Re: Rapid Tooling

From: Steve Farentinos (
Date: Mon Feb 19 1996 - 21:19:12 EET

Carl Deckard wrote:

> I respond:
> Unrealistic expectations may be more of a factor in the acceptance of
> tooling via RP&M than a mismatch between capabilities and true
> requirements. Ask yourself:
> 1) Do I really need plus or minus 0.0002 inch (0.005 millimeter)?

Plus or minus 0.0002 inches is a tight tolerance indeed. We have been
inspecting tooling and parts on CMM's for ten years. I can tell you first hand
that even the most carefully machined parts will meet this spec. only on very
rare occasions. In the case of a complicated 3D parting line, the drawing may
ask for these tolerances and the machinist may claim to have delivered, but
verification can be the trickiest part.

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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