CNC Ballscrew Critical Whipping RPM, Buckling Load & Preload Life Sizer

Deterministic Rayleigh-Ritz lateral eigenfrequency n_crit = f_end * d_r / L^2 * 10^7 + Euler column buckling & ISO 3408-5 L10h fatigue engine (.pdf, .csv, .json) built for THK, HIWIN, NSK, Bosch Rexroth — zero-upload ephemeral Wasm RAM execution.

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