Experiment 15Tolerance

Tolerance classificationDimension toleranceBilateralunilateral

Geometric toleranceFormProfileLocation

Natural spread of dimensions: The histogram

To fit shaft and hole together, there must have a standard to define the dimensions.Clearance fitInterference fitShrink fit Fitting part together

30H7/s8

The influence of tool wear

Control chartUpper and lower control limits

Selective assembly

Tolerance accumulation

Tolerance calculationWorst case analysis

Statistic tolerance

Surface qualityEquations:

Geometric tolerance

Weak points of size toleranceIncapable of controlling all aspects of the shape of the part.Do not use of datum.Extending the conventional tolerance method to control location.

Datums

Type of geometric tolerances

Location tolerance

Example As shown in figure, the diameter of bolt is 0.25-0.26in. Find the possibility of assembly.Sol.

Form tolerance