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Dimensions & Tolerance, types of dimensioning - Coggle Diagram
Dimensions & Tolerance
dimensions in drawings
dimensions can be defined with dimensions text with units, tolerance that dimensions is allowed to deviate, dimension line that has an arrowhead on each end, extension line, extension line offset
tolerance
Tolerances are included with dimensions in engineering drawings to take into account these manufacturing limitations
Bilateral Tolerance: allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
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In 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.
In clearance fit, there would still be an allowance for two parts to move, such as in a door hinge.
types of dimensioning
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circle - diameter, arc - radius, holes - centerlines
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