Used COORDINATE MEASURING equipment


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A Coordinate Measuring Machine or CMM is used for the three-dimensional measurement of parts in Cartesian coordinates. The Cartesian coordinate system is the X, Y, and Z measurement system used on most blueprints.

There are four major components of CMM equipment:

    • Machine
    • Probing system
    • Computer system
    • Measuring software
In it's fundemental use, the object to be measured is secured to the body of the machine. Keeping the object secure and stable during the measurement process is an important quality of the machine.

The object is then probed point by point with a ruby ball tip. At the point of probe contact, the displacement of the X, Y, and Z axis is read at the scales. There are a variety of probing systems, some systems are better suited to probe more complex shaped objects.

The probe can be either a non-contact or a contact probe. Lasers, space sensors, and edge sensors (which determines the lines between light and shadow) are examples of non-contact probes. Touch-trigger probe and piezoelectric probe are examples of contact probes.

The machine's overall measurement capabilities and ease of use depend on the CMM software used. Not all software can support advanced features measurement of complex part alignments like offset datum planes or datum target points on complex surfaces. Some software may not support complex surface measuring. Evaluating complex surface shapes like airfoils or valve heads may not be support in all systems.

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