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TOOL IDB-MEC-009
Tolerance stack-up

Desktop only

Engineering tools are available only on desktop screens.

Tolerance stack-up

Linear stack-up with worst-case (arithmetic) and RSS (statistical) results. Positive nominals add, negative subtract.

Stack-up & envelope nominal —
parts TOTAL STACK — mm WC — — — RSS ±3σ Worst-case
Description
Nominal (mm)
±Tol (mm)
Engineering notes

Worst-case

  • Stack = Σ nominals; Tolerance = Σ |tol|.
  • Use when assembly must work even at extremes.

RSS (±3σ)

  • Tolerance = √(Σ tol²). Assumes independent normal distributions.
  • ~99.7% of assemblies fit within RSS.
  • Don't use for safety-critical interfaces.

Result

Live