Electric drills can be divided into three categories: handheld drills, impact drills, and hammer drills.
1. Hand drill: Low power, limited to drilling wood and being used as an electric screwdriver. Some hand drills can be converted into specialized tools according to their purpose, with a variety of uses and models.
2. Impact drill: There are two types of impact mechanisms for impact drills: dog tooth and ball bearing. The ball type impact drill consists of a moving disc, a fixed disc, steel balls, etc. The rotor is connected to the spindle through threads and has 12 steel balls; The fixed plate is fixed on the casing with pins and has 4 steel balls. Under the action of thrust, 12 steel balls roll along the 4 steel balls, causing the hard alloy drill bit to produce rotational impact motion, which can drill holes in brittle materials such as bricks, blocks, and concrete. Remove the overhead pin, allowing the fixed disc to rotate together with the moving disc without producing any impact, and can be used as a regular electric drill.
3. Hammer drill (electric hammer): It can drill holes in various hard materials and has a wide range of applications.
The prices of these three types of electric drills are arranged from low to high, and their functions also increase accordingly. The selection needs to be based on their respective applicability and requirements.
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.
There is an adjustment knob at the drill bit clamp during the operation of the impact drill, which can be used in two ways: adjustable drill and impact drill. However, the impact drill utilizes the mutual jumping of gears on the inner shaft to achieve the impact effect, and the impact force is far less than that of an electric hammer. It can also drill reinforced concrete, but the effect is not satisfactory.
Hammer drill (electric hammer) is different. It uses a bottom motor to drive two sets of gear structures, one to drill and the other to drive the piston, like the hydraulic stroke of an engine, generating a strong impact force that accompanies the drilling effect. Strength can split stones into gold.
Electric pickaxe is a device that uses a motor to drive a swinging weight to bounce and produce a chiseling effect on the ground. The hydraulic pump pick uses the gas pressure transmitted by the air compressor to drive the pump hammer in the electric pick to bounce back and forth, thereby producing the effect of the pick chiseling the ground. However, the electric pick only chisels, and its pick does not rotate.
In summary, electric drills can only drill, while impact drills can also have a slight hammering effect. Hammer drills can drill with higher hammer strikes, while electric pickaxes only do hammer strikes and cannot drill.

The main types of electric drills are hand drills, impact drills, and hammer drills (electric hammers). Here is a detailed introduction:
Electric hand drill. The power is relatively small, mainly used for drilling wood and as an electric screwdriver. Some hand drills can be converted into specialized tools according to their purpose, with a variety of uses and models.
Impact drill. Relying on rotation and impact to work, it is mainly suitable for punching holes on concrete floors, walls, bricks, stones, wooden boards, and multi-layer materials. In addition, it can also drill holes and tap teeth on wood, metal, ceramics, and plastics.
Hammer drill (electric hammer). It can drill holes on various hard materials and has a wide range of applications.

Metal processing machinery is an indispensable equipment in industrial manufacturing, and its operation requires high precision and safety. When using metal processing machinery, the following aspects should be noted:
1、 Operating standards
1. Strictly follow the operating procedures to ensure that the machinery operates within the preset safety parameter range.
2. Necessary training should be conducted before operation to familiarize oneself with the performance and characteristics of the machinery and avoid misoperation.
2、 Security protection
When using machinery, it is necessary to wear professional safety protection tools, such as professional gloves, safety goggles, etc.
2. Safety warning signs should be set up in the machining area to prevent others from entering the dangerous area by mistake.
3. Mechanical equipment should be equipped with protective devices such as shields, safety doors, etc., to ensure that operators can be protected in dangerous situations.
3、 Equipment inspection and maintenance
1. Regularly check the operation status of mechanical equipment to ensure that all components are functioning properly.
2. Regularly maintain and upkeep the machinery to maintain its good condition.
3. If any abnormal situation is found, the machine should be stopped for inspection in a timely manner to avoid the fault from expanding.
4、 Material processing
1. Before processing, strict inspection should be carried out on the materials to ensure that they meet the processing requirements.
2. The loading and unloading of materials should follow regulations to avoid accidents caused by overloading or imbalance.
During the processing, attention should be paid to the temperature changes of the materials to prevent mechanical failures or safety accidents caused by excessive temperature.
5、 Environmental control
1. The machining area should be kept clean to avoid debris interfering with the operation of the machinery.
During the processing, attention should be paid to controlling pollutants such as noise and dust to protect the environment and the health of employees.
3. Maintain appropriate temperature and humidity to ensure that the machinery operates under suitable environmental conditions.
6、 Emergency Management
1. The machining area should be equipped with emergency equipment and tools, such as fire extinguishers, first aid kits, etc.
2. Operators should understand the emergency response process and be able to quickly take measures in case of an emergency.
3. Regularly conduct emergency drills to improve employees' ability to respond to unexpected events.
In short, the use of metal processing machinery needs to be strictly regulated

With prolonged use of electric tools, carbon brushes may experience normal wear and tear; When not in use for a long time, the motor may also become stuck in the carbon brush holder due to expansion and deformation caused by moisture, resulting in the motor not being able to operate normally. At this point, please replace the 'carbon brush' according to the instructions in the product manual

If the tool still cannot function properly after replacing the carbon brush, the product is likely to require repair and maintenance. In addition, products that do not include the content of "inspection and replacement of carbon brushes" in the product operation manual belong to models where users cannot replace carbon brushes on their own