This outer boundary, called resultant condition, is calculated as: LMC + stated geo tol + any bonus, or: 6.2 + 0.3 + 0.4 = 6.9 mm. But sometimes I may be concerned about the outside boundary, created by the largest hole that is also off center: Now, virtual condition is usually easy to identify with - think of assembling pins and holes together. This virtual condition represents the “usable” area that the mating pin must fit within: ![]() The worst case for assembly purposes would be the smallest hole that is also out of position: 5.8 – 0.3 = 5.5. For instance, suppose we have the following example of a hole, with a size tolerance of 6 ± 0.2 mm: If you are familiar with GD&T, you’ve probably heard of “virtual condition.” It is a number that represents a worst-case combination of a feature’s size along with its geometric tolerance.
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