The motion principle of CNC spinning and manual spinning in the product forming process is the same. The clamping force is provided by the tail top, which drives the material sheet to rotate together with the spindle. The cutting wheel extends the material sheet from point to line and from line to surface according to the predetermined cutting path, and finally forms. The difference lies in the path that the CNC spinning machine controls the cutting wheel during the spinning process, as well as the gap between the cutting wheel and the mold. Due to the high operating accuracy, good equipment rigidity, and large processing force of CNC machine tools, the manufactured products have good consistency, stable production, and can effectively control the accuracy of the products; In the process of manual spinning and forming, the cutting path of the cutting wheel is determined by manually controlling the cutting rod, and there are differences in the cutting path and gap between each product, resulting in unstable precision of batch products. When the thickness of the spun material exceeds a certain range (iron exceeds 1.2mm, aluminum exceeds 1.5mm, and stainless steel exceeds 1mm), manual force cannot support the required processing force during spinning, which can easily lead to product scrap. When manually spinning aluminum and iron products for thin parts, the outer wall surface of the processed product will be better than that of CNC spinning. But in recent years, with the continuous improvement of process technology, the outer wall surface of CNC spinning products has become very similar to manual spinning.