Free Engineering Tool #234

Cardan Shaft Unbalance Calculator

Calculate permissible residual unbalance for driveshafts per ISO 21940. Enter mass, speed, length and balance grade.

ISO 21940DriveshaftsG16–G6.3

Results

Permissible Unbalance

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Per-Plane

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Eccentricity

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Same ISO 21940-11 formula as for general rotors. Driveshafts typically use G6.3 or G16.

G6.3 for passenger vehicles. G16 for agricultural/off-road. G2.5 for high-speed precision drives.

Balance in 2 planes with the universal joints installed. Use the complete assembly weight.

Unbalance, U-joint angle errors, phasing errors, and runout. Balance is only one factor.

Use the maximum operating speed for the unbalance calculation. Balance at a convenient speed.

Yes, using portable balancing equipment. Remove and balance on a machine for better accuracy.