Bend Allowance and Bend Deduction - 2014

Bend Allowance and Bend Deduction - 2014

Bend allowance and bend deduction calculations are essential methods used to determine the flat length of sheet metal stock, ensuring the desired dimensions of the bent part. Other useful techniques include bend tables, K-Factor calculations, and bend calculation formulas.

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Understanding Bend Allowance and Bend Deduction Calculations

The following illustration shows important metrics, A and B, which are used in the calculation of bend allowance:

The equation to calculate the total flat length incorporating bend allowance is:

Lt = A + B + BA

where:

• Lt is the total flat length
• BA is the bend allowance value

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Additionally, another illustration shows metrics A, B, and BD, which are essential for calculating bend deduction:

To find the total flat length when considering bend deduction, use the equation:

Lt = A + B - BD

where:

• Lt is the total flat length
• BD is the bend deduction value

Note: The bend deduction (BD) should be measured from the virtual sharp.

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