Group dimensions
Do not use object lines as extension lines.
Stagger dimension text
Stagger the dimension text on parallel dimensions.
Extension lines should not cross dimension lines, are not broken when crossing object or other extension lines, are broken when crossing arrows.
Extension lines can cross to mark a theoretical point.
Dimension outside of view
Using X to dimension repititive features
Radial leader lines
Symbols for drilling operations
Arcs of less than half a circle are dimension as radii, with the R symbol.
Avoid Overdimensioning
Double dimensioning can cause problems because of tolerancing.
Dimensioning the most descriptive view
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