CMM Band Width - How does band width relate to accuracy?

[Marc]

I've never heard of this - has anyone else here???

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Subject: Q: Band Lengths on CMM /Shibley
Date: Wed, 14 Apr 1999 14:11:13 -0600
From: ISO Standards Discussion

From: PPPQC
Subject: Q: Band Lengths on CMM /Shibley

We had a curious question brought to us the other day, the question was about our band width on our CMM. We believe it is . 0005." How ever being in a metal stamping environment, the question was "How does band width relate to accuracy"? I am afraid that I did not have the answer. For Calibration needs and the accuracy of collected data how important is "Band Width" and how does that relate to the question of shortening or lengthening the width itself?

Dan Shibley

I have programmed a touch probe CMM for years, and tried to keep up with the latest, but I have never heard of "band width." Do they mean volumetric accuracy? Precision? Repeatability?

I HAVE 3 CMM'S 2 OF THEM CNC AND IN 10 YEARS HAVE NEVER HEARD OF BAND WIDTH IN AND CONVERSATION OR DOCUMENTATION.

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[Marc]

I have asked a bunch of folks who are 'CMM Jockeys' and they have never heard of it either. They look at me like I'm weird (which may be part of the problem and may be true, but has nothing to do with the question....).

I'm gonna write PPPQC@aol.com and see if we can find out.