1. Introduction The CMM (hereafter referred to as CMM) has been greatly developed in the past 19 years since the invention of the British company Fementi in 1959. Especially after nearly two decades of development and application, it has become more popular in the field of machinery manufacturing. However, with the development of science and technology, there are still some ideas that need to be improved, especially the development of ultra-precision processing technology, which has led to more ideas. And now
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