An easy-to-handle elastic deformation mechanism has been built into the cutting edge unit of the cutter body. This mechanism makes it easy for an unskilled worker to adjust the axial runout of face cutting edges to 2 μm or less, which is necessary to finish the workpieces to a surface roughness of JIS Ra 1.6 or better. Previously, it was very difficult for even a skilled worker to adjust the axial runout of cutting edges to such a high accuracy.
Indexable inserts with a rectangular cutting face are alternately arranged lengthwise and crosswise around the circumference and on the face of the cutter body in order to optimize the numbers of corners and cutting edges in use. This cutting edge arrangement dramatically suppresses chatter vibration of the cutting edges, which leads to high-efficiency, high-accuracy surface finishing.
With an accurately sintered arc-shaped cutting face for each cutting edge, the special purpose inserts achieve a good balance between high quality and economic efficiency in finish-machining. The service life of the milling cutter is also extended by the use of ACK260 and ACK280, which are special materials made by coating numerous layers of highly abrasion-resistant physical vapor deposition (PVD) films.