TUBE BENDING (AVIM)
Tube ends shall be square to tube
centerline. OD of tube shall be free
of scratches 1-1/2 inches from tube
ends to ensure leak-proof swage at
If desired, tube may be cut oversize
and trimmed to desired length after
Cut tube (1) to required length (APP E-50, chart
A) (Task 7-5). If tube is cut oversize, mark both
ends of tube to finished length. Use marking
Mark tube (1) for the number of bends to be
made as follows (APP E-50, Chart B):
Identify one end of the tube as the X-end.
Mark distance from finished X-end to each
bend with a line (1.1) around the tube.
Mark a reference line (1.2) about 2 inches
long, along the length of the tube at the
X-end. Sight down the length of the tube
from the X-end with the reference line facing
up (12 oclock).
At each bendline (1.1) rotate the tube
clockwise the number of degrees shown in
the DIAL C SET column. Make a reference
line (1.3) about 2 inches long, along the
length of the tube at the bend line.
Use the line at the X-end as the zero
degree reference for tube rotation at
each bend line.