BOSCH GBG 35-15 Heavy Duty Double Wheeled Bench Grinder User Manual

1. Product Overview

The BOSCH GBG 35-15 Heavy Duty Double Wheeled Bench Grinder is a professional power tool designed for grinding, sharpening, and smoothing various materials. It features a robust 350 W induction motor and a durable die-cast aluminium housing with ball bearings, ensuring longevity and smooth operation. This tool is suitable for demanding tasks in both factories and workshops.

Figure 1: BOSCH GBG 35-15 Heavy Duty Double Wheeled Bench Grinder. This image shows the complete bench grinder with its two grinding wheels, protective guards, and power switch.

Key Features:

• Powerful Motor: Equipped with a 350 W induction motor for efficient grinding, sharpening, and smoothing.
• Durable Construction: Features a die-cast aluminium housing with ball bearings for enhanced durability and protection against dust and debris.
• Dual Grinding Wheels: Includes two grinding wheels (normal grit 24 and normal grit 60) with a diameter of 150 mm, width of 20 mm, and a 20 mm bore.
• High Speed Operation: Operates at a no-load speed of 3,000 rpm for fast and efficient performance.
• Stable Design: Boasts a sturdy, stable base for secure placement during operation, ensuring user safety and comfort.

2. Safety Instructions

Always adhere to the following safety guidelines to prevent injury and ensure safe operation of the bench grinder.

• Personal Protective Equipment: Always wear safety glasses or a face shield, hearing protection, and appropriate work gloves when operating the grinder.
• Work Area: Ensure your work area is clean, well-lit, and free from clutter. Do not operate the grinder in damp or wet conditions.
• Secure Mounting: The grinder must be securely bolted to a workbench or stable surface before use to prevent movement during operation.
• Guards and Shields: Ensure all protective guards, spark protective covers, and adjustable workpiece supports are correctly installed and adjusted before starting the machine. Never operate the grinder without these safety features.
• Wheel Inspection: Before each use, inspect the grinding wheels for cracks, chips, or damage. Replace any damaged wheels immediately. Ensure wheels are correctly mounted and tightened.
• Proper Use: Apply light, even pressure when grinding. Do not force the workpiece against the wheel, as this can cause kickback or damage the wheel.
• Spark Direction: Position the grinder so that sparks are directed away from flammable materials and other personnel.
• Unplug When Not In Use: Always unplug the grinder from the power source before performing any adjustments, changing wheels, or when the tool is not in use.
• Children and Bystanders: Keep children and bystanders away from the operating area.

3. Package Contents

Upon opening the package, verify that all components are present and undamaged. The standard package includes:

• 1 x BOSCH GBG 35-15 Heavy Duty Double Wheeled Bench Grinder
• Adjustable Workpiece Supports (2 Pcs)
• Steel Protective Guards (2 Pcs)
• Spark Protective Covers (2 Pcs)
• Grinding Wheel - Normal Grit 24
• Grinding Wheel - Normal Grit 60

Figure 2: Visual representation of the package contents, including the grinder, supports, guards, covers, and grinding wheels.

4. Setup Instructions

Follow these steps to set up your BOSCH GBG 35-15 Bench Grinder for safe and effective operation.

1. Unpacking: Carefully remove all components from the packaging. Retain packaging for future storage or transport.
2. Mounting the Grinder: Securely bolt the grinder to a sturdy workbench or stand using appropriate fasteners. Ensure the mounting surface is level and stable to prevent vibration and movement during operation.
3. Install Workpiece Supports: Attach the adjustable workpiece supports to the grinder. These supports provide a stable platform for the material being ground. Adjust them so they are approximately 1.5 mm (1/16 inch) from the grinding wheel surface.
4. Install Protective Guards: Securely fix the steel protective guards over the grinding wheels. These guards protect against flying debris.
5. Install Spark Protective Covers: Attach the transparent spark protective covers (eye shields) to the grinder. Adjust them to provide maximum visibility and protection from sparks and debris.
6. Check Grinding Wheels: Ensure both grinding wheels are firmly tightened onto their spindles. Gently spin the wheels by hand to check for any wobbling or unusual sounds.
7. Power Connection: Connect the grinder to a suitable power outlet (240 Volts). Ensure the power switch is in the "OFF" position before plugging in.

Figure 3: Illustration of key setup steps: securing safety attachments, ensuring wheels are tightened, and operating the grinder.

5. Operating Instructions

Once the grinder is properly set up, you can begin operation. Always prioritize safety.

1. Pre-Operation Check: Before turning on the grinder, re-check all safety guards, workpiece supports, and spark protective covers to ensure they are correctly positioned and secure. Confirm the grinding wheels are free from damage.
2. Starting the Grinder: Turn the power switch to the "ON" position. Allow the grinder to reach full operating speed (3,000 rpm) before beginning any work.
3. Grinding Technique:
   • Hold the workpiece firmly against the adjustable workpiece support.
   • Slowly bring the workpiece into contact with the rotating grinding wheel.
   • Apply light, consistent pressure. Avoid excessive force, which can overheat the workpiece, damage the wheel, or cause kickback.
   • Move the workpiece across the face of the wheel to ensure even wear of the grinding surface.
   • For sharpening, maintain a consistent angle against the wheel.
4. Cooling: For prolonged grinding, periodically cool the workpiece in water to prevent overheating and maintain material integrity.
5. Stopping the Grinder: Once grinding is complete, remove the workpiece and turn the power switch to the "OFF" position. Allow the wheels to come to a complete stop before leaving the machine unattended.

Applications:

The BOSCH GBG 35-15 Bench Grinder is ideal for a variety of applications, including:

• Sharpening tools (e.g., chisels, drill bits, lawnmower blades)
• Grinding and shaping metal parts
• Deburring and smoothing rough edges on workpieces
• Removing rust and preparing surfaces

Figure 4: The bench grinder is suitable for heavy-duty applications in industrial environments like factories and workshops.

6. Maintenance

Regular maintenance ensures the longevity and optimal performance of your bench grinder. Always unplug the tool before performing any maintenance.

• Cleaning: Regularly clean the grinder to remove dust, metal particles, and debris. Use a soft brush or compressed air. Ensure ventilation openings are clear.
• Wheel Inspection: Periodically inspect grinding wheels for wear, cracks, or glazing. A glazed wheel can be dressed with a wheel dresser to restore its cutting surface. Replace severely worn or damaged wheels immediately.
• Guard and Support Check: Ensure all protective guards, spark protective covers, and workpiece supports are securely fastened and in good condition. Replace any damaged components.
• Motor Ventilation: Keep the motor's ventilation slots clear to prevent overheating.
• Power Cord: Inspect the power cord for any signs of damage (cuts, fraying). If damaged, have it replaced by a qualified technician.

7. Troubleshooting

This section addresses common issues you might encounter with your bench grinder.

8. Technical Specifications

Detailed technical specifications for the BOSCH GBG 35-15 Bench Grinder.

Figure 5: Key technical specifications of the grinder, including disc diameter, width, bore, weight, power input, and no-load speed.

9. Warranty and Support

The BOSCH GBG 35-15 Bench Grinder comes with a manufacturer's warranty and dedicated customer support.

• Warranty Period: This product is covered by a 1-year warranty from the invoice date. An invoice copy is required for all warranty claims.
• Customer Service: For more details about BOSCH Power Tools, warranty claims, or technical assistance, please contact BOSCH customer service. Refer to the product packaging for India's toll-free customer service number.
• BOSCH BeConnected App: Utilize the BOSCH BeConnected App for extended warranty registration and to access additional rewards and resources.

Figure 6: Information regarding the Bosch BeConnected App for extended warranty and rewards.