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Practical engineering: files for production, flat patterns, checking 3D models against drawings — with calculations on real parts.

AI3D modelComparison

Drawing to 3D model: AI or engineer

Image-to-3D generator, AI that checks every dimension, or a freelance engineer: accuracy, turnaround and price by drawing type — PDF, scan, inches, sheet metal, castings, sketches, photos.

18 October 2026 · 6 min readRead →
r sheet thickness sinner radius r length along the neutral layer = flat pattern length neutral layer: r + K·s from the bend centre Outside the metal stretches, inside it compresses; along the neutral layer the length does not change.
CalculatorBendingK factor

Sheet metal flat pattern calculator

Blank length from thickness, radius, angle and flanges; K from a reference table, DIN 6935 or your own. Why K tables disagree and how to get your own K with a test bend.

18 October 2026 · 4 min readRead →
bend 1: 90° down, R4bend 2: 90° down, R4 DXF 1:1 mm · outline — CUT layer · bends — BEND layer · bend table — NOTES layer s = 2 mm · K = 0.45 (from r/s) · bend allowance BA = 7.697 mm
Laser cuttingSheet metalDXF

What file you need for laser cutting sheet metal

DXF at 1:1 in millimetres, closed contours, a flat pattern with bend allowance: what shops require from a file, a worked example and the mistakes that get files sent back.

17 October 2026 · 5 min readRead →
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