Grizzly G0479, Manual

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G0578 40" Pan and Box Brake 21
To bend metal objects accurately, you need to
consider the total length of each bend, especially
when more than one bend is required. This is
called bend allowance.
Subtract bend allowance from the sum of the
workpiece outside dimensions to obtain the over-
all length and width of the blank needed to make
a particular part.
Exact allowances can only be obtained by trial
due to differences in sheet metal hardness,
whether the bend is with or across the grain, and
difficulties in making an exact bend radius. Bend
allowances accurate enough for average use may
be found in metalworking handbooks.
Bending Allowance