The three-coordinate measuring instrument is not only used in the mold manufacturing industry and the automobile manufacturing industry, but also in the research and manufacturing of the aviation industry.

The coordinate measuring machine​ is a measuring system that detects the three-dimensional coordinates of the surface points of the workpiece through the relative movement of the probe system and the workpiece. By placing the measured object in the measurement space of the CMM, the coordinate position of each measuring point on the measured object is obtained by using a contact or non-contact detection system.

The three-coordinate measuring machine is a new type of high-efficiency precision measuring instrument developed in the past 50 years. Its emergence, on the one hand, is due to the high-efficiency processing of automatic machine tools and CNC machine tools, and the processing of more and more complex-shaped parts requires fast and reliable measuring equipment.

In addition to the four geometric errors of positioning error, straightness error, angular motion error, and perpendicularity error, the CMM​ also has four geometric errors due to force deformation, thermal deformation, measurement system, probe system, control system, data recording and processing.

CMMs are robust and easy to maintain, but they are not completely maintenance-free. Sensitive CMM measurement systems require a certain level of cleanliness. Fine dust particles on probe assemblies or standard ceramic balls can affect measurement accuracy. In addition, the measuring table must be maintained daily. Maintenance measures include regular cleaning and inspection of several components.

Coordinate Measuring Machines (CMMs) enable tolerance testing of increasingly demanding parts.

During the calibration, the probe of the coordinate measuring machine will be affected by many factors, such as: dirty stylus, wrong input of stylus length, wrong input of sphere diameter, etc., which will affect the accuracy of the measurement.

The measurement method​ is a method to obtain the measurement result according to a given measurement principle.