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Watch Solutions for Hard Milling
Makino demonstrates the latest techniques and technologies for high-speed machining of hardened materials for die or mold applications. Check out tips, tricks, and new technologies you can use to mill the toughest steels, shortening your lead times, lowering your costs, and eliminating bench work.

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The video is of a piece of A2 at 60 Rockwell. The cutter itself is a four-fluted ballnose endmill. It is the true ball design by OSG. It is a 12 millimeter diameter ballnose endmill, cutting at a spindle speed of 5,040 rpm. The feedrate is 76 inches per minute. The step over is four thou worth of stock or step over radially X and Y. The stock that it is taking is about four thou off the top of the part. As you can see here they are actually using for this type of finishing tool a solid shrink fit holder - one piece because it is a finish cutter.