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GE is the only turbine services provider to offer a unique coupling boring process called mirror bore. This patented process effectively takes coupling bolt hole boring out of critical path in outage, by allowing the individual coupling halves to be bored separately. When the coupling is later mated together, the bolt holes line up exactly, allowing easy installation of the coupling bolts. No final honing or other polishing is required as the machine leaves a 63 RMS finish on the whole surface when complete. A key benefit of coupling mirror bore is the reduced cost resulting form shorter turbine outages. In addition, the mirror bore process allows complete interchangeability of the rotors so that spares can be quickly and easily changed as needed. The coupling mirror bore process can be used for the following applications:
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Couplings
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