Investigation of geometric groove accuracy in micro end milling (2 nd report) - Wall position error in side milling

In previous paper, groove position error and groove warp are substantially generated in micro tool -width end milling process. Therefore, finish milling following the tool-width milling is required to append for improving the groove accuracy. In this paper, it is discussed experimentally how to mill on side walls with position error or groove warp on finish milling. It is made clear that up-milling is less influential on the position error on a side wall than down-milling, because cutting force in down-milling is more cumulative in forming a chip segment from engaging rotating angle to a side wall angle(6=n), although cumulative cutting force to mill a side wall can be ignored in up-milling. As the above-mentioned reason, up-milling is recommended as finish milling in order to remove a position error and groove warp on side walls.