Heat Treatment, Furnaces & Thermal Processing calculator
Measured Part Distortion Calculator
Measure the dimensional change of one feature through heat treatment. Enter its before and after measurements at matching conditions and the permitted absolute change.
What this calculator does
- Compare a measured dimensional change after heat treatment with your entered absolute-change allowance.
Formula used
- Signed change = dimension after treatment − dimension before treatment
- Absolute change = absolute value of signed change
- Relative change = signed change ÷ dimension before treatment × 100
- Change margin = allowed absolute change − absolute change
Inputs explained
- Dimension Before Treatment: Recorded dimension at the defined measurement temperature before treatment.
- Dimension After Treatment: Same feature and measurement temperature after treatment.
- Allowed Absolute Change: Permitted change for this feature from the inspection plan.
How to use the result
- Best suited to before and after dimensional checks, heat-treatment distortion investigations.
- A single dimension cannot describe all warpage or shape error. Measurement uncertainty and final-size tolerances require separate evaluation.
Current U.S. benchmarks
- Industrial electricity averages 9.77 cents per kWh across the U.S. (EIA, Jul 2026), up 4.7% from a year earlier. Energy-intensive steps carry this directly into unit cost.
Common questions
- Does this predict distortion risk? No. It reports an observed dimensional change. Predicting future distortion needs validated process and material information.
- Why use matching measurement temperatures? Thermal expansion can change the measured dimension. Comparable conditions help isolate permanent dimensional change.
- Does passing the change allowance prove final size passes? No. The final dimension must also satisfy the drawing tolerance. A small change can leave an initially incorrect feature out of tolerance.
- Can one measurement detect all distortion? No. Inspect the required features, straightness, flatness or runout using the applicable measurement plan.
Last reviewed 2026-10-06.