Where can I use a ball knife to open the rough? They are all roughly cut with a bull nose milling cutter and a big flying knife, and then the angle is cleared with an alloy flat-bottomed knife, and finally the ball knife is smoothly bent! When the contact surface of the ball knife is less, the resistance is small, but the ball knife is not easy to grind, and once the knife is worn, it can't cut, while the flat-bottomed knife has four blades, which are easy to sharpen and can be sharpened, so the resistance is small.

Take it!