Calibration Frequency of Thread Gages use for Aluminium and Stainless Steel Products

D

daniel

#1
I am interested to obtain recommendation of the number of uses of thread gages before re-calibration for stainless steel and aluminum products respectively.
 
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Mikishots

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#2
Re: Calibration Frequency of Thread Gages use for Aluminium and Stainless Steel Produ

I am interested to obtain recommendation of the number of uses of thread gages before re-calibration for stainless steel and aluminum products respectively.
Manufacturer's recommendations. Without more info, it's very hard to answer with any more detail.
 
D

daniel

#3
Re: Calibration Frequency of Thread Gages use for Aluminium and Stainless Steel Produ

Manufacturer's recommendations. Without more info, it's very hard to answer with any more detail.
I am running a calibration lab. I am looking for the best method to recall thread gages for re-calibration: by fixed calendar period or by the number of uses of the thread gages.
If the recall is done by the number of uses I wondered if it should be material oriented. I could not find manufacturers recommendations.
 

BradM

Staff member
Admin
#4
Re: Calibration Frequency of Thread Gages use for Aluminium and Stainless Steel Produ

I am running a calibration lab. I am looking for the best method to recall thread gages for re-calibration: by fixed calendar period or by the number of uses of the thread gages.
If the recall is done by the number of uses I wondered if it should be material oriented. I could not find manufacturers recommendations.
A good question. All I would suggest is data is our friend. :)

Do you have sufficient data on the thread gauges as far as what kind of wear was found when they were verified? If they are on the same interval with approximately the same wear, then you could assume (at least initially) that you could base it on calendar period. If you have the same interval with significantly different wear/tear, then it might be better to base off of uses (or department/ technician/ etc. use).
 
#5
Re: Calibration Frequency of Thread Gages use for Aluminium and Stainless Steel Produ

I am running a calibration lab. I am looking for the best method to recall thread gages for re-calibration: by fixed calendar period or by the number of uses of the thread gages.
If the recall is done by the number of uses I wondered if it should be material oriented. I could not find manufacturers recommendations.
Daniel: I had exactly this question many years ago. We machined a lot of "303" stainless (not sure what it is in the USA) and tapped it with a 3/8 UNC thread (or similar size). We found that at the rate we manufactured these parts and gauged them, the first few turns on the thread plug gauges wore significantly. We found out because we had a reject on a supplier's parts and his gauge was new/calibrated! Humble pie eaten that day!

So,our machine shop went to dedicated gauges as part of the tooling package for the stainless steel parts (we also machined a lot of alum alloys) and were recalled for cal. on a use basis and we derived the data from the cals. The small costs involved saved a huge amount of other problems!
 

Project Man

Involved In Discussions
#6
Re: Calibration Frequency of Thread Gages use for Aluminium and Stainless Steel Produ

I am interested to obtain recommendation of the number of uses of thread gages before re-calibration for stainless steel and aluminum products respectively.
We have side stepped this question (to a certain extent) by only using TiN coated gages. The gages are certified with the coating so when the coating wears off the gage is out of calibration.
On jobs that are long running or known to have a high wear risk, we include tool inspection intervals in the work instructions.
 
A

AndrisSkulte

#7
Re: Calibration Frequency of Thread Gages use for Aluminium and Stainless Steel Produ

Ditto what ProjectMan said. Seeing the TiN coating wear off makes it easy to ID when the gage has worn significantly. Our in-house gage lab would also check the thread plug with a meas over wires when it was returned back in from the floor.

Rate of thread plug wear is very much use dependent. Are your threads tapped to the larger size of in-tol? Are the parts clean? Thru-holes instead of blind? Gage lube used? Then the gage will wear much better than dirty blind holes with burrs on the threads where the operator runs the tap in until it bottoms + 1/2 turn to meet his min thread depth.
 
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