In whirlwind milling screw processing, the thread and knurling can be completed at one time. The product has high process efficiency, low cost, and low machining accuracy requirements, and its structural design ideas and schemes have good promotion and application value. The whirlwind milling method is a high-efficiency thread processing method, which is suitable for the rough processing of large batches of threads. The process is to use a carbide cutter to mill the threads at a high speed. It has the advantages of good tool cooling and high production efficiency. For threads that do not require high precision, this method can be used to complete the cutting process at one time. The rotation axis of the whirlwind milling cutter is in a spatial position relationship with the axis of the workpiece, and the intersection angle is the β angle (equal to the helix angle). The machining process includes the rotational movement of the workpiece, the helical axial feed movement of the workpiece (or tool feed), and the rotational movement of the cutting edge on the milling cutter disk.
　　For the trapezoidal screw, the rolling process is better than the cutting (milling by lathe) process. Because the surface of the rolled screw is stronger and the surface finish is better, in addition, the rolling process can be used to process long bars, which can then be cut into any length. The precision of the rolling screw can be better than 0.003 inches per foot. For higher precision, you should consider using a grinding process. The ground screw can achieve an accuracy of 0.0003 inches per foot or better. However, the cost of the grinding process is much higher (10 times).