Describe how and why zero geometric tolerance is specified at MMC.
What will be an ideal response?
Zero geometric tolerance at MMC can be applied when the geometric tolerance in the feature control frame is zero and the MMC material condition symbol is used. This means that at the MMC produced size, the feature must be perfect in orientation with respect to the specified datum. As the actual produced size departs from MMC, the geometric tolerance increases equal to the amount of departure. This is done to create a boundary of perfect form at MMC to control the relationship between features.
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