What are MMC and LMC?
A GD&T question about Maximum and Least Material Conditions.
Why Interviewers Ask This
These conditions define the limits of material amount in a feature. Interviewers test your ability to apply bonus tolerance concepts.
How to Answer This Question
Define MMC as the condition containing the most material (smallest hole, largest pin). Define LMC as the least material (largest hole, smallest pin). Explain how they relate to tolerance zones.
Key Points to Cover
- Most/Less material definition
- Feature size limits
- Bonus tolerance application
- Fit assurance
Sample Answer
Maximum Material Condition (MMC) is the state where a feature contains the maximum amount of material, such as the smallest diameter hole. Least Material Condition (LMC) is the opposite, containing the least material, like the largest hole. These conditions are used to apply bonus tolerances in geometric dimensioning.
Common Mistakes to Avoid
- Reversing MMC and LMC
- Not linking to tolerance
- Confusing with physical mass
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