What: Calculating cumulative effect of individual tolerances on final assembly fit.

Methods:

1. Worst-case (simplest, most conservative)
2. RSS (Root Sum Square, more realistic)
3. Monte Carlo simulation (most accurate)

A good rule: design tolerance 30-50% tighter than required to account for stack-up.

Full guide: https://www.mfgabc.com/guides/tolerance-stackup-analysis.html

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