Practical guidance on gauging, calibration, standards, and shop-floor quality, from the DSN engineering team.
Sending a plug gauge for calibration should not feel like posting it into a black box. What the lab actually checks, which member wears first, how often to recall, and what the certificate should tell you.
Two steel blocks with no glue holding them together, and yet they cling like they were cast as one. The wringing film is old metrology, but doing it wrong quietly corrupts every stack you build on it.
Steel corrodes noticeably above about 60% relative humidity, and a monsoon shop sits at 80%. Storage, handling and the inspection that catches pitting before it reaches the gauging surface.
A gauge register is not a list of gauges — it is the system that keeps calibration, ownership, and recall under control. How to build one that works on a real shop floor.
Taper threads seal on the thread itself, which makes inspection different from parallel threads. A practical guide to NPT and BSPT gauging for shops that see these threads only now and then.
A gauge that gives different answers on the same part is worse than no gauge. A practical guide to running repeatability studies that tell you whether your measurement is trustworthy.
Internal and external threads need matched inspection strategy. Compare plug vs ring gauges, common mismatches, and how to specify a coherent gauge set.
Stop bad gauges at the gate. A practical incoming inspection checklist for identification, damage, certificates, and fit-for-use sign-off.
Ring gauges drift with cycles and handling. Learn practical wear limits, documentation habits, and when recalibration is no longer enough.