Abstract
This paper deals with the experimental examinations on the machining accuracy in the micro end mill operations. The rigidity of the micro end mill is very low, so that it is deflected by the decrease of the clearance caused by the tool wear of the cutting edge. When the tool wear becomes large against the circumferential form relief, the end mill is deflected further by the contact between the workpiece and the flank face of the tool. The measured radial cutting force becomes very large because of the tool deflection, and in some case, the tangential cutting force changes into negative value. Then, it is found that the machined surface error increases with increase in the deflection due to the wear of the end mill, and that the width of machined groove decreases due to the tool deflection.
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