Static Balancing:

In the previous unit, balancing of a disc was described. The centre of gravity of the disc was not coinciding the axis rotation but was at a distance 'r'. For balancing this disc either a mass 'M', is associated on the light side at a distance 'r₁' or mass is taken out through drilling from heavy side. By doing this the CG will coincide with the geometric centre or we may say at the axis of the shaft. This procedure is called static balancing. By doing this a state is attained when the overload on the bearings shall reduce to zero. But, the masse might still causes some net bending moment on the shaft that might cause shaft to vibrate. While a disc is balanced in the plane of unbalance, the bending moment vanishes that result in a situation while shaft will not vibrate. It is single plane balancing. Hence, in static balancing just one plane is needed for balancing. Just the force arising because of the eccentricity of mass that is centrifugal force is neutralised in the plane of its occurrence.