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Bending Allowance
When a bend is made in sheet metal, the inside
surface of the bend compresses and the outside
surface stretches. To bend metal objects accu-
rately, you need to consider the length of each
bend, especially when more than one bend is
required. This is called bend allowance.
As a rule of thumb, subtract the bend allowance
from the sum of the workpiece outside dimen-
sions to obtain the overall length and width of the
blank needed to make a particular part.
Exact allowances can only be obtained by trial
and error due to differences in sheet metal hard-
ness, whether the bend is with or across the
grain, and the bend radius. Use metalworking
handbooks or the internet to find bend allowances
accurate enough for average use.
Positioning
Counterweight
The counterweight helps to provide additional
leverage when bending thick workpieces, and can
be adjusted to vary the weight being applied by
the bending leaf.
The gauge of the workpiece determines where
the counterweight should be placed. For example,
the counterweight would be positioned low in the
collar for bending 20-gauge steel, and high for
bending 12-gauge steel.
Items Needed:
Additional Person .............................................. 1
Hex Wrench 8mm .............................................. 1
-18-
To position counterweight:
1.
Loosen (2) cap screws on bending leaf coun-
terweight collar (see Figure 17).
Counterweight
Cap Screw
(1 of 2)
Figure 17. Location of bending leaf
2.
Have an additional person insert counter-
weight into counterweight collar, then tighten
(2) cap screws to secure.
— For maximum weight leverage, posi-
tion narrow end of counterweight flush
with bottom of counterweight collar (see
Figure 17).
— For less weight leverage, extend narrow
end of counterweight beyond bottom of
Qty
counterweight collar until desired weight is
achieved.
Lifting heavy machinery or
parts without proper assis-
tance or equipment may
result in strains, back inju-
ries, crushing injuries, or
property damage.
Counterweight
counterweight components.
Model G0950 (Mfd. Since 08/21)
Collar
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