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#402 / Interview Mechanical Engineering Easy

In the feature control frame shown, what do the “M” and “L” symbols signify?

Expand Hint
A feature control frame is a rectangle divided into compartments containing the geometric characteristic symbol followed by the tolerance value or description, modifiers, and any applicable datum reference features.
Hint 2
A datum is a plane, axis, point, or other reference geometry with respect to which the tolerance is specified.
A feature control frame is a rectangle divided into compartments containing the geometric characteristic symbol followed by the tolerance value or description, modifiers, and any applicable datum reference features. There is only one feature control frame in this example, which is associated with the 0.250 diameter hole. A datum is a plane, axis, point, or other reference geometry with respect to which the tolerance is specified. “A”, “B”, and “C” in the feature control frame are all datums, which are not displayed on the incomplete drawing.
The following symbol signifies Max Material Condition:
MMC, or Maximum Material Conditioning, is the version of a feature with the max amount of allowed material within a specified tolerance range. This typically translates to the smallest hole or largest pin.
The following symbol signifies Least Material Condition:
LMC, or Least Material Condition, is the version of a feature that contains the least amount of material (typically the largest hole or smallest pin) within the called out size limits.
Max Material Condition (MMC) and Least Material Condition (LMC)


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