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Dimensions, Tolerances, Assemblies - Coggle Diagram
Dimensions, Tolerances, Assemblies
Dimensions in Drawings
Dimensions text
Base dimension: usually the units not included on every dimension text, but at the bottom of the drawing.
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Extension line
Continues or extend from the surface of the object and establishes the size of the dimension. They do not touch the object lines and extend the slightly past the dimension lines.
Extension line offset
A gap between the object surface and the extension line, so it is not confused with the visible lines of the model.
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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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Circle, Arc and Hole
A circle is dimensioned by its diameter, An arc is dimensioned by its radius, Holes are located by their centerlines.
Tolerance
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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Interference Fit
Difficult to move (or remove) the two interfacing parts. Usually, a lot of force is needed to remove the two parts.
Assembly Modelling
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Revolute Joint
Has a single rotational degree of freedom, much like a hinge.