Question

In GD&T, which type of dimension should generally be directly tolerance with a plus/minus tolerance? If...

In GD&T, which type of dimension should generally be directly tolerance with a plus/minus tolerance? If a hole diameter is dimensioned 18 ± 0.2-in, determine the diameter of the hole at MMC and at LMC.

PLEASE EXPLAIN IN DETAIL WILL RATE

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Answer #1

Answer to 2nd part:

MMC = Maximum Material Condition

For a hole, for MMC, the hole diameter should be the least allowed. Hence for given dimension, the least allowed hole diameter = 18-0.2 = 17.8 in

Similarly, LMC = Least Material Condition

For a hole, for LMC, the hole diameter should be the maximum allowed. Hence for given dimension, the maximum allowed hole diameter

= 18+0.2 = 18.2 in

Answer to 1st part:

In GD & T, limit dimension is generally specified in terms of maximum and minimum values directly, i.e. direct tolerance with plus or minus values.

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