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Dimensions, Tolerances and Assemblies - Coggle Diagram
Dimensions, Tolerances and Assemblies
Dimensions
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chain dimensioning
Should only be used if the function of the object would not be affected by the accumulation of the tolerances.
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parallel dimensioning
Consists of several dimensions originating from a common reference surface (also known as the datum).
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Tolerances
In practice, parts cannot be manufactured exactly to the dimensions stated in the drawing, due to manufacturing variations. Tolerances are included with dimensions in engineering drawings to take into account these manufacturing limitations.
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Bilateral Tolerance
allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount. Allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
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Assemblies
clearance fit
there would still be an allowance for two parts to move, such as in a door hinge.
interference fit
it would be difficult to move (or remove) the two interfacing parts. Usually, a lot of force is needed to remove the two parts. Examples are shafts that are fitted through bearings, so that the shaft does not slip