How do we decide the size of the machine?

The size of the machine should be optimum for the range of jobs you wish to handle. In case of mass produced components it is advisable to opt for tooled up machines with in built correction equipment. In case you wish to handle a range of components opt for the machine for the maximum range of components you wish to handle. A machine of 1-50 range is the best solution. That is a machine can handle 1kg to 50 Kg or 100 Kg to 5000 Kg or similar range. Such a machine will do jobs falling in the middle ranges in G 2.5 grade and 50 range at G1 grade and 1 range in G 6,3 or G 10 grade. A machine cannot balance the complete range of weights in the complete range of speeds to the best level of balancing quality grade.

Any other bigger range, say 1-100 is a compromise and may not be worth the time of men and machine. Similarly the power of the machine is decided by the inertia of rotors as in case of motor rotors, the power consumed while balancing as in the case of fans, or the speed with which you wish to stop and start the components. Remember in case you want to double the speed of balancing in a fan you need three times more power. You also need to check the physical size to be accommodated on the machine for driving safely for balancing.