Posts: 245
From:St. Marys, PA
Registered: Sep 98

posted 23 March 2001 09:17 PM               

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Standard Rule of Thumb:
Most accurate gage for checking an ID for accuracy: CMM vs Sunnen Gage vs Plug Gage. Any thoughts?

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Posts: 622
From:Lapeer, MI USA
Registered: Oct 2000

posted 24 March 2001 07:01 AM               

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I'm not familiar with a sunnen gage but I would tend to choose the CMM over a plug gage. When using a manual plug gage there is a higher degree of operaror bias. MHO

ASD...

[This message has been edited by Al Dyer (edited 24 March 2001).]

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Posts: 6
From:Mentor, OH, USA
Registered: Mar 2001

posted 24 March 2001 06:14 PM               

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I need to know the application (size, tolerence)to recommend the best method. Typically for checking parts the CMM or the Sunnen are good for +/- .0001". Some Cmm's can do better then others. In a production application the Sunnen wins hands down. If you are trying to calibrate plain ring gages, I use a Federal internal comparator. our uncertainty is +/-.000009"+1.5 X L.

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Posts: 46
From:Romulus, MI, USA
Registered: Feb 2001

posted 26 March 2001 02:46 PM               

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Of the 3 instruments you mentioned I would choose the Sunnen gage. As was mentioned the plugs have more operator bias than the Sunnen or the cmm. Recent uncertaintity analysis on one of our LK cmms was .000182 x 2.1 L. We have a sunnen gage and I can attest That they are better that the other two.

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