① General fixture. Such as machine vice, chuck, sucker, dividing head and rotary table, there is a great versatility, can better adapt to the processing process and processing object transformation, its structure has been set, size, specifications have been listed, most of them have become a standard machine tool accessories.

　　② Special fixture. It is specially designed and manufactured for the clamping needs of a certain product part in a certain process. The service object is specific and targeted, which is generally designed by the product manufacturer. Commonly used are lathe jigs, milling machine jigs, drill dies (jigs used to guide the tool to drill or ream holes on the workpiece), boring dies (jigs used to guide the boring rod to boring holes on the workpiece), and accompanying jigs (mobile jigs used on the automatic line of modular machine tools).

　　③ Adjustable fixture. Special clamps in which components can be replaced or adjusted.

　　(4) Combination of fixtures. The fixture consists of standardized components of different shapes, specifications and uses. It is suitable for new product trial production and frequent replacement of products in single pieces, small batch production and temporary tasks.

　　The composition of fixtures: Any complete set of fixtures are generally composed of the following parts:

　　(1) positioning element. It is a fixture element that is in contact with the workpiece positioning datum so that the workpiece has the correct position relative to the machine tool.

　　(2) clamping mechanism. It is used to tighten the workpiece mechanism, to ensure that in the process of processing not due to external force and vibration and destroy the correct position of the workpiece positioning.

　　(3) tool element and guide element. The tool element is used to ensure the accurate position of the fixture, such as the tool block of the milling machine fixture, etc. Guide elements can guide and keep the position and direction correct, such as drill sleeve, boring sleeve, etc.

　　(4) clip specific. It is the foundation of the whole fixture, and all the components and mechanisms of the fixture are installed on it, making it a whole.

　　(5) Other components and mechanisms. In addition to the above main components and mechanisms, some fixtures also have directional components, indexing mechanisms, locking mechanisms, connectors, springs, pins and bushings.

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