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Bend Allowance and Bend Deduction

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.

Bend Allowance Calculations

The following equation is used to determine the total flat length when bend allowance values are used:

Lt = A + B + BA

where:

  • Lt is the total flat length

  • A and B are shown in the illustration

  • BA is the bend allowance value

 

Bend Deduction Calculations

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

Lt = A + B - BD

where:

  • Lt is the total flat length

  • A and B are shown in the illustration

  • BD is the bend deduction value

 



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