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This paper describes the effect of the run-out on the tool wear and the cutting force in micro ball end milling. The cutting tests were carried out with the micro ball end mill that has a geometry consisting of two flutes and the radius of 200 m. The run-out was generated by inserting the micro ball end mill and the shim in the collet. The spindle speed was fixed at a constant value of 15000 min -1 minimized the repeatable run-out and the non-repeatable run-out. When the thickness of shim was varied in 0.01, 0.03, and 0.05 mm, the run-out was 6, 20, and 38 m respectively. As a result, the difference of maximum flank wear in two flutes increased with an increase in the run-out. The difference of the maximum flank wear in two flutes increased near the center of the micro ball end mill. The average cutting force was not dependent on the run-out, however, the difference of the cutting force acting on two flutes increased with an increase in the run-out.

Effect of Run-Out on Tool Wear Characteristics and Cutting Forces in Micro Ball End Mill