How many types of drill bits are there by purpose?

Drill bits are divided into two types: hard alloy drill bits and diamond drill bits. The cutting edge hardness of hard alloy drill bits is HB250~300, characterized by wear resistance and impact resistance, and can be used to drill various hard rocks. The cutting edge hardness of diamond drill bits is HB1000~3000, which is characterized by no wear and can be used to drill various soft rocks. Drill bit is a tool used in geological exploration, mining, water conservancy engineering, railway bridge and other engineering construction. There are many types of drill bits, including geological drill bits, engineering drill bits, and petroleum drill bits according to their uses; According to the structural form, there are three main types: integral (integral hard alloy drill bit), welded (integral diamond drill bit), and clamp type (integral hard alloy drill bit, integral diamond drill bit). According to the drilling method, they are further divided into active drilling drill bit and passive drilling drill bit.

What is the difference between woodworking drill bits and metal drill bits?

Different materials: Black drill bits are generally used for drilling metal, and the drill bit material is usually high-speed steel. When drilling on general metal materials (alloy steel, non alloy steel, cast iron, cast steel, non-ferrous metals), metalworking drill bits are used in conjunction.

Drilling tools for drilling

The general term for the entire drilling pipe column and its joints used in drilling construction (excluding casing for borehole protection). The drilling tool consists of an active drill rod, a drill rod, a core tube, and a bottom end reamer and drill bit. If necessary, a settling tube or drill collar may be added to the upper part of the core tube. The main function of drilling tools is to transmit drill bit pressure and rotational torque to the drill bit during the drilling process of rock formations, and to deliver drilling flushing fluid to the bottom of the hole to collect rock and mineral cores.

The difference between electric drills, impact drills, hammer drills, and pickaxes

A handheld electric drill simply relies on a motor to drive the transmission gear and increase the rotational force of the drill bit, allowing it to scrape through materials such as metal and wood.

Electric drills can be divided into three categories

Handheld electric drill: The power is the smallest, and its use is limited to drilling wood and as an electric screwdriver. Some handheld electric drills can be converted into specialized tools according to their purpose, and there are many uses and models available 2. Impact drill: There are two types of impact mechanisms for impact drills: dog tooth and ball bearing.