It can be seen from the mode of action of the thread that when the thread is rotated, if it is not forced to “screw in”, the “in” will be the nut. Compared with the milling cutter, it is the chips cut off during milling. It can be seen that when the rotation direction of the milling cutter remains unchanged, the chip removal direction of the left and right rotary milling cutter is also different.

　　 Because in milling, the rotation direction of the left-hand milling cutter must be the same as that of the right-hand milling cutter, in order to change the chip removal direction. Therefore, for the left-handed milling cutter with the purpose of changing the chip removal direction, the cutting edge direction must also be the same as that of the right-handed milling cutter, that is, “right cutting”.

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