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  Measurement, Test and Calibration
  The correct way to read the gage is??

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Author Topic:   The correct way to read the gage is??
elbee
Lurker (<10 Posts)

Posts: 1
From:Mentor, OH
Registered: Jan 99

posted 08 January 1999 04:03 PM     Click Here to See the Profile for elbee   Click Here to Email elbee     Edit/Delete Message   Reply w/Quote
Hello everyone

Say that I have a part with a feature that is supposed to measure 0.111 +/- .001 according to the drawing.

The gage I am using to measure this has an accuracy of 0.0000

Would a reading of .1121 be acceptable? Would .1126? The argument here at work is (Eng.) the gage is capable of measuring to .0000 so we SHOULD take advantage of that and use tighter measurment. The other side (QA) says that although the gage is capable, the feature is only designed to .000 so nothing past the third decimal place should matter.

Is there any guidance out there on this?

Thanks

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Marc Smith
Cheech Wizard

Posts: 4119
From:West Chester, OH, USA
Registered:

posted 08 January 1999 09:57 PM     Click Here to See the Profile for Marc Smith   Click Here to Email Marc Smith     Edit/Delete Message   Reply w/Quote
Take a look at:

https://elsmar.com/ubb/Forum5/HTML/000027.html

I'll respond here as well (maybe tomorrow or Sunday) and I hope others will help here as well.

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Don Winton
Forum Contributor

Posts: 498
From:Tullahoma, TN
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posted 09 January 1999 07:26 PM     Click Here to See the Profile for Don Winton   Click Here to Email Don Winton     Edit/Delete Message   Reply w/Quote
elbee,

Welcome to the Cove.

I may be mistaken in this. The implied purpose of measuring to a significant digit in excess of the specification is to determine exactly what you are asking. IMHO, if the specification is 0.111 +/- 0.001, then 0.1121 is NONCONFORMING. To mirror Marcās suggestion, it is more important to meet the intent of the specification. Do not become caught up in the Īgoal=postā method of thinking.

quote:
The other side (QA) says that although the gage is capable, the feature is only designed to 0.000 so nothing past the third decimal place should matter.

I disagree. Ask your phone company when one minute equals one minute. Perhaps the QA department is more concerned with meeting the letter of the specification rather than the intent of the specification. Just a thought.

Regards,
Don

[This message has been edited by Don Winton (edited 01-09-99).]

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