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3M tools powered by electric motors or electromagnets, driving the working head through a transmission mechanism, are referred to as power tools. These are hand-held tools that use low-power electric motors or electromagnets as the power source to drive the working head via a transmission mechanism. Power tools are categorized into handheld and portable types; handheld power tools offer greater flexibility, convenience, and wider application. Many varieties have become essential tools for production and daily life. With numerous brands available, power tools are mainly classified by function and usage into metal cutting power tools, grinding power tools, assembly power tools, and railway power tools. Common power tools include electric drills, electric grinders, electric wrenches and electric screwdrivers, electric hammers and hammer drills, concrete vibrators, and electric planers.

3M tool classification

1) Metal cutting power tools: This category mainly includes electric drills, magnetic base drills, electric reamers, electric knives, electric shears, electric punch shears, electric reciprocating saws, electric pipe sawing machines, electric tapping machines, electric profile cutting machines, electric miter saws, electric weld seam bevelling machines, and multifunctional power tools. 2) Sanding and grinding power tools: This category includes straight grinders, angle grinders, flexible shaft grinders, die grinders, orbital sanders, belt sanders, straight polishers, and disc polishers. 3) Assembly power tools: This category includes electric wrenches, torque-controlled electric wrenches, electric screwdrivers, electric rivet guns, self-tapping electric screwdrivers, and electric pull rivet guns. 4) Construction and road power tools: This category includes concrete vibrators, electric hammers, hammer drills, impact drills, electric chisels, electric floor polishers, electric stone cutters, expansion bolt wrenches, wet grinders, electric steel disc cutters, electric threading machines, electric pipe bending machines, electric engineering drills, electric scrapers, and electric brick wall milling machines.

3M tool selection

Points to note when selecting power tools: First, a power tool is a handheld or portable mechanical tool powered by an electric motor or electromagnet, which drives the working head through a transmission mechanism to perform tasks. Power tools feature portability, simple operation, and diverse functions, significantly reducing labor intensity, improving work efficiency, and mechanizing manual operations. Therefore, they are widely used in construction, housing decoration, automotive, machinery, electricity, bridges, gardening, and other fields, and have extensively entered households. Characteristics of power tools include lightweight structure, small size, light weight, low vibration, low noise, flexible operation, ease of control and handling, portability, robustness, and durability. Compared to manual tools, they can increase labor productivity by several to dozens of times; compared to pneumatic tools, they offer higher efficiency, lower costs, and easier control.

3M tool usage

1) Before use, carefully inspect the tool to ensure there is no external damage, the switch operates flexibly without sticking, and the power cord and tool housing are intact. Use a 500V megohmmeter to measure the insulation resistance between the winding and the housing; the value must not be less than O.5 MΩ. Refer to the attached table for insulation resistance values. 2) Handheld power tools with metal housings must have a reliable protective grounding wire. The power cord should be a multi-core soft rubber-sheathed cable, with the grounding protection wire securely connected at both ends. 3) Handheld power tools should be operated by dedicated personnel with appropriate professional knowledge. Strictly adhere to relevant safety operating procedures during use. 4) Before use, check that all related electrical and mechanical protective devices are intact and functioning normally. Also, ensure that rotating parts move flexibly without sticking. 5) When using Class I handheld power tools, operators must wear prescribed protective equipment and use qualified protective gear. Implement corresponding anti-electric shock safety measures as required, such as installing residual current devices (RCDs) in the power circuit, or having the operator wear insulating gloves, insulating shoes, or stand on an insulating mat. When using Class II handheld power tools in damp and confined spaces, install a residual current circuit breaker (RCCB) with an operating current of less than 1.5mA and an operating time of ≤ 0.1 seconds. The RCCB should be placed inside the container and monitored by a dedicated person. 6) Occupational hazards associated with using handheld power tools. Arm vibration disease caused by long-term exposure to hand-transmitted vibration was listed as one of China's statutory occupational diseases in 1957, also known as local vibration disease, typically manifested by episodic white finger.

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