MMC vs LMC

#092 / Interview Mechanical Engineering Easy

In terms of General Dimensioning and Tolerancing (GD&T), explain the differences between MMC and LMC.


Expand Hint
MMC = Max Material Conditioning
Hint 2
LMC = Least Material Conditioning
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 (think weighs the least). MMC, or Maximum Material Conditioning, is the version of a feature with the max amount of allowed material within a specified tolerance range (think weighs the most). This typically translates to the smallest hole or largest pin. MMC defines the worst case scenario of a part dimension that will still assemble at the next higher level because the hardware is within the defined tolerance zone.
LMC, or Least Material Condition, is the version of a feature that contains the least amount of material within the called out size limits. MMC, or Maximum Material Conditioning, is the version of a feature with the max amount of allowed material within a specified tolerance range.


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