Re: Improved Accuracy Tools

From: Christian_Nelson/
Date: Wed Apr 14 1999 - 21:32:26 EEST

Please give us more information about this project.

- What was the size of the tool?
- How long did it take to build and cast two sets of tools?
- Do you need to build two itterations for every tool, or can you use the
scales values from this project for future projects?

Thank you,

Christian Nelson (MR ALBIN A HASTBACKA) on 04/14/99 05:35:55 AM

cc: (bcc: Christian Nelson/DTM)
Subject: Improved Accuracy Tools

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-- [ From: Al Hastbacka * EMC.Ver #2.5.3 ] --

When making injection molding tools, one of Sanders customers has found
a way to improve on the very high accuracy of the Sanders Model Maker II
(best accuracy of the commercially available US RP systems).

This is how it was done..

1. Fabricate the tool pattern on the ModelMaker II
2.Send it to NDM for fabrication of the tool
3. Measure the resulting tool
4. Resize the CAD file to compensate for the measured errors
5. Fabricate the second tool pattern on the ModelMaker II keeping all of
the configuration files as they were in step 1.
6. Send the second tool pattern to NDM for fabricating the tool in
stainless steel
7. Measure the second version of the tool

The measurements of the second tool were found to track within 1/2 to
one mil of the original CAD file.

Al Hastbacka

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