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How to use it
Distribution from the centre of gravity. With the total mass, the axle spacing, the distance between running planes and the position of the centre of gravity you get the theoretical loads on the two axles, the two sides and the four wheels. Weighing tolerances. With the nominal axle load and the weighed wheel loads you get the deviations and the result against the tolerances; repeat for each axle.
Formulas used
Limits
The theoretical distribution treats the vehicle as rigid on identical suspension. For bogie vehicles the calculation gives the loads on the bogies, to be divided between the axles. The tolerances proposed are those in common use: the vehicle specification or the applicable standard may set others.
FAQ
Why is the wheel compared with half the axle?
The wheel tolerance measures the imbalance between right and left: the wheel load is compared with half the load weighed on the same axle, not with the nominal value.
What is done if the weighing is out of tolerance?
The suspension is adjusted, the supports are shimmed or masses and ballast are moved. Then the weighing is repeated for all wheels, because each correction also changes the others.