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Shaft Critical Speed

Estimate first critical speed from known static deflection at a concentrated rotating mass.

Static deflection at mass: 1.5 mm
Live concept view — geometry scales with the entered design condition.

Design inputs

Enter known values using the units shown. Results and the live SVG view update immediately.

PRELIMINARY RESULT

Estimated first critical speed772 RPM

Calculation detail

Formula: Nc = 946 / √δ (δ in mm)

The first critical speed approximation uses the static deflection at the rotating mass location.