Blueprint Compositions, Continued
Finish marks show part surfaces that require finishing by machine.
Machining provides a better surface appearance and a better fit with closely
mated parts. Machine finishes are not the same as finishes of paint, enamel,
grease, chromium plating, and similar coatings. Finish marks appear on the
drawing near the surfaces to which they apply.
Additional information that does not belong in a regimented information
block is included on drawings as notes and specifications. Place notes giving
clarifying information directly on the drawing with a leader line that ties into
the affected part or assembly. Specifications are statements containing a
description such as the terms of a contract or details of an object not shown.
Specifications provide additional information to show that the item conforms
to the description and that it can be made without the need for further
research, development, or design engineering.
Legends and symbols explain and define special marks placed on the
drawing. Legends, if used, appear in the upper-right corner of drawings
under the revision block
Figure 1-43 is an example of a legend.
Figure 1-43.A legend.