Will the Certificate of Accuracy that comes with thread gages satisfy ISO9001?

qcman

Registered Visitor
#1
Will the Certificate of Accuracy that comes with thread gages ( in this case Vermont) satisfy the ISO9001 standard for gage calibration ? Our calibration on thread gages is yearly for most and it's my belief that the manufacturer Certificate of Accuracy is enough to satisfy the standard for the first year.
 
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CliffK

#2
Will the Certificate of Accuracy that comes with thread gages ( in this case Vermont) satisfy the ISO9001 standard for gage calibration ? Our calibration on thread gages is yearly for most and it's my belief that the manufacturer Certificate of Accuracy is enough to satisfy the standard for the first year.
That should work.

But why one year? What's the frequency of use? What's the possibility of damage or other causes of inaccuracy?

Maybe you can stretch it more than a year. Or maybe a weekly, monthly or quarterly visual check is appropriate.

Set your interval according to the need.
 

qcman

Registered Visitor
#3
Yearly is the interval chosen based on our use. The reason for the question is the previous gage tech would have new thread gages certified by the supplier at an additional cost. I find this redundant and wastefully if it already has a cert.
 
C

CliffK

#4
Yearly is the interval chosen based on our use. The reason for the question is the previous gage tech would have new thread gages certified by the supplier at an additional cost. I find this redundant and wastefully if it already has a cert.
I'm inclined to agree.

How about traceability to national standards for the mfgr's cert?
 

qcman

Registered Visitor
#5
The cert says it is traceable. I was just looking at their site and it says standard cert provided and long form cert available at additional cost. The long form is what the former tech was paying the supplier for.
 
C

CliffK

#6
The cert says it is traceable. I was just looking at their site and it says standard cert provided and long form cert available at additional cost. The long form is what the former tech was paying the supplier for.
Gotcha.

What's the difference between the two?
 

qcman

Registered Visitor
#7
I will have to look at the long form certs we do have and see. The long form is something I would expect when sending them in for re-cert.
 

Stijloor

Staff member
Super Moderator
#8
The long form is something I would expect when sending them in for re-cert.
Hello qcman,

Absolutely! But you must specifiy that in the purchase order. That's not always done and then you end up with calibration records that may not comply with your calibration system requirements.

Stijloor.
 
2

20110108 Request

#9
A very reputable calibration lab's president told me that they always checked instruments from the manufacturer because, in most cases, the equipment was found to be out of calibration. This is why the phrase "be calibrated or verified at specified intervals, or prior to use" is in ISO 9001, 7.6.
 
#10
That's been my experience too. We had purchased some vernier calipers from a very, very well known manufacturer and didn't ask for a full certificate. On sending the calipers to a cal. lab. it was found that they were off quite a lot. It was the manufacturers way of 'grading' them, if you asked for a full cert. at time of purchase. The people who didn't ask for a cert. got the 'off spec ones' I'm sure.........

So, although it might seem more costly, the reality is this. You must know the condition of the items, so that you can make an infomred decision, based on data, about the suitability of the equipment for the task, then set a recalibration recall. If the equipment is 'close to the edge' (YES, circa 1972), then you might not get to the end of a year without a problem - of course it might have cost more than the certificate.

My advice - get the full cert from the get go. Your tech was correct! And by the way, ISO says you have to base your decisions on data (8 QM Principles) not cost........:notme:
 
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