Twist drill is a tool for drilling round holes of workpieces by rotating cutting relative to a fixed axis. It is named because of the spiral shape of the chip flute, which resembles a twist.
Twist drill is a tool for drilling round holes of workpieces by rotating cutting relative to a fixed axis. It is named because of the spiral shape of the chip flute, which resembles a twist. Spiral grooves have 2 grooves, 3 grooves or more, but 2 grooves are the most common. Twist drills can be clamped on manual or electric hand-held drilling tools or drilling machines, milling machines, lathes and even machining centers. The material of the drill bit is generally high-speed tool steel or cemented carbide.