Tolerance Analysis

Tolerance Analysis is the logical capability of predicting how dimensional and geometric variation accumulates across an assembly — worst-case, RSS, or Monte Carlo — so that designers can size individual tolerances to meet final-assembly fit, function, and cost targets. It turns tolerancing from an art into an engineering discipline.

What it covers

• Worst-case stack-ups for safety-critical clearances.
• Statistical (RSS) stack-ups when capability data justifies relaxation.
• Monte Carlo simulation for non-linear and 3D contributors.
• GD&T-aware analysis that respects datum schemes and material modifiers.
• Cost-vs-tolerance tradeoff models for tolerance allocation.

Relationships (see sidebar)

• Supports the Detailed Design, CAE Analysis, and Quality Management processes.
• Implemented by systems like Siemens NX (Tolerance Analysis), Dassault CATIA (3DCS / VSA), and PTC Creo (EZtol / CETOL integration).
• Closely coupled with GD&T and downstream PMI Annotations.