standardized by the military. A Bill of Material block for
an electrical plan is shown in figure 3-3.
The Application block (fig. 3-4) is usually located
near the Title block and identifies directly or by
reference the larger units of which the detail part of
assembly on the drawing forms a component. The Next
Assembly column shows the drawing number or model
Figure 3-4.-Application block.
number of the next larger assembly to which the drawing
applies. The Used On column shows the model number
of paint, enamel, grease, chromium plating, and similar
or equivalent designation of the assembled units of
which the part is a component.
Notes and Specifications
Blueprints contain all the information about an
are used on machine drawings to
object or part that can be presented graphically-that is,
indicate surfaces that must be finished by machining.
in a drawing. A considerable amount of information can
Machining provides a better surface appearance and
be presented this way, but supervisors, contractors,
provides the fit with closely mated parts. In
manufacturers, and craftsmen require more information
manufacturing, during the finishing process, the
that is not adaptable to the graphic form of presentation.
required limits and tolerances must be observed.
Information of this type is given on the drawings as
Machined finishes should not be confused with finishes
Figure 3-3.-Bill of Material block.