Electric hand drill speed regulator circuit diagram:
A hand electric drill is a drilling tool powered by AC power or DC battery. It is a type of hand-held power tool. The largest-selling product in the tool industry, it is widely used in construction, decoration, furniture and other industries. It is used to make holes in or penetrate objects. In some industries, it is also called an electric hammer. Precautions when operating a hand drill:
Check the power cord for damage before use. If so, it must be wrapped with insulating tape. During use, it must not be soaked in water or dragged around, and it must not come into contact with heat sources and corrosive media.
Protective grounding (zero connection) measures must be taken for electric hand drills with metal shells.
Before use, make sure the switch of the electric drill is turned off to prevent the drill from suddenly turning when the plug is inserted into the power socket.
Before use, the electric drill should be idle for 0.5 to 1 minute to check whether the transmission part is flexible, whether there is any abnormal noise, whether the screws are loose, and whether the commutator spark is normal.
When drilling, you should hold the electric drill firmly with both hands. Try not to operate it with one hand. You should master the correct operating posture.
Do not use a drill bit with a notch. Do not press down too hard when drilling to prevent the drill bit from breaking.
Cleaning the cutter head debris, changing the cutter head and other actions must be performed with the power supply disconnected.
For small workpieces, clamps must be used to clamp them, and then a hand drill must be used.
During operation, the drilling force should not be too strong to prevent the drill bit or wire tap from flying out and injuring people.
Check the drill bit carefully for cracks or damage before operation. If found, replace it immediately.
Pay attention to the rotation direction and feed direction of the drill bit.
Turn off the power first and wait until the drill bit stops completely before taking the workpiece away from the tool.
Do not touch the drill bit immediately after processing the workpiece to avoid the drill bit from overheating and burning your skin.
Check the drill bit carefully for cracks or damage before operation. If this is found, replace it immediately.
If you find large sparks on the commutator or overheating of the electric drill during use, you must stop using it and conduct inspections, such as removing dirt, replacing worn brushes, adjusting the spring pressure of the brush holder, etc.
To avoid cutting your fingers, make sure all fingers are away from the workpiece or drill bit (tapping) during operation.
Unplug the power plug in time when not in use. Electric drills should be stored in a dry, clean environment.
Reference: Baidu Encyclopedia: Hand Drill