A three-coordinate measuring instrument is an instrument capable of expressing measurement capabilities such as geometry, length, and circumferential indexing in a spatial range of a hexahedron, and is also called a coordinate measuring machine or a three-coordinate measuring bed.
The coordinate measuring machine can also define "a detector with three directions of movement, which can be moved on three mutually perpendicular guide rails. The detector transmits signals in a contact or non-contact manner, and the displacement of the three axes. A measuring system (such as a grating scale) calculates a point (x, y, z) of the workpiece and an instrument for measuring various functions via a data processor or a computer. The measurement function of the coordinate measuring machine should include dimensional accuracy, positioning accuracy, geometric accuracy and contour accuracy.