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DIMENSIONS AND TOLERANCE - Coggle Diagram
DIMENSIONS AND TOLERANCE
To make products functional, it is important to:
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Types of dimensioning:
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Superimposed running dimensioning: Simplifies parallel dimensions in order to reduce space used on a drawing
Chain dimensioning: Should only be used if the function of the object will not be affected by the accumulation of the tolerances
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Dimensioning of radius: shows a radiusm dimensioned with the centre of the radius located on the drawing/dimension radii which do not need their centres locating
Dimensioning of circle, arc and hole: circle is dimensioned by diametere, an arc is dimensioned by its radius, holes are located by their centerlines
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Rules of dimensioning:
Dimensions should not be duplicated, i.e. same dimension should not be repeated on different views
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Dimension lines, extension lines and object outlines should not cross or overlap
Tolerances
Tolerances are included with dimensions in engineering drawings to take into account manufacturing limitations.
Types of tolerances:
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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