Three-Roller Tube & Pipe Arch-Bender Center-Screw Drop & Springback Calculator

Deterministic Three-circle external/internal tangent geometry h_drop = R_eff + r_top - √((R_eff + r_bot)² - (L_span/2)²) coupled with elastic-core springback R_eff engine (.pdf, .dxf) built for Baileigh, Ercolina, Harbor Freight, Blacksmith — zero-upload ephemeral Wasm RAM execution.

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