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The spline broach is composed of cutting teeth and calibration teeth, and the pitch is determined according to the length of the workpiece broaching. The smaller the pitch, the more the number of teeth working at the same time, the smoother the cutting process and the lower the surface roughness of the machined surface. However, the pitch is small and the volume of the chip pocket is small. It is easy to block the swarf in the groove and break the broach. The tooth pitch is too large, which not only reduces the number of teeth that work at the same time, but also increases the length of the broach. To protect
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