Fujian traditional mahogany carving knife with iron handle

The process of dulling the cutting edge of carving is called "chamfering", and the width of chamfering is related to the material to be cut, generally between 0.03 and 0.25 mm, and the process of chamfering the edge of cutting edge (tool tip) is called "chamfering".

In the end milling cutter, the edge on the circumferential surface is the main cutting edge. The cutting edge on the end face is the second cutting edge.

Difference between HM bit and HSS bit

HSS bit-the top angle is generally 1 18 degrees, and sometimes it is greater than 130 degrees; A sharp blade; The requirements for accuracy (blade height difference, symmetry and circumferential runout) are relatively low. There are many ways to repair the cross blade.

HM position-vertex angle is generally 140 degrees; Straight-slot drills are often 130 degrees, and triple-edged drills are generally 150 degrees. The blade and tip (at the edge of the blade) are not sharp and often passivated, or chamfering and chamfering; Require high precision. Cross blades are usually modified to be S-shaped to facilitate chip breaking.