This form calculates Location and Orientation tolerances. The formulas are valid for all types of features, including flat mating surfaces, and will give a zero-interference/zero-clearance fit when features are at their maximum material condition (MMC) with their locations in the extreme of positional tolerance. [see ASME Y14.5-1994, paragraph B1] |
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Fixed Fastener Case: TOL1 = min[(ULSIZE1,LLSIZE1) - FNS]*(1-PD) TOL2 = min[(ULSIZE1,LLSIZE1) - FNS]*(PD) OR TOL2 = [[min(ULSIZE1,LLSIZE1) - FNS]/[1+(2*THK1/THK2)]]*(PD) The virtual condition of an internal feature is equal to the maximum material condition (MMC) minus its applicable tolerance of location. Since the virtual conditions are equal to the maximum material condition of the fastener, 100% interchangeability is ensured. |