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Dimensions, Tolerance, Assemblies - Coggle Diagram
Dimensions, Tolerance, Assemblies
Dimensions
- Parallel dimensioning (Datum dimensioning)
Consists of several dimensions originating from a common reference surface (also known as the datum)
- Superimposed running dimensioning
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Should only be used if the function of the object would not be affected by the accumulation of the tolerance
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- Dimensioning small features
Placing arrow heads between the extension lines may make the dimensions very hard to read. Arrow heads can be placed outside the extension line instead
- Dimensioning of other features
To dimension different dimensions, use N x dimension
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- Dimensioning circle, arc, hole
A circle is dimensioned by its diameter. An arc is dimensioned by its radius. Holes are located by their centerlines
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types of tolerance
- Bilateral Tolerance: allowed to vary in two directions from the specified dimension. Both directions need not vary by the same amount.
- Unilateral Tolerance: allowed to vary in only one direction
- Limit Tolerance: the upper and lower limits of the dimension are specified
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Assemblies
joints
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- Revolute Joint: Has a single rotational degree of freedom, much like a hinge.