Bit different from the mill is a side free edge, in addition to the drill main cutting edge, the outer edge of the undercut edge tip for cutting fibers, the side hole is flatter
The difference between the drill bit and the end mill is that the side is edgeless, the drill bit has a sharp cutting edge on the outer edge, which is used to cut the fiber sands and make the side of the hole more smooth.
The difference between the drill and the end mill is that there is no edge on the side. In addition to the main cutting edge, the drill has a sharp countersunk cutting edge on the outer edge to cut the fiber and make the side of the hole more flat<br>