Based on the processability analysis of part drawings, machining procedures are reasonably formulated. On the condition that the rigidity of the part is not damaged, the machining of inner holes is arranged before the machining of outer circles. The machining stage can be divided into three stages: rough machining, semi - fine machining, and fine machining according to requirements. Confirm whether there is a stage where the main and secondary spindles are machined simultaneously. When making specific choices, corresponding machining methods and plans should be selected according to factors such as the accuracy and surface roughness requirements of the part, material, structural shape, and size.