Line Conventions, Continued
Phantom or
datum lines
To indicate alternate positions of parts, repeated detail, or to indicate a datum
plane, use phantom or datum lines. Phantom or datum lines consist of a
medium weight series of one long dash and two short dashes evenly spaced
and terminating in a long dash.
Figure 3-19 is an example of a phantom line.
Figure 3-19.—Showing
alternate lever positions with
phantom lines.
Stitch lines
Depict stitching or sewing on an object with medium-weight, short dashes
evenly spaced and labeled as stitching or sewing. These lines are called
stitch lines.
Figure 3-20 is an example of stitch lines.
Figure 3-20.—Stitch lines showing
the reenforcement of a d-ring on a
strap.
Continued on next page
3-22
