Re: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw

----- Original Message -----
From: "Smoke" <gordonr@...>
To: <CAD_CAM_EDM_DRO@yahoogroups.com>
Sent: Wednesday, August 15, 2001 12:02 AM
Subject: Re: [CAD_CAM_EDM_DRO] Re: Digitizers, Renishaw


> Want to try building something like that Jon? :)
>
> Smoke
>
>
> >> Wouldn't it be cool if someone could come up with a really tiny side
> >> scanning radar system that would work on these little machines. All
> you'd
> >> need to do is runa a single pass across the part from above and the
> >> sensor(s) would be able to detect all the minute variations of the
part.
> >> Then all, you'd need is to covert the image into 3D, import it to Rhino
> or
> >> something other program to build an .stl, .dxf or whatever file and
then
> >> send that to your software used for generating the gcode.
> >
> >Radar clearly won't work for this, as the waves are WAY too big.
> >You can't even measure a swimming pool with conventional radar
> >(10 GHz and under) as that is only a few wavelengths wide.
> >
> >Light, however, is a pretty good wavelength. Lasers produce coherent
> >waves, which may not be necessary for this purpose. but, they are
> >also bright and collimate easily. if you pulled the rotating mirror
> >assembly out of a laser printer, used a 5 mW 650 nM wavelength
> >laser and mounted it all on a carriage that could traverse vertically
> >while the mirror swept the beam horizontally, you could do a pretty good
> >job. You could have a camera that picks up the point where the laser
> >hits the part, and solve the geometry pretty easily with one beam
> >hitting one point and showing up at one point on a camera.
> >
> >Jon
>
>
>
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