One-bend K-factor arithmetic
Sheet-metal bend development
Inputs
Included bend angle in degrees for the one stated bend.
Nominal inside bend radius.
Nominal sheet thickness.
User-entered neutral-axis ratio; this screen does not select it.
First stated outside-to-apex flange length for the one-bend model.
Second stated outside-to-apex flange length for the one-bend model.
Results
Bend allowance
4.1312
Outside setback
3.5
Bend deduction
2.8688
One-bend flat-length estimate
87.131
BA = (π/180)B(IR + K·MT); OSSB = tan(B/2)(IR + MT); BD = 2OSSB − BA; Flat = L₁ + L₂ − BD
A first-pass number, not a code check, certification, or approval. Read the method and its limits below. What this is and is not.
Nearby: Milling removal rate · Drilling speed & time · Turning material removal · Milling cutting parameters
Method
Formula, when it applies, and when it does not
Calculate bend allowance, bend deduction, outside setback, and a one-bend flat-length estimate from sheet-metal geometry.
BA = (π/180)B(IR + K·MT); OSSB = tan(B/2)(IR + MT); BD = 2OSSB − BA; Flat = L₁ + L₂ − BD
When
- One bend
- User-entered K-factor
- Nominal geometry
- Flat length from stated flanges
Don’t
- This is nominal one-bend K-factor arithmetic with user-entered inputs. It excludes K-factor selection, bend-radius rules, springback, tooling, grain direction, forming method, material condition, tolerances, bend relief, multi-bend sequencing, collision, and manufacturing qualification.