Abstract: Transforming the CL data produced by CAD/CAM software into NC codes is needed in
industrial areas. The application of D-H modified notation method in five-axis machine tools
postprocessor development is studied. The process of parameter definition is described in D-H
modified method and the improvement is put forward. A special postprocessor of DMU 80
monoBlock five-axis machine tool is developed. At last, a simulation is made to verify the validity of
the postprocessor by VERICUT. This program has some guiding significance in increasing the
efficiency of data conversion in free-form surface five-axis machining.

Key words: five-axis machining, postprocess, D-H modified notation method, form shaping function
matrix