thermal expansion check

Thermal Expansion Check for Machined-Part Inspection | Zhenling

Thermal Expansion Check

Use this calculator to estimate how temperature can shift a length reading before you compare it with a drawing. Enter the coefficient for the actual material and treat the output as an engineering-screening value, not an acceptance decision.

Measurement inputs

Measured length (mm)

Thermal expansion coefficient (µm/m/°C)

Measurement temperature (°C)

Reference temperature (°C)

Estimated change from reference

+3.45 µm

Estimated reference-condition length: 99.99655 mm

Reading the result

A positive value means the part is longer at the entered measurement temperature than at the reference temperature.
The calculation uses ΔL = L × coefficient × ΔT and assumes a uniform material temperature.
Coefficient uncertainty, temperature gradients, instrument uncertainty and fixturing still belong in the inspection plan.

Reference: NIST Engineering Metrology Toolbox. NIST uses a 100 mm steel example at 23 °C with an 11.5 µm/m/°C coefficient.

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Thermal Expansion Check

Measurement inputs

Reading the result

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