It is also beneficial to inspect threads by more than one way if possible. A second thread gage or method of gaging provides an extra layer of quality control. It is unfortunately all too common for manufactures to rely on one single gage to inspect thousands of parts only to find out after a rejection issue, that the gage was no longer in tolerance and the parts are all scrapped.
Functional size thread inspection with Gagemaker brand gages is fast, easy to use, affordable, and versatile for inspecting threads particularly when the thread sizes are very large. One set of thread pitch rolls can measure a range of diameters. Thread Gages over 8.00 inches are heavy, cumbersome to handle, expensive, and typically have long lead times to build. If not handled carefully they can be damaged or do damage to parts. They also require more space for storage. Shipping and handling costs for the calibration and maintenance of large gages must also be considered.
The Gagemaker PG-6000 and RG-7000 functional gages use two precision ground thread rolls that seat into the thread form and contact the thread at the pitch line. The gages are zeroed at a preset calculated thread size ( TDWIN Software ). Deviations from nominal size are read on the indicator.
Thread rolls are able to determine variations in form, lead, taper, and height all simultaneously just as the thread plug and ring gages do. The PG-6000 and RG-7000 are set using gage blocks, micrometers, or Gagemaker’s MIC TRAC measurement center. Thread ring and setplug masters are not required.
The PG-6000 Series gages inspect diameters of internal threads. The RG-7000 Series gages measure diameters of external threads.
Common pitches ranging from 4 TPI to 20 TPI of the UN Series, ACME, and Stub ACME, and 1.5mm to 4 mm of the ISO Metric thread rolls are in stock. Whitworth and 7° X 45° Buttress thread rolls are available with short lead times.
With the PG-6000 and RG-7000, thread diameters up to 24 inches can be easily and accurately measured. Measurements can be taken directly while the part is still on the machine or setup in an inspection area