Coordinate measuring machine.

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written 7.9 years ago by

It is the most prominent example used for the contact inspection of work parts. A CMM consist of a table which holds the part in a fix registered position and a movable head which holds a sensing probe. The probe can be moved in three dimensions corresponding to the x, y and z coordinates. During operation, the probe is brought into contact with the part surface to be measured and the three coordinate positions are indicated to a high level of accuracy. Typical accuracies of these machines are in the neighborhood of + 0.0002in (0.0051mm).

Today’s coordinate measuring machines are computer controlled. The operation of the machine is similar to a NC machine tool in which the movement of the measuring probe is either tape controlled or computer controlled. Programs and coordinate dada can be downloaded from a central computer, much in the manner of direct numerical control. Also similar to DNC is the capability to transmit data from the CMM back up to the host computer.

Its main advantages are it saves inspection time, only 5-10% time is required on a CMM compared to traditional inspection methods and there is also a consistency in the measuring of parts.

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