Shaft Critical Speed Calculator

Calculate the critical (whirling) speed of a rotating shaft.

n_cr = (30/π) × √(g/δ)

δ = 5mgL⁴ / (384EI)

I = πd⁴/64

Shaft Diameter (d), mm

Shaft Length (L), mm

Young's Modulus (E), GPa

Density (ρ), kg/m³

Additional Mass (m), kg

Critical Speed-

Static Deflection-