(1980), approved and adopted for use under
DoD-STD-100C. Flat size refers to drawings that,
because of their relatively small size, should be
stored or filed flat. Roll size refers to drawings
that, because of their lengths, are filed in
rolls. Finished format sizes for a drawing refer
to the dimensions between trim lines (X and Y
in figure 3-14, view A). The TRIM LINE is the
outside line of either the vertical or horizontal
margin. The inside lines of the margins are
called BORDERLINES. Width (X) is always
PARALLEL to the working edge of the drawing
board; length (Y) is always PERPENDICULAR
to the working edge of the drawing board.
Notice, in figure 3-14, view B, that 2 in. should
be added to the left margin and to the right margin
for protection of roll-size drawings. The edge of
a drawing prepared on tracing paper will tear
easily after it is rolled and unrolled several times.
SHEET LAYOUT
Sheets of drafting or tracing paper are
cut slightly larger than their required finished
sizes and are fastened to the drafting board as
previously described. Using a hard (4H to 6H)
pencil and a T square (or parallel straightedge),
draw a horizontal trim line near the lower edge
of the paper. Then draw a vertical trim line near
the left edge of the paper with a T square (or
parallel straightedge), pencil, and triangle, as
previously described. Dimensions establishing the
finished length of the sheet (distance between
vertical trim lines) and the location of the vertical
borderlines are marked off on the horizontal trim
lines. A full-size scale should be used when you
are laying off a series of measurements along a
line. Dimensions establishing the finished width
of the sheet (distance between horizontal trim
Figure 3-15.-Preparing title block for A-, B-, C-, and G-size drawings.
3-12
