The Datum

The issue A three-point bore gauge measures relative to zero, and that zero has to be set before every job against a known diameter. The standard method is a ring gauge machined to the exact nominal size being measured. The problems with the usual answers Buying a full set

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The issue Depth is a key challenge for accurate bore gauging. Honed hydraulic cylinders, gun barrels, drive housings, heat-exchanger bores — the diameter that matters is metres from the operator's hand, and three separate problems compound on the way down: the gauge axis must stay aligned to the