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