Bend Allowance and Bend Deduction - 2014

Bend allowance and bend deduction calculations are methods you can choose to determine the flat length of sheet stock to give the desired dimension of the bent part. Other methods include bend tables, K-Factor, and bend calculation.

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Bend Allowance and Bend Deduction Calculations

The following illustration shows A and B, used to calculate the bend allowance:

The following equation is used to calculate the total flat length for bend allowance:

Lt = A + B + BA

where:

• Lt is the total flat length

• BA is the bend allowance value

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The following illustration shows A, B, and BD, used to calculate the bend deduction:

The following equation is used to determine the total flat length for bend deduction values:

Lt = A + B - BD

where:

• Lt is the total flat length

• BD is the bend deduction value

  You must measure the bend deduction (BD) from the virtual sharp.

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