Machine tools are not CMMs

CMM that are like metal cutting machine tools, are constructed to be as accurate as economically feasible. a CMM is built, its error map is carefully measured using laser interferometry. The error functions for straightness, square ness, linear positioning accuracy and angular errors are measured and tabulated. CMMs are usually housed in well-controlled thermal environments. CMMs do not have significant onboard heat sources. Machine tools have drive motors, preloaded axes and spindles, and receive heat from the cutting process and the sprays of lower-temperature coolant. CMMs do not usually experience significant process loads. Machine tools experience significant process loads. Cutting produces large spindle torques, and the rapidly moving heavy axes produce inertial loads.