VV <KM6VV@a...>
> > suggested:
> >
> > >The tips of the star are indeed conductive, but I'm thinking the
> three
> > >"arm" contacts need to be insulated from each other. 3 pole,
> single
>
> I would stay well away from electrical contacts.
> To get reliable conduction requires pref silver
> plated contacts, and high contact pressure and
> velocity. Switch theory is all old hat. Just
> lightly touching two contacts together will
> NOT give a reliable confirmation. Sometimes
> it will work, sometimes not. As you increase
> the voltage the contact detection gets better
> but arcing starts, which is a whole new problem.
> All pushbuttons, switches and relays are
> designed to have high velocity and good pressure
> at the contacts. You are not going to get that.
> :o) Opto's or other non-contact sensing is the
> best. Optos and circuit are maybe $10 tops.
> -Roman
>
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