Worst-case Tolerance Stackups

Worst-case Tolerance Stackups determine the absolute maximum variation possible for a

selected distance or gap. This distance is usually not dimensioned (it may have a

reference dimension) and is not directly toleranced. If it were directly toleranced, no

study would be necessary, as the limits would already be defined. When performing a

Tolerance Stackup, other dimensions and tolerances are added and subtracted to obtain

the total variation of the distance being considered. This method assumes that all

dimensions in the Tolerance Stackup may be at their worst-case maximum or minimum,

regardless of the improbability.