Threaded plug and ring gage calibration procedures

T

Timmer

#1
After a 6 month reassignment, I am back in our quality lab. In my absense the former technician, in a cost savings directed approach, decided to calibrate the threaded rings in house using a "master" 6G threaded plug for the corresponding ring. Well he never sent the "masters" out for certification and after I did, 5 of the 7 came back out of tolerance. For the threaded plug gages he attempted to use the 3 wire/micrometer method. In 6 months I can only find evidence of a handfull of out of tolerance plugs whereas in the past when I sent these gages out to an accreditated calibration lab, we would have numerous per month. I have some photocopied pages of ANSI/ASME B1.16M-1984, in particular appendix B which illustrates specifically conditions that our in house lab can not meet to properly perform these calibrations. I am asking if anybody out there in calibration land has any easy to get to procedures or documents that also show the proper calibration procedure. A meeting is scheduled here in 2 days in order to address the potential of having literally hundreds of threaded plugs and rings in our shop that may be out of tolerance. This does not give me a lot of time to purchase and receive documentation, so I thought I would try here for suggestions that may help. Thank you in advance for all replies.
 
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Wayne

Gage Crib Worldwide
#3
CarolX said:
I have seen this site suggested previously for MIL standards. Both times I went there and did a search for the identified standard. Both times I got 0 hits in the search.

If you really want the MIL standard for something why not go to the source: http://dodssp.daps.dla.mil.

This does require you to sign-up. This is mostly a validation process to assure that you could/should have access. Regardless, once approved all MIL standards are available in PDF format for immediate download at no charge.
 
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Wayne

Gage Crib Worldwide
#4
Timmer said:
... I have some photocopied pages of ANSI/ASME B1.16M-1984, in particular appendix B which illustrates specifically conditions that our in house lab can not meet to properly perform these calibrations. I am asking if anybody out there in calibration land has any easy to get to procedures or documents that also show the proper calibration procedure. ... This does not give me a lot of time to purchase and receive documentation ...
ANSI/ASME B1.16M is the standard that you should be using for metric thread gages. But photocopied pages? A common practice although not good form for a copyrighted document. This document is available from www.global.ihs.com in hardcopy only. Using an overnight courier and it can be yours in a day or two.

I thought that it would be available from the ANSI online store at http://webstore.ansi.org, but I just looked and they did not have it available in any format. If for some reason you do not like Global Engineering Documents, the ANSI store gave three choices of where to get the document. I chose this one only because I have previously used them.
 
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Hershal

Metrologist-Auditor
Staff member
Super Moderator
#5
In the short term, the ANSI is likely the best source.....for a longer term solution, join GIDEP so you have access to all the various procedures including military ones, which are certainly validated. I think the website is http://www.gidep.org and it is no cost.

One point about MIL-STDs.....they were retired about a decade ago.....

You don't mention whether you operate under a 9K or ISO/IEC 17025 QMS, or what kind of equipment you have for checking the rings and plugs (e.g. supermic), or what the environmental conditions are where the items are checked and how the environment is controlled.....those questions make a difference as to how the issues are handled in your upcoming meeting.

Hope this helps.

Hershal
 
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