The machining allowance refers to the thickness of the metal layer cut from the surface of the workpiece during machining. The machining allowance is divided into the total machining allowance and the process allowance. In the process of converting a blank into a part, the entire thickness of the metal layer removed on the machined surface is called the total machining allowance of the character (also known as the blank allowance); generally speaking, the total machining allowance is not a one-time Cutting, but gradually removed in each process, so the thickness of the metal layer removed in each process is called the machining allowance of the process (referred to as process allowance). The process allowance is the difference between the process dimensions of two adjacent methods, and the blank allowance is the difference between the blank size and the design size of the part drawing. Cutting depth refers to the thickness of your cutting, which is related to the efficiency of your processing. For example, if a machining allowance is divided into two cuts, the depth of the two cuts is the total machining allowance.