24-01-2013, 03:07 PM
Dimensioning in engineering drawing
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Dimension/Dimensioning
Dimension:
The magnitude of something in a particular direction (especially length, width or height).
Dimensioning:
Indicating or determining size.
Dimensioning Rules
Avoid placing any dimensions on the part (inside the view) unless there is no other option.
Avoid dimensioning to hidden features
Always place the dimension where the characteristic shape is shown in the most descriptive view. (This means don’t place a dimension on object lines making a “T joint”.)
Always dimension holes in their circular view by stating the diameter of drilled holes. Specify the hole depth of special features such as countersinking with a note following the dimension.
Dimension rounded corners and arc features as radii where they appear in their rounded views.
If the same value is repeated many times, then use a general note for the features.