Abstract: To assure parts' machining precision and to improve productivity, touch probe is used to inspect cylinder of parts on machining centers, thus coordinate of points on features are acquired from numerical control system by a data collecting program, and cylindricity error is calculated by computer. This method has broken the restriction of probe's macro processor that couldn't work out cylindricity error. Data saved in computer are beyond the limited memory of numerical control system, which improves operation speed. This on-machine inspecting method has been tested on horizontal boring-milling machine(DHP50), and compared with the result of coordinate measuring machines. Now it has been applied in the inspection of key parts in some research institute.

Key words: on-machine inspecting, data acquisition, cylindricity error