A coordinate measuring machine (CMM) is a device for measuring the physical geometrical characteristics of an object. Coordinate-measuring machines include three main components:

The main structure which include three axes of motion. The material used to construct the moving frame has varied over the years. Granite and steel was used in the early CMM's.

Today all the major CMM manufacturers build frames from aluminum alloy or some derivative and also use ceramic to increase the stiffness of the Z axis for scanning applications.

Few CMM builders today still manufacture granite frame CMM due to market requirement for improved metrology dynamics and increasing trend to install CMM outside of the quality lab.

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