The K Factor Calculator uses the thickness of the material, bend angle, inside radius, and bend allowance to find the K factor. .png)
INSTRUCTIONS: Choose units and enter the following:
- (`B`) Bend Angle
- (`IR`) Inside Radius
- (`BA`) Bend Allowance
- (`MT`) Material Thickness
K Factor (K): The calculator returns the answer as a decimal.
The Math / Science
When sheet metal is bent, the metal around the bend becomes deformed and stretched. When that metal deforms, a small amount of length is added to the original part. Deductions have to be made from desired part sizes for flat patterns to results in a correct flat size. The bend allowance is the material added to the actual leg lengths of the part in order to develop a flat pattern.
The K factor is directly related to how much material is stretched during the bend. If you have a bend allowance you can calculator the K factor from it. The K factor can be used to extrapolate bend allowances for new angles and radii.
To find the K factor, use the formula:
K = [(180 ⋅ BA) / (π ⋅ B ⋅ MT)] - (IR / MT)
where:
- K = K factor
- BA = bend allowance
- B = bend angle
- IR = inside radius
- MT = material thickness
Fabrication Calculators and Constants
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References
SheetMetal.Me (http://sheetmetal.me/formulas-and-functions/k-factor/)