Patent ID: 7069654

Claim:
A method of balancing a rotor, comprising: determining the position of the centre of mass of a rotor to be balanced prior to the rotor being machined to its final dimensions, the rotor comprising at least one of a compressor rotor stage or a turbine rotor stage for a gas turbine engine, and including a radially inner periphery and a radially outer periphery; and machining the rotor to its final dimensions by removing material from at least one of the radially inner periphery of the rotor or the radially outer periphery of the rotor, substantially along the length of the rotor in an axial direction, thereby substantially adjusting the centre of mass of the rotor to be co-incident with the axis of rotation of the rotor, wherein, in machining the rotor to its final dimensions, material may be removed from any discrete point, any series of discrete points, or continuously along an entire axial length of the rotor rather than from a discrete axial section where material has been added in the manufacturing process as a balance land to be later removed.