DEWINNER 20V Cordless Angle Grinder Instruction Manual

1. Important Safety Instructions

Always observe basic safety precautions when using this cordless angle grinder to reduce the risk of fire, electric shock, and serious personal injury. Read all instructions before operating the tool.

• Personal Protective Equipment (PPE): Always wear safety glasses, hearing protection, and appropriate gloves. A dust mask is recommended for dusty operations.
• Work Area Safety: Keep the work area clean and well-lit. Do not operate power tools in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust.
• Electrical Safety: This is a cordless tool; ensure the battery and charger are used in dry conditions. Do not expose the tool to rain or wet conditions.
• Tool Use and Care: Do not force the power tool. Use the correct power tool for your application. Disconnect the battery pack before making any adjustments, changing accessories, or storing the tool.
• Kickback and Related Warnings: Always maintain a firm grip on the tool. Be aware of the potential for kickback, especially when the disc binds or gets caught.
• Battery Pack Use and Care: Recharge only with the charger specified by the manufacturer. Do not disassemble the battery pack. Do not short-circuit a battery pack.

2. Product Overview

The DEWINNER 20V Cordless Angle Grinder is a versatile and portable tool designed for cutting and grinding various materials. It features a powerful 8500 RPM motor, a 4-1/2 inch wheel diameter, and comes with a 3.0Ah Lithium-Ion battery and fast charger.

Figure 2.1: The DEWINNER 20V Cordless Angle Grinder, showcasing the main unit, 3.0Ah battery, charger, auxiliary handle, wrench, and included cutting and grinding wheels.

Key Features:

• Cordless Flexibility: Portable design with no restrictive power cords, ideal for indoor and outdoor use. Compatible with other DEWINNER 20V Max Lithium-ion Series tools.
• Auxiliary Handle: Reduces vibration and provides enhanced balance, control, and comfort. It can be easily attached to either side of the grinder and includes storage for the wrench.
• Large Wheel Diameter: Supports 115mm (4-1/2") diameter wheels, compatible with most standard replacement discs.
• Strong & Lightweight Design: Features a cast aluminum gear head for durability and reduced weight.
• Electric Brake: Enhances safety by quickly stopping the disc rotation.
• Fast Heat Dissipation: Designed for long-lasting cuts without overheating.
• Double Insulation: Provides double protection against electrical leakage.
• Dust Protection Design: Helps protect internal components from dust ingress.

Figure 2.2: Detailed view of the angle grinder with key components labeled, including the two-position auxiliary handle, soft grip, safety button, on-off switch, wheel cover, and spindle lock.

Figure 2.3: Illustration highlighting the internal double insulation and fast heat dissipation features of the grinder.

3. Setup

3.1 Charging the Battery

Before first use, fully charge the 20V Max 3.0Ah Lithium-Ion battery. Connect the fast charger to a standard power outlet and insert the battery pack into the charger. The charger's indicator light will show the charging status. Once fully charged, remove the battery from the charger.

3.2 Installing the Battery

Align the battery pack with the battery port on the grinder handle and slide it in until it clicks securely into place. Ensure it is firmly seated before operation.

3.3 Attaching the Auxiliary Handle

The auxiliary handle can be screwed into either of the two threaded holes on the grinder's gear housing. Choose the position that provides the most comfortable and controlled grip for your application. Tighten securely by hand.

3.4 Adjusting the Wheel Guard

The wheel guard protects against sparks and debris. It can be rotated to the desired position by loosening its clamp, adjusting, and then re-tightening. Ensure the guard is positioned to deflect debris away from you.

Figure 3.1: The metal guard and the two-position auxiliary handle, demonstrating their adjustability and importance for safety and ergonomics.

3.5 Installing/Changing Discs (Cutting/Grinding Wheels)

1. Press the Spindle Lock Button: Locate the spindle lock button on the grinder head. Press and hold it to prevent the spindle from rotating.
2. Loosen the Flange Nut: Use the included wrench to loosen and remove the outer flange nut.
3. Place the Disc: Position the desired 4-1/2 inch (115mm) cutting or grinding wheel onto the inner flange, ensuring it is centered.
4. Secure the Flange Nut: Replace the outer flange nut and tighten it firmly with the wrench while still holding the spindle lock button. Do not overtighten.
5. Release Spindle Lock: Release the spindle lock button.

Figure 3.2: Visual guide for quick installation of cutting/grinding wheels, showing the use of the spindle lock button and wrench.

4. Operating the Angle Grinder

4.1 Starting and Stopping the Tool

To start the grinder, first press the safety button (located on the side of the handle) and then depress the ON/OFF switch. To stop the tool, release the ON/OFF switch. The electric brake will quickly stop the disc rotation.

Figure 4.1: Location of the safety button to prevent accidental startup and the three-dimensional outlet for heat dissipation.

4.2 Proper Grip and Control

Always hold the grinder firmly with both hands, one on the main handle and one on the auxiliary handle. Maintain a balanced stance. Ensure the work piece is securely clamped or held.

4.3 Cutting and Grinding Techniques

• Cutting: Use a cutting disc. Apply light, consistent pressure. Allow the disc to do the work. Avoid twisting or binding the disc in the cut.
• Grinding: Use a grinding disc. Hold the grinder at a slight angle (typically 15-30 degrees) to the workpiece. Move the grinder smoothly across the surface.
• Material Compatibility: This grinder is suitable for various materials including metal, stone, and tile, depending on the disc used.

Figure 4.2: The angle grinder in operation, demonstrating its use for cutting metal, highlighting the sparks generated during the process.

Figure 4.3: Examples of versatile applications for the angle grinder, including cutting various materials and surface preparation.

5. Maintenance

Regular maintenance ensures the longevity and safe operation of your DEWINNER Angle Grinder.

• Cleaning: After each use, clean the tool with a soft cloth. Use compressed air to blow dust out of the ventilation openings. Do not use water or chemical cleaners.
• Disc Inspection: Regularly inspect cutting and grinding discs for wear, cracks, or damage. Replace worn or damaged discs immediately.
• Guard Inspection: Ensure the wheel guard is securely attached and free from damage.
• Battery Care: Store the battery in a cool, dry place away from direct sunlight and extreme temperatures. Do not store fully discharged batteries for extended periods.
• Storage: Store the grinder and its accessories in a dry, secure location out of reach of children.

6. Troubleshooting

7. Specifications

Figure 7.1: Dimensional overview of the DEWINNER Angle Grinder and its compatible 115mm grinding wheel.

Figure 7.2: Illustration of the powerful motor, capable of reaching 8500 RPM, which is central to the grinder's performance.

8. Warranty and Support

The DEWINNER 20V Cordless Angle Grinder comes with a 2-year extended warranty. This warranty covers defects in materials and workmanship under normal use.

For warranty claims, technical support, or any inquiries regarding your product, please refer to the contact information provided in your product packaging or visit the official DEWINNER website. When contacting support, please have your model number (VPCD2255) and purchase details ready.

For additional resources and product information, you may visit the DEWINNER Store on Amazon.