Commonly used drills for woodworking drilling machines include S-shaped drills, square drills, and twist drills. S-type drill bit, used to drill round eyes and elongated eyes. The ends of the elongated eyes are semi-circular.

The square drill is composed of a drill sleeve and a drill core.
 
The drill sleeve is equipped with a helical drill core (spiral drill bit) for drilling square holes. The square drill is a comprehensive drilling tool. The function of the drill core is to drill holes, and the function of the drill sleeve is to cut the surrounding of the hole into square corners.

When assembling the square drill, first install the clamp on the head plate, the drill sleeve is placed on the clamp, and the drill core is installed in the drill card.

twist drill

Twist drills are also divided into ordinary-grade twist drills and cobalt-containing twist drills. Of course, the people who use cobalt-containing twist drills are wrong, because the price is relatively expensive.

The twist drill bit is used to drill round holes. There is an included angle between the two cutting edges at the end of the drill bit. The included angle is the sharp angle of the drill bit. The sharp angle of the front angle is small and the drilling is sharp. The front angle should be small, and the front angle of drilling soft wood should be large.

Woodworking row drills, as the name suggests, are dedicated to row drilling rigs. Drilling is divided into left and right. A friend also said positive and negative. Right turns are usually used more often. That is, forward rotation, or forward rotation. The most common specifications for row drills are 8mm, 10mm, and 15mm.