9.1 Tolerance Stackup

Dimensional variation analysis

Standards catalog

Validation: indicative · Method band: formula

Indicative method: Indicative closed-form or numerical model

Linear elastic material behavior unless noted otherwise.
User is responsible for load combinations and load factors per the selected design code.

Does not replace a licensed professional engineer or official code compliance review.

Check	IND	US	EU	ISO
Worst-case stack	implemented	—	—	—
RSS stack	implemented	—	—	—

Purpose: 1D dimensional stack — worst-case and RSS.

Method: Closed-form

\text{WC} = \sum t_i, \quad \text{RSS} = \sqrt{\sum t_i^2} $$[^iso-286-asme-y14-5-referenced] **Design codes:** ISO 286, ASME Y14.5 referenced. **UI:** Legacy layout; unit profile. **Gaps:** Linear stacks only; no GD&T datums or Monte Carlo. --- [^iso-286-asme-y14-5-referenced]: ISO 286, ASME Y14.5 referenced.

Maintainer note: Stack-up arithmetic; low migration complexity.