The machining process is relatively complicated, by one or several steps arranged in order of the composition, and the step can be divided into a plurality of installation, stations, and pass step, the blank is sequentially processed through these steps become for the finished product.
 (1) Step

　Step refers to one or a group of workers in a work place or while a few of the workpiece that consecutively portion of the process. The main basis for distinguishing process, is the workplace (or device) whether changes and complete that part of the content is a continuous process. A need for drilling holes and reaming, if a number of artifacts, each piece is drilled in the first turn on a machine, then reaming, drilling and reaming it constitutes a step.If the bulk of the workpiece are first drilled, then the whole batch of workpieces then reaming, drilling and reaming so it is divided into two steps up. Process is not only a basic process units, as well as the formulation of fixed working hours, with workers, schedule jobs and quality inspection basis. Usually list only the name of the main process simple process called routing.
　　(2) Installation and station
 Workpiece prior to machining, in the machine or fixture to occupy a correct position (location), then the process is called clamping fixture. The workpiece (or mounting unit) through a portion of the process that the content after the clamping is referred to as complete installation. In a process can have one or more of the installation. Workpiece clamping should minimize the number of times, because more and more a fixture on a fixture error, and increased support time.Therefore, commonly used in the production of various rotary table, rotary clamp or moving fixtures, etc., so that after clamping a workpiece can be processed to make it in different positions. To complete - a step of setting the content, after a fixture, the workpiece (or a mounting unit) and the jig or the movable portion of the device together with the relative fixed part of the tool or device for each occupied positions, called station.