Where $S_s$ is the allowable shear stress of the shaft material (e.g., Stainless Steel 316 typically $\approx 40-60$ MPa).
cap N sub c equals the fraction with numerator 60 center dot 4.987 and denominator the square root of delta end-root end-fraction : Total static deflection of the shaft in mm. Final Result Summary An effective agitator design tool calculates the required for mixing, the transmitted to the shaft, and ensures the Shaft Diameter ( is sufficient to prevent failure and avoid Critical Speed ( cap N sub c resonance. agitator design calculation xls