Micrometer Calibration Using a CMM

S

Snaggy

#1
Please can someone confirm that you cannot calibrate a micrometer using a CMM and be within the requirements of ISO 9001 / AS9100.

We have a guy here who thinks that it is acceptable and he has managed to convince the management. However we have our annual third party audit coming up and I'm certain that if picked up on it we will fail.

Thanks in advance

Richard
 
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Michael_M

Trusted Information Resource
#2
As long as the device used for calibration is traceable to NIST, you can use the CMM for calibration, however I do not think it would be the best choice for the following reasons:

Speed: Gage blocks are a faster method to be able to check the range of the micrometer.

Anvil flatness: Setting the orient, alignment and origin would be cumbersome every time you moved the position of the micrometer.

I have used our CMM to calibrate tools, mainly because of size issue (our CMM can go to 18" and our gauge blocks cannot). Our CMM is calibrated by an outside calibration company so it is traceable to NIST.

I would also think the CMM may not be accurate enough to test .00005" accurately.
 
Last edited:
S

Snaggy

#4
Many thanks both of you for taking the time to answer.

The CMM is calibrated by an outside company and that calibration is traceable, the resolution of the micrometers are standard, 0.01mm. The CMM has a repeatability of 0.002mm (so not accurate enough?). However my main concern was that the CMM wasn't an acceptable method of calibrating a micrometer, and as both of you have said that there doesn't appear to be an issue with it, then that will do for me. I will double check it status as per Clause 7.6.

Again many thanks
 
#5
Please can someone confirm that you cannot calibrate a micrometer using a CMM and be within the requirements of ISO 9001 / AS9100.

We have a guy here who thinks that it is acceptable and he has managed to convince the management. However we have our annual third party audit coming up and I'm certain that if picked up on it we will fail.

Thanks in advance

Richard
Richard, it's not likely to be a "failure" issue at the audit, frankly. It might raise an eyebrow if the auditor is familiar with the limitations of the cmm and other factors of the micrometer, but it is highly unlikely to be anything much.

The fact is, you can "calibrate" a micrometer with a cmm! Is it as quick as using a length bar or a set of gauge blocks? No. Is it as accurate, not very likely, for all the previously stated reasons. But that won't stop you at an AS audit!
 

Kales Veggie

People: The Vital Few
#6
Please can someone confirm that you cannot calibrate a micrometer using a CMM and be within the requirements of ISO 9001 / AS9100.

We have a guy here who thinks that it is acceptable and he has managed to convince the management. However we have our annual third party audit coming up and I'm certain that if picked up on it we will fail.

Thanks in advance

Richard
Sure it is possible, but at what cost, how much time, fixturing, alignment, interpreting data, repeatability.

So many questions.

Gauge blocks are so much easier, faster.
 
S

shamhaider

#7
Using right tool for right job is the key word...Gauge block are best choices when calibrating Mics/Verniers and widely adopted/acceped by Auditors...Bottom line..Keep it simple..
 
S

Snaggy

#8
I completely agree I would always use gauge blocks. However it is not me that does the internal calibration. I will get the grief should we come up short on our third party audit, even though I have told management that I believe that the method currently used is incorrect.
 
#9
I completely agree I would always use gauge blocks. However it is not me that does the internal calibration. I will get the grief should we come up short on our third party audit, even though I have told management that I believe that the method currently used is incorrect.
I'm not sure you will "come up short" during an audit, frankly. No-one can tell the organization a calibration has to be done conventionally... It really isn't likely to be a big deal, IMHO.
 

Big Jim

Super Moderator
#10
I'm not sure you will "come up short" during an audit, frankly. No-one can tell the organization a calibration has to be done conventionally... It really isn't likely to be a big deal, IMHO.
Keep in mind that the standard does not prohibit companies from doing things in an unconventional manner. They can choose to be stupid and find ways to meet the requirements in a manner that is more time consuming and less cost effective.

I would think that some auditors would be more amused than annoyed. I would be amused to run into such a plan.
 
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