Lt is the total flat length
A and B are shown in the illustration
BA is the bend allowance value
You can choose either bend allowance or bend deduction calculations to determine the flat length of sheet stock to give the desired dimension of the bent part.
The following equation is used to determine the total flat length when bend allowance values are used:
Lt = A + B + BA
where:
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The following equation is used to determine the total flat length when bend deduction values are used:
Lt = A + B - BD
where:
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