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GD&T MMC Guide
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- Definition and Basics
- MMC indicates maximum material content within specified dimensional limits
- MMC symbol (M in circle) signifies maximum material condition
- MMC reduces manufacturing costs while maintaining part functionality
- Calculation Methods
- Internal features: VMC = MMC Size - Geometric Tolerance
- External features: VMC = MMC Size + Geometric Tolerance
- Virtual condition establishes theoretical boundary for proper assembly
- Bonus Tolerance
- Bonus tolerance allows additional tolerance when feature deviates from MMC
- Bonus tolerance equals difference between MMC and LMC sizes
- Bonus tolerance provides flexibility in manufacturing processes
- Applications
- MMC used for straightness tolerance with offset compensation
- MMC applies to position tolerance through surface or axis methods
- MMC used in zero tolerance requirements for reference holes
- MMC vs LMC
- MMC applies to external features at largest size
- LMC applies to internal features at largest possible size
- Both conditions allow tolerance adjustment based on actual part conditions