Press Brake & Bending
Bend Allowance Calculator
Calculate bend allowance for accurate flat pattern development. Essential for creating precise sheet metal blanks before bending.
- Bend Angle: The angle of the bend in degrees.
- Inside Radius: The radius on the inside of the bend.
- K-Factor: Material-dependent factor (0.33-0.5).
- Bend Allowance: Arc length of the neutral axis.
Bend Allowance Calculator
Units:
°
mm
mm
Theory & Formulas
Bend Allowance Formula:
BA = A × (R + K × T)
Where:
- BA = Bend Allowance
- A = Bend angle in radians
- R = Inside bend radius
- K = K-factor (typically 0.33-0.5)
- T = Material thickness
K-Factor Guidelines:
- Soft materials (Al): 0.33
- Semi-hard (mild steel): 0.44
- Hard materials (stainless): 0.5
BA = A × (R + K × T)
Where:
- BA = Bend Allowance
- A = Bend angle in radians
- R = Inside bend radius
- K = K-factor (typically 0.33-0.5)
- T = Material thickness
K-Factor Guidelines:
- Soft materials (Al): 0.33
- Semi-hard (mild steel): 0.44
- Hard materials (stainless): 0.5