TOLERANCE
geDimensioning and Tolerancing
all dimensions are in inches, unless otherwise stated
Most countries outside of the United States use the metric system of measure
The SI system is being used more in the United States because of global trade and multinational company affiliations
Maximum material condition (MMC)is the condition of a part when it contains the most amount of material.
Least material condition (LMC)is the condition of a part when it contains the least amount of material possible
Fit types
Clearance fitoccurs when two toleranced mating parts will always leave a space or clearance when assembled
Interference fitoccurs when two toleranced mating parts will always interfere when assembled
Transition fitoccurs when two toleranced mating parts will sometimes be an interference fit and sometimes be a clearance fit when assembled.
Geometric Controls
Form
Orientation
location
Straightness
Line element
•Axis
Circularity
Flatness
Cylindricity
Parallelism
Perpendicularity
Angularity
Line profile
Surface profile
Concentricity
coaxiality of diameters.
Runout
Position