Abstract
This chapter provides an overview on miniature coordinate measuring machines (CMMs). An understanding of the operation of normal industrial CMMs will help in the understanding of the principles of miniature CMMs. A CMM is a measuring system with the means to move a probing system and capability to determine spatial coordinates on the surface of the part being measured. CMMs measure either by single point probing, where data from single points on the surface are collected, or by scanning, where data are collected continuously as the stylus tip is dragged across the surface. The stylus tip in contact with the surface is usually a synthetic ruby ball, although other geometries are possible, for example cylindrical stylus tips. The data collected by the CMM are essentially ball centre data. The stylus in contact with the surface, therefore, needs to be qualified to determine the effective stylus radius and the position of the centre of the tip relative to some reference point.
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