Safe operation is of Paramount importance when using power tools. The following are common power tools (such as drill, Angle grinder, electric circular saw, electric screwdriver, etc.) general use methods and safety guidelines:

### ** I. Preparation before use **

1. ** Check the tool status **

- Power cable/battery: no damage (plug-in), sufficient power (charging).

- Blade/drill: firmly installed, no cracks or wear.

- Protective devices: such as the shield of the Angle grinder and the brake of the saw are normal.

2. ** Wear protective gear **

** * Required ** : goggles, dust mask, anti-cut gloves (need to be fitted to avoid being involved).

- ** Choose to wear ** : earplugs (loud tools), safety shoes (heavy tools).

3. ** Environmental preparation **

- Clean the work area to ensure that the floor is dry and free of inflammables.

- Hold the workpiece (use fixtures or pliers, avoid hand-holding).

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### ** Two, general operating steps **

#### **1. Electric drill/Screwdriver **

- ** Clamp drill ** : Turn off the power and fix the drill with a key or self-locking chuck.

- ** Adjusting gear ** :

- Low speed (high torque) : screw and drill with large aperture.

- High speed (low torque) : small bore hole drilling.

- ** Drilling Tips ** :

- Vertically press down, at the beginning, lightly touch the switch to trigger the anti-slip drill.

- Wood drilling: first use electric drill to make positioning holes; Metal drilling: Apply lubricating oil to cool down.

#### **2. Angle Grinder **

- ** Install grinding wheel/cutting disc ** : Make sure the specifications match and lock the nut with a wrench.

- ** Operating points ** :

- Hold with both hands and place the fuselage on the side of the workpiece (not facing the body).

- Tilt 15°~30° during grinding to avoid direct pressing of the grinding wheel surface.

- ** Danger Warning ** :

- Do not remove the shield! The cutting pieces may splutter and injure people.

#### **3. Electric circular saw/Curve saw **

- ** Adjust the cutting depth ** : the serration slightly exceeds the thickness of the workpiece.

- ** Cutting Tips ** :

- Start the motor after uniform speed, do not force turning (except curve saw).

- Wood cutting: pasting guides or drawing auxiliary lines; Metal cutting: with a special metal saw blade.

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### ** III. Safety precautions **

1. ** Anti-electric shock **

- Do not use the plug-in tools in a humid environment. Keep your hands dry.

- Battery tools Do not expose batteries to water or sunlight.

2. ** Prevent mechanical damage **

- When operating, the body avoids the direction of the tool (such as the risk of rebound of the electric circular saw).

- Shut down and wait for the blade to stop completely before placing the tool.

3. ** Emergency treatment **

- Clamp/drill: immediately release the switch, unplug the power and check again.

- Smoke/abnormal sound: Power off immediately, check the motor or battery.

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### ** Fourth, maintenance after use **

1. ** Clean **

- Remove debris with a brush to avoid clogging vents.

2. ** Store **

- Unplug the power cord and store the battery separately (keep the power level about 50%).

3. ** Regular maintenance **

- Lubricate moving parts (e.g. drill chuck).

- Check carbon brush wear (old motor tools need to be replaced).

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### ** Five, common mistakes **

- ❌ Do not wear safety goggles (iron and wood chips can cause permanent eye damage).

- ❌ Fix small workpieces with bare hands (easy to fly with tools).

- ❌ Replacement parts are powered on (high risk of accidental start).

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### ** Six, power tools purchase recommendations **

- ** Household electric drill ** : 12V~20V brushless motor, with variable speed function.

- ** Carpentry introduction ** : Electric circular saw + curve saw combination.

- ** Metal processing ** : Angle grinder (with metal cutting sheet) + bench drill.

** Tip ** : Be sure to read the instructions before using for the first time to understand the design differences of specific models such as safety locks and speed switches. Safe operation is the premise of efficient work!