Re: [CAD_CAM_EDM_DRO] Re: digitizer arm?

Aw come on Roger, I will bring over the beer and jeweler's scrwdrivers....
(grin)

Bill Kichman
103 Old Furnace Road
Cornwall, PA 17016-0643
tel/fax 717/270-0714

----- Original Message -----
From: "vrsculptor" <vrsculptor@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Friday, July 25, 2003 11:03 AM
Subject: [CAD_CAM_EDM_DRO] Re: digitizer arm?


> > Holy cats, I contacted a sales rep, who called me back a short
> while ago,
> > these things are $3500 list price!
> > For a few cheap rotary encoders, simple framework, glue electronics
> and
> > interface software, that sure is steep!
> > I guess if they were sold like PC game joysticks, they'd be
> cheaper...
> Bill,
> I went through that exercise before I bought mine. If you start to
> play with the actual geometry/arm lengths US Digital 4000 CPR
> encoders just wont give you the resolution you need. 360/4000 sounds
> like a big number until you work out just how small a rotary movement
> a .001 deflection makes at 12 inches. I looked at gearing to really
> spin the encoder up but even that didn't work. I don't know how
> Microscribe is doing it. The only thing that I can think of that
> gives you that number of clicks per revolution is a reolver and I
> don't know if you could fit that much electronics in a Microscribe.
> Faro makes arms that are that accurate with a 6 foot reach.
>
> A mystery... but I'm not about to take mine apart.
>
> Roger S
>
>
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