While working at Kelly AFB, PMEL Lab in San Antonio for Collins International. Our QA used a 4 coin system to determine what items got picked for QA and every 32 itme got picked if the coins did not get you picked.
Can anyone tell me where I can find this written up or another method for determining a sampling for my quality system.
David Minesinger
KRS
Kwajalein Atoll.
This used to be the old USAF method of selection, and used to be in 00-20-14. However, at least at non-depot labs, the USAF uses the PAMS algorithm for selection.
Mike
I do not have access to AF PAMS.
How do I go about setting up a sampling system that's fair. The Army regs say we have to pull samples once a quarter. But, not how to pick the sample or what to do if the sample fails. I'm trying to work with the Lab Supervisor and Mangaer here to do the system I'm formilure with.
Any one got an older copy of TO 00-20-14 or can point me in the right direction for setting up a system.
PapaBear
Well, the old 4 coin system basically worked like this..
Each item was placed on the QA's bench, was 100% inspected (wiring, fuses, cracked knobs, loose screws, etc.) then four coins were shook out of a Yahtzee cup :-D . If 4 heads came up, it was a quality review. This gave a 1 in 32 chance of the QR coming up.
Now, back in the '80's when there were no computer aided devices, the 1 in 32 was technician dependent, so meticulous records had to be kept on each technician, so if they managed to slide 31 items past, the 32nd would be automatically selected, thus ensuring all technicians would be evaluated.
I hope this helps..finding a 25 year old copy of 00-20-14 would probably be pretty hard.
Mike
Minor correction....
QuoteIf 4 heads came up, it was a quality review. This gave a 1 in 32 chance of the QR coming up.
The odds of 4 heads out of four coins is actually 1 in 16 (6.25%).
Quote from: dminesinger link=topic=1062. msg11208#msg11208 date=1212891570
I do not have access to AF PAMS.
How do I go about setting up a sampling system that's fair. The Army regs say we have to pull samples once a quarter. But, not how to pick the sample or what to do if the sample fails. I'm trying to work with the Lab Supervisor and Mangaer here to do the system I'm formilure with.
Any one got an older copy of TO 00-20-14 or can point me in the right direction for setting up a system.
PapaBear
Being a long time ARMY calibrator I can shed light on the QA audit program. TB 750-25 says once quartely and states to check the most frequently used equipment.
on arrival, unless carrying QA results from last post a Technician was audited once weekly for 3 quarters then on the 4th quarter if no deficiencies were found he moved to once per quarter. If they had failed, the weekly stayed until three quarters were completed consecutively. Ultimately if you couldnt qualify you would move to a different area and then QMP or reclassify.
The devices to be audited consisted first of the shop standards or supporting equipment that were calibrated in thier area of responsibility.
Then after a year of no deficiencies quarterly, lets say DC Low. They would move to another area say Microwave and start over with weekly audits and so on throughout the shop. This data was part of the smith file and everyone carried it with them to next assignment.
As you can see the intent was to qualify a tech on the equipment in set configuration AN/GSM 286/287 or Reference Lab. Depending on configuration of the site they could attend the advanced D7 course and eventually get to primary level work at Huntsville.
This was originally developed to keep a structured percentage of technicians technically and tactically proficient and was not rank dependent.
Thus the deployable mobile team could be comprised of individual personnel from many sites in an AO without impacting any one shop.
Thats why we always worked under a single company as detatchments. The top always knew who was at what level.
All QA documents were maintained by OPS at the command HQ.
SKhagen,
Thank you. Sytem change a whole bunch from when I was in the Army. I went to Lowry in the fall on 75 and graduated in Jun 76, 34 week school then.
went to Camp Carroll in Korea and was placed on an A level team for 2 years.
only time the teams got qa'd was when QA left Camp carroll and hit us. About once a quarter.
Was with Bill Lambert and Jim Nokamora(sp) and EP Williams back then. And a character named George Waters.
PapaBear
Quote from: OlDave on 06-08-2008 -- 08:34:04
Minor correction....
QuoteIf 4 heads came up, it was a quality review. This gave a 1 in 32 chance of the QR coming up.
The odds of 4 heads out of four coins is actually 1 in 16 (6.25%).
yep 2x2x2x2=16
I actually have a copy of the old multi-level sampling system section of 00-20-14 (coin method).
I emailed it to ya.
Mike,
Got it. Thank you. Maybe you'd like to share the file here.
PapaBear
Apparently it is too large to upload onto here...unless there is another way.
If its a pdf you could press print screen on each page and paste into Paint then save as a jpg. Or any document format that is in a page by page layout. Then upload each file individually. Also try e-mailing the admin address on the front page. Perhaps Hoopty can help ya.
Quote from: ventura on 10-01-2008 -- 17:41:33
Quote from: OlDave on 06-08-2008 -- 08:34:04
Minor correction....
QuoteIf 4 heads came up, it was a quality review. This gave a 1 in 32 chance of the QR coming up.
The odds of 4 heads out of four coins is actually 1 in 16 (6.25%).
yep 2x2x2x2=16
wow so far back that I already forgot about the coins. I do remember that if you fail your sampling rate would drop to 3 coins, and if you keep failing to 2 coins and then to 1 coin
I found a formula in excell to simulate the 4 coin function.
type =RAND()*(16-1)+1 in any cell, then format that cell to number with no decimal places, and them press F9 to see the number change every time that F9 is press. you can write in your quality manual that everytime 1 comes up the instrument gets selected, for a 3 coin simulation change the formula to =RAND()*(8-1)+1 and RAND()*(4-1)+1 for two coins
http://www.random.org/coins/ fun way to flip whatever coin you want
nice website Jimmyc. I just flip a few dimes and many coins from other countries.