Tolerance Stack-Ups & Geometric Tolerancing by the Numbers: Limits & Fits, Loop Diagrams, Worst Case vs Statistical, Position Tolerances, Bonus Tolerance & Allocation

What you'll build

What you will be able to do

Each lab ends with a concrete result that you build yourself and the checker confirms, cell by cell.

• Turn eight drawing callouts into maximum and minimum sizes, the tolerance of each feature and its mean size, so every later stack-up starts from clean limits.
• Pull hole and shaft deviations from a fictional fit table with XLOOKUP, work out the maximum and minimum clearance of six joints and let a formula classify each fit.
• Turn a gearbox shaft assembly into a loop of six dimensions with directions +1 and −1, add up the nominal gap with SUMPRODUCT, check it against a minimum and chart the chain.
• Add up the tolerances of the six-part chain, find the smallest and largest possible gap, compare them with the requirement and name the part to tighten first.
• Compute the root-sum-square tolerance of the same chain, inflate it with a fictional design-guide factor, find the statistical minimum gap and build a Pareto chart of each part's share.
• Turn measured hole centres into x and y offsets, compute each hole's positional deviation as a diameter, judge it against a round zone and compare that zone with an old ± square zone.
• Add bonus tolerance from the actual hole size, judge twelve fictional parts on size and position, and compare the virtual conditions of a hole and its mating pin.
• Price three tolerance plans from a fictional cost table, check each plan worst case and statistically, read the expected share of good assemblies from a fictional yield table and choose the cheapest plan that reaches the target.