Abstract: To achieve visual simulation of the computerized numerical control (CNC)
on-machine Verification (OMV) system, this paper developed a simulation software of OMV
system with OpenGL. The simulation system reads the STL model files to display the part,
parse the XML measure-direct files which contain the coordinates of theoretical data to
display the theoretical points, receive the data from the CNC system to achieve the real time
simulation of the OMV system. Finally, the simulation system is verified with STL files from
CATIA.

Key words: on-machine verification, visual simulation, OpenGL, STL file