What is a coordinate measuring instrument?

three-coordinate measuring instrument refers to a hexahedron within the scope of the space, can show the geometric shape, length and circumference of the measurement ability of the instrument, also known as three coordinate measuring machine or three coordinate measuring bed. The three-axis coordinate measuring instrument can also be defined as "an instrument with a detector that can move in three directions and can move on three mutually perpendicular guide rails. The detector transmits signals in a contact or non-contact manner. The displacement measuring system of three axes (such as grating ruler) calculates each point (x,y,z) and each function measurement of the workpiece through a data processor or a computer". The measurement function of CMM shall include dimensional accuracy, positioning accuracy, geometric accuracy and contour accuracy.

Its functional principle is as follows:

Simply put, the three-coordinate measuring machine has a guiding mechanism, a length measuring element, a digital display device in three mutually perpendicular directions, and a worktable capable of placing workpieces (large and giant are not necessarily available). The measuring head can be moved to the measured point briskly manually or motorized, A measuring device that displays the coordinate values of the measured point by a reading device and a digital display device. Obviously this is the simplest and most primitive measuring machine. With this measuring machine, the coordinate values of any point in the measuring volume can be displayed by the reading device and the digital display device. The sampling point sending device of the measuring machine is a measuring head, which is equipped with a grating ruler and a reading head along the directions of the three axes of X,Y and Z. The measurement process is that when the probe contacts the workpiece and sends out the mining point signal, the control system collects the coordinate values of the current machine tool three-axis coordinates relative to the machine tool origin, and then the computer system processes the data.