Tolerance Analysis
Design Processes
Working out whether parts will still fit and function when each is slightly off its nominal size.
In practice
Every manufactured part varies within a tolerance, and those variations stack: a hole a little small, a pin a little large, a housing a little short. Tolerance analysis predicts, statistically or worst-case, whether the assembled product still works across those combinations — and where to spend money on tighter tolerances and where to relax them.
Questions
What is Tolerance Analysis?
Tolerance analysis is the calculation of how dimensional variations across parts accumulate in an assembly, to ensure fit and function at production variability.
Why do you use Tolerance Analysis?
Because a design that only works at nominal dimensions fails on the line, and over-tightening every tolerance makes it unaffordable.
How do you use/apply Tolerance Analysis?
Identify the critical fits, chain the contributing dimensions, apply worst-case or statistical stacking, and adjust nominals and tolerances until the assembly works reliably.
When do you use Tolerance Analysis?
Before releasing drawings for any assembly with moving or mating parts.
Who uses Tolerance Analysis?
Mechanical engineers and industrial designers detailing for production.
