Principles of measurement

The previous chapter talked extensively about workpiece accuracy with out clearly defining the term accuracy. Taniguchi talks of precision, accuracy and smoothness but not repeatability. For our purposes, we are interested in accuracy, repeatability and resolution. Different authors on precision engineering have slightly differing views of the definitions of these terms. Let’s cover each one in order. This chapter includes discussions centering on concepts of statistics. It is assumed that the reader is familiar with the basics of statistics, especially Gaussian distributions, t-distributions, variance and standard deviation, etc. so those will not be defined in detail here. There are a number of excellent references on this that can be easily found.


Machine Tool Tool Wear Surface Profile Ductile Cast Iron Angular Motion 
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© Springer Science+Business Media, LLC 2008

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