Micrometer calibration in Perth

A micrometer is the instrument a machinist reaches for when the tolerance is tight, so its calibration record is the one an auditor is most likely to ask about. AmpTech calibrates external, internal and depth micrometers in our Caversham lab against traceable gauge blocks, checking readings at points across the full range.

Types of micrometers we calibrate

• External micrometers (0–25 mm upward, in 25 mm steps)
• Digital micrometers
• Depth micrometers
• Blade, point and specialised anvil micrometers

What the calibration covers

• Reading against gauge blocks at points across the range, chosen to exercise the full rotation of the thimble
• Zero setting, and the setting standard supplied with larger micrometers
• Anvil and spindle face condition and contact
• Ratchet or friction thimble operation, which affects repeatability
• Rod extensions on depth micrometers, each checked individually

Parameters measured

Why micrometers drift

Micrometers are robust but not immune: worn or damaged measuring faces, a bent frame from a drop, and a spindle thread that has picked up grit all introduce errors. Because a micrometer resolves to a hundredth of a millimetre or better, errors that a caliper would never reveal are exactly what matter here.

What your certificate records

• As-found and as-left readings at each gauge-block length checked
• Zero and setting-standard results
• Measuring-face condition observations
• Gauge blocks and reference standards used, with traceability

References we work to

• Manufacturer's published accuracy specification for the model and range
• ISO 9001 clause 7.1.5 — monitoring and measuring resources