The transmission screw has the characteristics of good transmission performance, high precision, and convenient processing and manufacturing, so it is widely used in ordinary horizontal lathes. The parts of the transmission screw are generally slender, and its length L and diameter d have a large aspect ratio, about 20 to 50, which belongs to the slender shaft. Its rigidity is relatively poor, and its structure and shape are relatively complex. The threads of the transmission screw are basically trapezoidal threads, and it has high quality requirements. In addition, the structure of the transmission screw is also of the type of steps, grooves, keyways, etc., so it is easy to bend, twist and deform, and "knife" in the process of processing.
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