The difference between twist drill and impact drill

The difference between twist drill and impact drill

1. The impact drill is improved on the basis of the twist drill to make it suitable for various operating requirements. The shape can be understood in this way. The twist drill is a simple handle + spiral, and the impact drill is mostly handle + spiral + flat head.

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

3. The impact drill relies on rotation and impact to work. A single impact is very light, but a frequency of more than 40,000 impacts per minute produces continuous force. Can be used on natural stone or concrete. When the impact drill is working, there is an adjustment knob at the drill chuck, which can be adjusted in two ways: ordinary hand drill and impact drill. However, the impact drill uses the gears on the inner shaft to beat each other to achieve the impact effect, but the impact force is far less than that of the electric hammer. It is not suitable for drilling reinforced concrete.

Electric drills can be divided into 3 categories: hand drills, impact drills, and hammer drills.

1. Electric hand drill: The power is the smallest, and the scope of use is limited to drilling wood and being used as an electric screwdriver. Some electric hand drills can be changed into special tools according to the purpose, and there are many uses and models.

2. Impact drill: The impact mechanism of the impact drill has two types: the dog tooth type and the ball type. The ball impact electric drill consists of a moving plate, a fixed plate, and steel balls. The moving plate is connected to the main shaft through threads and has 12 steel balls; the fixed plate is fixed on the casing by pins and has 4 steel balls. Under the action of thrust, the 12 steel balls roll along the 4 steel balls. Make the cemented carbide drill bit produce rotary impact motion, which can drill holes in brittle materials such as bricks, blocks, and concrete. Take off the pin, so that the fixed plate rotates with the movable plate without impact, and can be used as an ordinary electric drill.

3. Hammer drill (electric hammer): it can drill holes in a variety of hard materials, and has the widest range of applications.