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.