TOLERANCING - Inch Tolerances

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Inch Tolerances

 

Lecture content

Definitions

 

Shaft-Hole assembly

 

Limits: The limits are the maximum and minimum size that the part is allowed to be.

 

Basic Size: The basic size is the size from which the limits are calculated. It is common for both the hole and the shaft and is usually the closest fraction.

 

Tolerance: The tolerance is the total amount a specific dimension is permitted to vary.

 

Maximum Material Condition (MMC): The MMC is the size of the part when it consists of the most material.

 

Least Material Condition (LMC): The LMC is the size of the part when it consists of the least material.

 

Maximum Clearance: The maximum amount of space that can exist between the hole and the shaft.

 

Max. Clearance = LMChole – LMCshaft

 

Minimum Clearance (Allowance): The minimum amount of space that can exist between the hole and the shaft.

 

Min. Clearance = MMChole – MMCshaft

 

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