1. Avoid placing any dimensions on
the part (inside the view) unless
there is no other option.
2. Avoid dimensioning to hidden
features
3. 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”.)
4. 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.
5. Dimension rounded corners and
arc features as radii where they
appear in their rounded view.
6. Dimension cylindrical objects as
diameters in their rectangular
view.
7. Keep dimensions between the
views whenever possible
8. Extension lines may cross each
other and over other lines on the
part, but dimension lines should
never be crossed.
9. The overall dimension should
always be given. It should be
placed outside of smaller
dimensions and be the furtherest
dimension from the part.
10. Do not duplicate dimensions and
avoid using unnecessary or
superfluous dimensions
