Many of the rotors of large steam turbines use tree-shaped blade root grooves, which have complex shapes and high precision, and are usually used to measure the accuracy of line cutters with projectors. If the tool is qualified, it is considered that the processed wheel groove is also qualified. If an accident occurs, such as the circumferential index is not accurate, the tool wear exceeds the limit, the rough finishing center does not overlap, etc., the machined groove does not meet the drawing requirements, then the shape and geometry of the wheel groove are measured.
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