Re: Standards

From: Steve_Farentinos (
Date: Thu Oct 02 1997 - 22:17:15 EEST

Marshall Burns wrote:

> George Sachs of Paradyme Systems (<>) was talking about
> getting something going on a benchmarking study last summer. More recently,
> Steve Farentinos at PML in Torrance has offerred his CMM for measuring models
> submitted to him with the source CAD files.

I didn't say much about how I planned to measure the parts in the study.

We have developed a piece of software that runs inside the Varimetrix CAD/CAM
program. The software accepts a point cloud generated by a digitizing device
(CMM) and registers the point cloud against the CAD surface or solid model of the
nominal part. This is an iterative process with a stopping rule that allows you
to find the "best-fit" position of the digitized point cloud with respect to the
model. The result is an inspection report in which the point-to-surface
deviations have been minimized.

I plan to use this approach in my study to find the best possible surface profile
tolerance for each measured part.

By the way, I now have solid commitments from 3D Systems and Aaroflex, and
tentative commitment from Compression, Inc. Are there any more takers?

Steve Farentinos
PML, Inc.
201 W. Beach Ave.
Inglewood, CA  90302
310 671-4345
310 671-0858 Fax
310 671-1862 BBS

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