mum where the boss and hole are at their LMC sizes and both features are displaced in opposite extremes. Since positional tolerances are specified on an LMC basis, as each feature departs from LMC, the wall thickness increases. This permits a corresponding increase in the positional tolerance, thus maintaining the desired minimum material thickness between these surfaces.
18.104.22.168 LMC Applied to a Radial Pattern of Slots. In Fig. 5-14, a radial pattern of slots is located relative to an end face and a center hole. LMC is specified to maintain the desired relationship between the side surfaces of the slots and the true position, where rotational alignment with the mating part may be critical.
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