Development of a Measuring Method for Flatness on Machine Tools : >From measuring Displacement on One Circumference by the Multipoint Measuring Method to caluculation of flatness from several circumferences

In the previous paper we discussed a method for measuring displacement on one circumference. Five sensors are attached to the measuring apparatus. One is rotated and the others detect the rotary errors. In order to measure more precisely, we discuss a method which is separated rotary errors from measured values by coordinated measuring machine on basement plate. This paper describes the method for measuring flatness without using transfer function. This paper shows the experimental results and computer simulation to investigate the theoretical results. In order to get large flatness, we show a method that flatness is calculated from the displacements on several circumferences by least squares.