BendPak 1302BA-302, Operation And Service Manual

Page: 21 / 68

11. The measurement for the second bend should now
be taken. Since bent tubing is difficult to measure, it is
best to measure from the centerIine of the first bend, to the
centerIine of the second bend. This measurement should
then be added to the measurement taken for the first
bend. Record this information in the CENTER MARKS
section. (See figure 2-B)
12. Look at the rotation dial and take the reading for the
pipe rotation. Record this information in the second
PIPE ROTATION section.
13. You are now ready to make your second bend. With
the tubing or master laying flat on top of the back
shoes gradually extend the radius die forward until
the gates start to open and the tubing begins to
bend. Continue bending until the bend depth is equal
to that of the master. (See figure 2-C)
14. Take a reading for the bend depth and mark this in
the second BEND DEPTH section on the card.
NOTE:
Repeat these steps for the remaining bends.
After all bends are completed, make the necessary end
finishing and take a measurement for the overall cut off
length. Be sure to make all notations on the blank
program card for later reference.
USING A BLOCK OF WOOD
Some bending cards or certain bending applications require
the use of a BLOCK OF WOOD. This is used to “cushion”
the tubing when a half shoe is being used. The BLOCK OF
WOOD should be approximately 2” x 4” x 4” and will be used
together with the half shoe. When half shoes are used on
larger size tubing, they have the tendency to depress or
indent the tubing somewhat due to the reduced surface area
on the half shoe itself. The block of wood will crush as the
bend is being made and will help support the tubing and
minimize distortion. (See figure 3-A)
THREE INCH TUBE
BENDING PROCEDURE
High initial back gate pressure is required when bending
three inch tubing in order to get good, uniform bends.
Good bends will result when 13 gauge (.095 wall
thickness) is used. 14 gauge (.083 wall thickness) may be
used, but some tube deformation or inconsistency may
result.
These instructions MUST be followed closely for best
results. During this procedure use only the manual
operating controls. DO NOT USE AUTOMATIC
CONTROLS.
1. Upon installation of the three inch bending dies, it is
essential to readjust the sequence valve pressure.
This adjustment will require the use of a 1/4” Allen
wrench and a 3/4” open-end wrench.
2. Loosen the securing nut on the SEQUENCE VALVE
and insert the Allen wrench in the end of the
adjusting screw. The Allen wrench will remain in this
position during this bending process. (See figure 3-B)
Bender Operation Manual 21
Figure 2-C
Figure 2-B
Figure 2-A
Figure 3-A