Blank Development Calculator

Develop the correct flat blank dimensions for a formed part by accounting for bend allowances along the neutral axis.

The flat blank for a formed part is the sum of the flat flange lengths plus the material consumed by every bend (the bend allowances along the neutral axis).

Get the bend allowances right — via K-factor or tested values — and the blank cuts to size the first time.

Formula: Blank length = Σ flat flange lengths + Σ bend allowances

Worked Example

  1. Two 1.000 in flanges joined by a 90° bend with BA = 0.238 in.
  2. Blank length = 1.000 + 1.000 + 0.238 = 2.238 in.

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