Tolerance Stack-up Analysis By James D. Meadows [extra Quality] Jun 2026

Tolerance stack-up analysis determines whether manufactured parts will assemble and function reliably when each dimension varies within its specified tolerance. Meadows frames the task as both a design and manufacturing problem: good tolerance design minimizes cost while ensuring performance and producibility.

Meadows is best known for challenging the status quo of the traditional and Root Sum Square (RSS) statistical methods. While these methods are taught in most engineering schools, Meadows argued that they are often misapplied, leading to either over-engineered products or unexpected assembly failures. tolerance stack-up analysis by james d. meadows

Meadows breaks down complex stack-up problems (1D and 2D) into a repeatable, logical process. He emphasizes the charting method , which forces you to account for every contributor to variation—not just dimensions, but geometric tolerances like flatness, perpendicularity, and position. While these methods are taught in most engineering