Practical guidance on gauging, calibration, standards, and shop-floor quality, from the DSN engineering team.
A worked error budget for thermal effects on gauge readings in Indian workshops without climate control. Differential expansion between steel gauges and aluminium/brass/titanium workpieces, soak
When the spacing between two rollers decides the product, a vernier leaves too much to the operator. A stepped gap gauge turns it into a fit you can feel.
A shop-floor guide to building a wrung gauge block stack you can trust: grade selection per ISO 3650, wringing film thickness variability, thermal soak times by material, stack-building rules, and
A profile gauge is a flat template cut to the shape a part must have. Held against the part, any gap shows at once. It will not replace a CMM, but at the machine it answers the question faster.
The bore measures 25.012 mm inside a 25H7 band and the GO plug still will not enter. Five causes, in the order they are worth checking.
An order for an 'M20 thread gauge' is missing three of the four things needed to make one. Each element of a metric callout, and what an omission does.
M12 and M12x1.25 share a diameter and little else. Knowing which pitch a drawing means decides which tap, which gauge and which pitch diameter you hold.
An order that says '25 mm plug gauge' leaves six decisions to whoever makes it. Here is the full specification, and what each omission tends to cost.
A wheel that will not seat, a flange that fights the studs: both usually trace back to the pitch circle diameter. Here is how a PCD gauge checks it faster than a vernier, and what to send when you need one made.