Variable Bore Gauging
When a fixed-limit gauge would surrender too much of the band, measure the actual size instead.
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Coming from a tight tolerance on the classes page? Variable methods read a real dimension rather than pass/fail, so they don’t consume tolerance the way a fixed gauge does.
| Maker | Method | Range | Notes |
|---|---|---|---|
| Dyer | Indicating bore gauges (many series) | small bores to ~118″ (3000 mm) | indicator-based |
| DIATEST | Split-ball bore probes | 0.47–30.60 mm; to Ø150.6 mm (3-point) | ~1 µm |
| Air / CMM | — placeholder — | — | future |