Page 280 - The Jet Engine

Overhaul

Fig. 25-6 Dynamic balancing machine.

49. Removing weight by machining metal from 50. Modular assembled engines demand different
balancing lands is the third basic method, but balancing methods which include the use of
normally it is only employed on initial manufacture simulated engine rotors. The dummy rotors must
when balancing a component, e.g. a turbine shaft or reproduce the bearing span, weight, centre of gravity
a compressor shaft, that is part of a larger assembly. and dynamic characteristics of the sub-assembly it

Fig. 25-7 Simulated engine rotor assemblies.

270