Abstract
As high-precision parts are needed with manufacturing techniques improved. the demand of high-precision machine tools has been increasing They are made to developed the precision measuring skill to maintenance the accuracy of themselves as a matter or course We one paper measured straightness and orthogonality of the square to verify that it is possible for CT(circular test) method by 2-dimensional probe and the square to measure orthogonality Furthemore we compared the result of the study with the computer simulation's to prove its possibility and made an improvement of measuring method.
