Table of Contents
Advertisement
48 BODY MANUAL
forced into their original position by the aligning and
roughing operation.
FIGURE 48
A true "oil can" dent can only occur in a low crowned
panel having elastic metal. The metal has been forced
inward (concave) to no greater extent than the metal
was curved outward (convex) in its original shape.
See Figure 48. No buckle is formed, and such a true
"oil can" dent is reshaped by the internal strains that
are in the metal just as soon as the pressure of the
blow or impact is released. The most to be expected
from an "oil can" dent is minor surface scratches.
There can be no buckles as the metal hasn't been
reformed.
ALIGNING AND ROUGHING
Aligning consists of reshaping a distorted body so that
it is "square" when checked from front to rear, hori-
zontally and vertically.
Roughing consists of reshaping damaged panels to
their approximate original contour as is shown in the
following two illustrations. Roughing operations are
frequently necessary where excess body damage pre-
vents proper body alignment.
FIGURE 49
A roughing operation on an "open" panel that does not
contain reinforced sections is illustrated in Figure 49.
A roughing operation to a damaged body panel that is
a combination of open panel and reinforced construc-
tion is shown in Figure 50.
FIGURE 50
The standard practice in beginning to reshape a damaged body
is to remove the dents and buckles in a reverse sequence to
which they occurred -- remove the last dent or buckle first,
Figure 51.
FIGURE 51
The last buckle to form will, when removed, relieve any strains
extending through buckles that were previously formed. One
combined aligning and roughing operation will correct each
buckle, and the manner in which the operation is performed will
vary according to the elasticity of the damaged metal.
FIGURE 52
Figure 52 shows a case where the metal was made non-elastic
in manufacture, and pressure at valley (A) must be constantly
maintained with a body jack while simultaneous pressure is
applied against both ridges and slopes of the buckle.
Advertisement
Table of Contents
