Abstract：To use a more accurate method to simulate the trajectory of the tip of micro milling process,and decrease the micro cutter tip movement errors. This paper describes the use of trochoidal tip trajectory, and considering the impact on the tool deflection process. Besides, an improved theoretical model was established for the instantaneous chip thickness, the course focused on the tool rotation, the tool deflection and the impact on the amount of feed per tooth momentary cutting thickness, meanwhile, a variety of different cutting thickness models were compared. The simulation results show that the thickness from the model of the instantaneous cutting thickness considering cutting tool deflection was very close to the real trajectory, which verified the accuracy of the improved model. In addition, the thickness of the instantaneous cutting increases with the increases of cutting tool deflection, the greater the feed amount, the more significant the impact.
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