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Adjusting Setback
Setback is the required distance between the
breaker bar and the clamping leaf to properly
make the bend (see Figure 7). A number of fac-
tors determine the correct setback distance, such
as bend allowance, bend radius, and material
thickness.
Setback
Workpiece
Machine
Figure 7. Identification of setback.
There are many sources to help you calculate the
correct setback for your operation, such as metal-
working handbooks, the internet, or experienced
sheet metal workers.
Tools Needed
Calipers ............................................................. 1
Hex Wrench 5mm .............................................. 1
To adjust setback:
1.
Use calipers to measure distance between
both ends of clamping leaf and where
workpiece will contact breaker bar (see
Figures 8–9).
Clamping Leaf
Breaker Bar
Figure 8. Location of clamping leaf and breaker
bar.
-4-
Clamping
Leaf
2.
Qty
3.
Figure 9. Example of measuring setback.
— If distances measured in Step 1 are equal
and correct for operation, no adjustment is
required.
— If distances measured in Step 1 are not
equal or not correct for operation, proceed
to Step 2.
On side(s) of clamping leaf that need(s) set-
back adjustment, adjust set screw shown in
Figure 10.
Figure 10. Setback adjustment set screw
location.
— Tighten set screw to reduce setback.
— Loosen set screw to increase setback.
Repeat Steps 1–2 until setback is equal on
both sides of clamping leaf and correct for
operation.
Model T32714 (Mfd. Since 05/21)
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