33K6-4-427-1

[MIRCS]

For those that are ex Navy....you will understand this. Just got a AFTO 22 approved that is going to stop gages +/- 0.5% or better being checked every 10%. Though only if it's not used as a standard to calibrate other gages. Haven't seen a 3112 yet so i think this is a good thing.

Also being changed is the fact of setting the UUT to nominal and reading the standard.....does not apply to the 10-10525 though.(It is however being replaced) No more limitations on gages that are in their tolerances. Just wish we could get gages....basic process gages from having to be excersized three times....they use em at a pressure setting....so it's just a waste of N2 for pnuematic gages.

[Old-Navy]

Just be happy we don't have to check them in the downscale direction....

[MIRCS]

Good point and I am happy about not having to check them downscale. That would make alot more out of tolerance gages.

[Old-Navy]

Oh yeah... I've just been DYING to NRTS something for Hysteresis...

[MIRCS]

I did get to NRTS something for hysteresis the other day....an Altimeter. I was so happy. I hadn't written a tag out for that in So Long, I almost wrote Survey and replace on it.

[Old-Navy]

"Survey and Replace".....  I sure do miss that phrase.

[Aaron]

Just out of curiosity, does anyone else out there cite the source data on the cal label for the stated accuracy of pressure gauges, torque wrenches, screwdrivers, thermometers, etc.?

[Aaron]

I can assure you folks that I shower daily.

The reason I ask is because of an unmarked change in 2014 that I came across a while back. We have contacted AFMETCAL and are trying to determine if the statement was changed in error or not marked in error. We haven't received a response as of yet.

[MIRCS]

What was the error Aaron???

[Aaron]

A sincere thanks for the reply MIRCS.

But skip it...it's not important.

There are better things to do than trying to force this stuff on people.

I think I'll just lurk like everyone else.

Back to work...

[Phys_dim]

OK, Gauges are calibrated IAW (Navy) NAVAIR17-35CR-WSY-1, (Air Force) TO 33L1-4-3961 and (Army) TBUSASG PHY 12:  Calibration Requirements for Pressure Gauges.

As per Appendix A, Section 2.  Supplement Information, Para 4. Second sentence states:

"Exercising is recommended for gauges used as standard to minimize the effects of hysteresis on a Bourdon tube or other pressure-responsive element and to maximize performance."

As far as checking every 10% test point, see Table 1, Test Sequence 1.0  Item b.

Hopefully you'll take this chance to research Calibration Requirement Documents (CRDs, to fully understand why you're doing what you're doing.

Have a sparkling day.

[Phys_dim]

InLikeFlynn

OK...you are SCARING me. 

First question: are you posting just so you can be the big man on the block?

Second question: I've heard of all these little critters, lemmings, jumping off these cliffs, just 'cause they do it that way, should you?

Third, a statement: PMEL, Precision Measurement Equipment Laboratory, what part are you having a hard time understanding? 

PMEL technicians are probably the smartest group of people I know, but when someone like yourself make erroneous statement "Checking the gage in the way the customer uses them" I kinda get worried."  Just 'cause I saw some dumbass blow himself up using the wrong meter to check a live GCU...the procedure told him which one to use, or how about the dumbass that inflated a tire using a Hipack...8000 psi in to an aircraft tire, let's just say he's DEAD also...do you want to be known as the PMEL tech that did it "the WRONG way"?  I can go on and on about what the customer does....OUR job is to make sure what we calibrate is done by the numbers...there are reason for US to do this!

[Velasco]

I 100% agree that excercising 3 times should not be done on AC scales and pressure gages because they are not used that way. They need to be accurate the way they are commonly used, not the optimum way that PMEL can calibrate it too.

BTW how many people excercise the 3682 King before using it? You know I checked it out once, and it does make a difference in accuracy.

[ck454ss]

Im kind of the "New Kid on the Block" with this forum but I have to agree and disagree with what is being said.  I understand the point of exersizing a pressure gage and not exersizing.  The main reason for calibration procedures is to ensure uniformaty in a calibration however it is done.  It is also calibrated in a way to ensure the greatest accuracy and repeatability of readings.  I know I was tought in PMEL that if I cant repeat a reading than the reading isnt any good.  If calibrations were done on equipment how Calibration Techs think they are used I would hate to see how much variation between techs and labs there would be.  As a customer I would wonder who was right or who was wrong.  People have stated the customer doesnt flex the the pressure gage before they use it so why do it.  What if that pressure gage is used used from no load to 90% load a hundred times a day.  Do you always know how a gage is used or is going to be used?

[docbyers]

He might be the new kid, but he makes a good point.  My chief at Ramstein said almost the same thing, verbatim: "You don't know how the customer uses the gear, so calibrate it by the procedure, every time."

I also figured I was just a young buck sargeant, and the K-procedure writer was probably a lot smarter than I was, and had thought about some of those things, like how a Simpson 260AFP-1 gets pegged by some E-1 comm troop because they never remember to put the knob on the right range setting before running a few hundred volts through it...

When we did torque wrenches at F.E.Warren AFB, we always exercised them 3 times- something about "warming up" the spring inside, gave you reliable, repeatable readings.  God only knows what the missile techs did with them when they left the shop, but when they left the lab, they worked fine.