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A CMM (Coordinate Measuring Machine) is a computerized inspection device that measures the physical qualities of a part. CMMs can be operated manually or with the help of a pre-programmed control that automates the inspection process. The CMM software can be built to measure traditional print dimensional requirements or model-based definition (MBD) criteria, which are becoming increasingly common in the industry today, especially in aerospace. Modern designed components have an increasing number of non-prismatic characteristics or sophisticated geometric dimensioning and tolerancing (GD&T) that are difficult to measure without specialized inspection equipment or check fixtures. A CMM allows you to measure these complicated features on a variety of items without having to create bespoke tooling.
The coordinate measuring machine (CMM) has the advantage of being able to accurately measure items that are difficult to measure with other measuring equipment.
With a hand tool like a caliper or micrometer, it’s difficult to measure the three-dimensional coordinates of a specific point (hole, etc.) from the virtual origin. Other measuring machines have difficulty measuring virtual points and virtual lines, as well as geometrical tolerances, which can be measured using a 3D CMM machine.
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