Adjustable Thread Ring Gage Calibration

C

caseright

#1
I send my thread ring gages out to an accredited lab and they are calibrated using a master setting plug. The question that I always have is when the rings come back adjusted . How do I know how much they had to adjust them “since it’s a feel thing” and how do I prove to an auditor that this condition did not effect the products we have been producing with this gage since there is no before and after results? Is there a way to verify the amount they adjusted them?:confused:
 
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Stijloor

Leader
Super Moderator
#2
I send my thread ring gages out to an accredited lab and they are calibrated using a master setting plug. The question that I always have is when the rings come back adjusted . How do I know how much they had to adjust them “since it’s a feel thing” and how do I prove to an auditor that this condition did not effect the products we have been producing with this gage since there is no before and after results? Is there a way to verify the amount they adjusted them?:confused:
Any calibration expert who can help?

Thank you!!

Stijloor.
 
K

kixxy

#3
I send my thread ring gages out to an accredited lab and they are calibrated using a master setting plug. The question that I always have is when the rings come back adjusted . How do I know how much they had to adjust them “since it’s a feel thing” and how do I prove to an auditor that this condition did not effect the products we have been producing with this gage since there is no before and after results? Is there a way to verify the amount they adjusted them?:confused:
When using master setting plugs all your doing is adjusting them into the correct tolerance band, when calibrating and adjusting them you dont just go for feel its more if the Go enters fairly tight and the no/go does not enter then you have a correct gauge.

As for "how much it was adjusted" you would have to ask them to record that infomation and apply it onto your certifcate.

But if i rember correctly they may have stopped doing Adjustable ring gauges to ISO 17025 due to ovality issues this would have to be cleared up by someone else on the forum who can shed anymor elight on that subject.

Hope this helps
 

ScottK

Not out of the crisis
Leader
Super Moderator
#4
Can you ask your accredited calibration house to provide you with before and after data?
The last place I worked had a ton of adjustable ring gauges, but I had a guy to handle all the calibration stuff for me so I don't know off the top of my head.
I'm still on good terms so I'll ask him.
 
K

kgriff

#5
As we use a lot of adjustable thread rings where I work, I have often pondered this question. I am the lead calibration guy, so I am the one doing the adjusting. So far, I have not found a good way to quantify the amount of adjustment made. We have gone to using mostly hilo type set plugs to take out some of the operator "feel" that is required when using truncated set masters. This provides us with more reproduceable results, but still does not address the question of "How far out was it?"
The best I've been able to come up with is to calibrate the hilo master, recording the measured size of both the hi and lo sections. Then, if the ring stops on the lo, for example, I can know how far undersize it was. If it doesn't stop on the hi section I can know that it is at least that amount oversize. Unfortunately, with an adjustable ring, there's no way that I know of to measure the actual pitch and minor diameters.

One thing you need to be aware of, though, is that if you change vendors, most, if not all, of your adjustable rings will have to be reset because the new vendor will be using different set masters of slightly different size than the old vendor. I would recommend finding a vendor that has one of two things; 1. A very experienced thread ring guy or 2. Uses only hilo set masters. Without a very experienced thread guy (i.e. one that has been doing it for many years and does very little else) your chances of getting reproduceable calibration and resetting results are pretty slim.
 
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