Archimedean Screw Auger & Helical Flighting Flat-Ring Annulus Unroller

Deterministic Helix arc-length L_in = √((π·d)² + P²), L_out = √((π·D)² + P²) -> developed flat annulus r_flat = (D-d)/2 / (L_out/L_in - 1) engine (.dxf, .pdf) built for Martin Sprocket, Hypertherm, ESAB, John Deere — zero-upload ephemeral Wasm RAM execution.

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