Re: [CAD_CAM_EDM_DRO] Re[2]: digitising arm

Alan Marconett KM6VV wrote:

> Terry, Ballendo, list,
>
> About twenty+ years ago, we had "sonic digitizers" (2D) for use in
> Radiation Therapy Treatment planning. PHD's would trace tumors an
> patient outlines into a compute to compute the treatment plans. It was
> made by SAC, Scientific American C.. ???, anyway, they also made 3D
> versions, and used a stylus which created a spark that could be heard by
> the "linear microphones" along each axis. Not an arm, but might be an
> interesting approach.

That's Scientific Accessories Corp., still in business as of 1-2 years ago.
They now DO have a 3-D version of this, without the nasty sparks, too.
I think they have something with different technology with an arm and
a stylus. It probably has better accuracy and resolution than the ultrasonic
devices.

Jon