In order to solve the calibration problem of the application of REVO 5-axis system,which was designed to be applied in the orthogonal coordinate measuring machines(CMMs)and non-orthogonal CMM,some techniques based on symmetrical and reversal principle for calibrating the parameters and error items of REVO probe head were proposed and discussed in detail.The calibration of the parameters and error items of REVO probe head in the non-orthogonal CMM was realized only by measuring some gauge blocks with one CMM...