Re: 3D digitizing

From: Peter Blacklin (
Date: Thu Oct 18 2001 - 16:24:07 EEST

Dear Jeff,

If I can add some suggestions, if you have to measure the parts and the
internal dimensions are imprortant then a CAT scan (the medical side of RP)
should be able to help.
Generally I have found that a failure analysis will give you more
information and identify the solution. This is what I am called upon to do
in a lot of cases.

If you are looking at the mirco picture the probelem could be more macro.
You can solve the dimensional problem but not the fundamental problem which
can bit you with product liability. I would suggest a broader view of the
problem "in context" (a phrase highly over used).

Getting the outside view doesn't take things as fixed or must have, so the
problem and the solution are more readily identified. Then comes the
teaching and selling of the solution.

Hope this helps.

Pete Blacklin
Optimum Solutions Inc.
410 730 3371 Tel.
443 756 7775 Cell
954 212 2295 E-fax

----- Original Message -----
From: "Jeff Katz" <>
To: <>; "'RP Mailing List'" <>
Sent: Wednesday, October 17, 2001 1:18 PM
Subject: 3D digitizing

> Hello RP-MLers,
> I have a question about 3D digitizing. I have a client who is having
> trouble with the process control on some extrusions. The extrusions are
> about 14" long, and are "C" shaped in cross section, so there is only a
> narrow opening along the length of the extrusion. There are a couple of
> secondary operations; the extrusions have an opening routed out of the
> center of the piece, perpendicular to the length. An insert is then
> sonicly welded into the opening, and then two endcaps are sonicly welded
> onto the ends. We suspect that these secondary operations are causing
> deformities which is negatively impacting performance. In order to
> properly analyze this, we would like to do comparisons of acceptable and
> defective assemblies and compare the two. Questions:
> 1. What methods can yield accurate internal dimensions when the width of
> the opening is smaller than the internal dimension?
> 2. Once two 3D models have been created, is there a way to overlap the
> and call out the differences using color gradients or some similar method?
> 3. What type of data is created? Could it be exported to IGES?
> Any shops that have relevant capabilities, please contact me directly via
> e-mail. Thanks.
> Jeff Katz
> President
> The Online Marketplace for Rapid Manufacturing
> Fast, Free, Secure
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