Mingte Machinery Processing Factory is a physical factory with nearly 20 years of industry experience. In the process of professional technology improvement over the years, we have also summarized a lot of basic industry knowledge with practical value. Today we will share some useful CNC machining common sense.

The parts in mechanical processing are composed of several surfaces, and there are certain size and relative position requirements between the surfaces. The relative position requirements between the surfaces of parts include two aspects: the distance dimension accuracy between the surfaces and the relative position accuracy (such as coaxiality, parallelism, verticality and circular runout, etc.). The study of the relative position relationship between the surfaces of parts is inseparable from the benchmark. If the benchmark is not clear, the position of the surface of the part cannot be determined. In general, the benchmark is the point, line, and surface on the part that is used to determine the position of other points, lines, and surfaces. According to their different functions, the benchmark can be divided into two categories: design benchmark and process benchmark.

The datum used in the process of part processing and assembly is called process datum. According to different uses, process datum is divided into positioning datum, measurement datum and assembly datum.

(1) Positioning datum: The datum used to make the workpiece occupy the correct position in the machine tool or fixture during processing is called positioning datum. According to the different positioning elements, the most commonly used are the following two categories:

Automatic centering positioning: such as three-jaw chuck positioning.

Location sleeve positioning: The positioning element is made into a positioning sleeve, such as stop plate positioning

Others include positioning in V-shaped frame, positioning in semicircular hole, etc.

(2) Measurement datum: When inspecting parts, the datum used to measure the size and position of the processed surface is called measurement datum.

(3) Assembly datum: The datum used to determine the position of the part in the component or product during assembly is called assembly datum.

Basic knowledge of mechanical processing, if you don't understand it, you will be OUT!