Post on 18-Dec-2015
description
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