Generator-Shaft

Generator shafts connect the turbine to the generator rotor. They need a through-hole for the rotor assembly tie bolts and for cooling air circulation. The shaft is typically 4-8 meters long with a 100-300mm bore depending on the generator size. In my experience, the bore quality directly impacts rotor balance and cooling efficiency, both of which affect generator reliability over decades of service. Material Selection and Forging Considerations The material is usually a high-strength steel forging like 25CrMo4 or 34CrNiMo6. The shaft weight can be 10-30 tons. The bore concentricity requirement is typically within 0.5mm of the shaft centerline. ...

Power generation equipment covers a broad range of machinery: steam turbines, gas turbines, generators, and hydroelectric components. Almost every large rotating assembly in a power plant needs a through-bore for inspection access, balancing, or cooling flow. I have drilled components for coal plants, nuclear plants, gas turbines, and hydroelectric stations. Each application has its own set of requirements, but they all share one thing: the parts are large, expensive, and cannot be replaced easily. The process is similar to steam turbine rotor drilling but scaled up significantly. ...