Abstract: A rotor assembly comprised of a multiplicity of blades mounted around the periphery of a disk has the blade tips ground to great diametrical precision when the assembly is rotated at a high speed in excess of 1000 rpm in a special grinding process. Individual blade lengths are dynamically measured while the assembly is being ground. These measurements are used to control the grinding process and to also permit accurate assessment of the quality of assemblies in general. A laser triangulation measurement system is used. It is capable of very fast reading of blade length since 3300 or more blades may pass by the measuring point each second.

Abstract: A rotor telemetry apparatus 60 for providing a data communication link between a rotating member 68 and a stationary member 66 of a rotary machine is disclosed. The rotor telemetry apparatus includes a pair of coils 72 each mounted on an associated member for transferring electrical energy between the stationary member 66 and rotating member 68 of the turbomachine. At least one coil of the pair of coils is held by a first layer 88 of bonding agent and is attached to one of the members by a second layer 90 of bonding agent which is filled with a magnetizable material having a magnetic permeability under operating conditions that is greater than the magnetic permeability of the bonding agent. A method of assembling the coils to the stationary and rotating members is also disclosed.