The Bend Allowance Calculator uses the thickness of the material, bend angle, inside radius, and K factor to find the bend allowance. .png)
INSTRUCTIONS: Choose units and enter the following:
- (B) Bend Angle
- (IR) Inside Radius
- (K) K Factor
- (MT) Material Thickness
Bend Allowance (BA): The calculator returns the answer in inches (in). However this can be automatically converted to compatible units via the pull-down menu.
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.
To find the bend allowance, use the formula:
BA = π/180 ⋅ B ⋅ (IR + K) ⋅ MT
where:
- BA = bend allowance
- B = bend angle
- IR = inside radius
- K = K factor
- MT = material thickness
Fabrication Calculators and Constants
- K Factor Calculator
- Aluminum Wire Deposition Rate Calculator
- Steel Wire Deposition Rate Calculator
- Welding Heat Input Calculator
- Groove Weld Potential Root Cracking Calculator
- Weight of Hot Rolled Steel Flats
- Modulus of Elasticity for Martensitic Stainless Steel
- Brinell Hardness of Gray Cast Iron
- Bend Allowance
Welding Calculators:
- Bend Allowance Calculator: Computes Bend Allowance based on the thickness of the material, bend angle, inside radius, and K factor.
- Weight of Aluminum Square Bars: Computes the average weight of aluminum bars based on the number and dimensions of the bar, and an average density of 2700 kg/m3 for aluminum bars.
- Aluminum Wire Deposition Rate Calculator: Estimates the rate at which a welding wire is converted into weld metal using the electrode diameter, wire feed speed, and electrode efficiency.
- Welding Heat Input Calculator: Estimates the amount of heat or thermal energy that is introduced to a material when a weld is made using the arc voltage, current, and travel speed.
- Groove Weld Potential Root Cracking Calculator: Determines whether or not the groove weld has a potential for root cracking based on the width-to-depth ratio (1.0-1.4).
- Weight of Hot Rolled Steel Flats: Computes the average weight of steel flats based on the number and dimensions of the flats, and an average density of 7800 kg/m3 for steel flats.
- Modulus of Elasticity for Martensitic Stainless Steel: The measure of stainless steel's tendency to deform elastically when a force is applied.
- Brinell Hardness of Gray Cast Iron: Measure of gray cast iron's ability to resist permanent indentation deformation.
- Weight of Brass Rounds: Computes the weight of any number of brass round bars based on the number of rods, their dimensions, and an average density of 8,600 kg/m3 for brass.
References
SheetMetal.Me (http://sheetmetal.me/formulas-and-functions/bend-allowance/)