1. Important Safety Instructions
Always read and understand all safety warnings, instructions, illustrations, and specifications provided with this power tool. Failure to follow all instructions listed below may result in electric shock, fire, and/or serious injury.
General Power Tool Safety
- Work Area Safety: Keep your work area clean and well-lit. Cluttered or dark areas invite accidents.
- Electrical Safety: Power tool plugs must match the outlet. Never modify the plug. Avoid body contact with earthed or grounded surfaces.
- Personal Safety: Always wear eye protection, hearing protection, and suitable work gloves. Dress properly; avoid loose clothing or jewelry.
- Tool Use and Care: Do not force the power tool. Use the correct power tool for your application. Disconnect the plug from the power source before making any adjustments, changing accessories, or storing power tools.
Angle Grinder Specific Safety Warnings
- Protective Guard: Always use the protective guard provided with the tool. Ensure it is securely attached and positioned for maximum safety.
- Proper Disc Selection: Use only discs that are correctly rated for the grinder's speed and intended application (grinding, cutting).
- Auxiliary Handle: Always operate the tool with the auxiliary handle firmly attached and held with both hands.
- Kickback Control: Be aware of kickback, which is a sudden reaction to a pinched or snagged rotating wheel. Maintain a firm grip and proper body position.
- Spark Direction: Direct sparks away from yourself and other persons or flammable materials.
For a complete list of safety warnings and instructions, refer to the comprehensive safety manual included with your Bosch Professional GWS 12-125 S.
2. Product Overview
The Bosch Professional GWS 12-125 S is a compact yet powerful small angle grinder designed for efficient grinding and cutting tasks. It features a robust motor, ergonomic design, and safety features for professional use.
Image 2.1: Bosch Professional GWS 12-125 S Small Angle Grinder
Components
The package typically contains the following components:
Image 2.2: Included components of the Bosch GWS 12-125 S Angle Grinder
- GWS 12-125 S Small Angle Grinder (Main Unit)
- Two-hole Spanner
- Protective Guard
- Vibration Control Auxiliary Handle
- Locking Nut
- Backing Flange
3. Setup
Before operating the angle grinder, ensure all components are correctly assembled and secured.
3.1 Attaching the Auxiliary Handle
- Screw the auxiliary handle into one of the threaded holes on the gear head.
- Ensure it is tightened securely. The handle can be positioned on either side for left or right-handed operation.
3.2 Mounting the Protective Guard
- Place the protective guard onto the collar of the gear head.
- Adjust the guard to ensure it covers the disc adequately and protects the user from sparks and debris.
- Tighten the clamping screw on the guard firmly to prevent it from rotating during operation.
3.3 Installing the Grinding/Cutting Disc
- Ensure the tool is unplugged.
- Press the spindle lock button to secure the spindle.
- Place the backing flange onto the spindle.
- Position the selected grinding or cutting disc onto the backing flange, ensuring it sits flat.
- Screw the locking nut onto the spindle.
- Use the two-hole spanner to firmly tighten the locking nut. Release the spindle lock.
4. Operating Instructions
Follow these guidelines for safe and effective operation of your angle grinder.
4.1 Pre-Operation Checks
- Verify that the power cord and plug are undamaged.
- Confirm the disc is correctly installed and securely tightened.
- Check that the protective guard and auxiliary handle are properly attached.
- Ensure the workpiece is stable and securely clamped.
4.2 Switching On and Off
- Switching On: For continuous operation, push the ON/OFF switch forward and press it down until it locks.
- Switching Off: For continuous operation, press the rear part of the ON/OFF switch. For momentary operation, release the switch.
- The tool features a Soft Start function for smooth power-up and Restart Protection to prevent accidental startup after a power interruption.
4.3 Grinding and Cutting Techniques
Always hold the angle grinder firmly with both hands. Allow the disc to reach full speed before contacting the workpiece.
Image 4.1: Proper technique for cutting metal with the angle grinder
- Grinding: Apply moderate pressure and move the grinder evenly across the surface. Maintain an angle of approximately 15-30 degrees between the disc and the workpiece.
- Cutting: Use a cutting disc and apply light, consistent pressure. Do not tilt the cutting disc in the cut. Ensure the cutting line is clear and the workpiece is stable.
- The tool's KickBack control and overload protection enhance safety during operation.
Image 4.2: Demonstrating the grinder's performance in various applications
5. Maintenance
Regular maintenance ensures the longevity and optimal performance of your Bosch Professional GWS 12-125 S.
5.1 Cleaning
- Always unplug the tool before cleaning.
- Clean the ventilation slots regularly to prevent overheating. Use a soft brush or compressed air.
- Wipe the tool housing with a damp cloth. Do not use harsh chemicals or abrasive cleaners.
5.2 Inspection and Replacement
- Power Cord: Periodically inspect the power cord for any signs of damage. If damaged, have it replaced by a qualified service technician.
- Carbon Brushes: The motor is equipped with carbon brushes. If excessive sparking is observed, the carbon brushes may need replacement. This should be performed by an authorized service center.
- Discs: Replace worn or damaged grinding/cutting discs immediately. Ensure new discs are compatible with the tool's specifications.
5.3 Storage
- Store the angle grinder in a dry, secure location, out of reach of children.
- Protect the tool from dust and moisture.
6. Troubleshooting
This section addresses common issues you might encounter with your angle grinder.
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start | No power supply; Damaged power cord/plug; ON/OFF switch faulty; Restart Protection activated | Check power outlet; Inspect cord/plug (replace if damaged); Contact service center; Disconnect and reconnect power. |
| Excessive vibration | Damaged or unbalanced disc; Loose locking nut; Worn bearings | Replace disc; Tighten locking nut; Contact service center. |
| Tool overheats | Blocked ventilation slots; Overloading the tool; Worn carbon brushes | Clean ventilation slots; Reduce load; Contact service center for brush inspection. |
| Poor grinding/cutting performance | Worn or incorrect disc; Insufficient pressure | Replace disc with a new, appropriate one; Apply consistent, moderate pressure. |
If you encounter issues not listed here or if the suggested solutions do not resolve the problem, please contact Bosch customer service.
7. Specifications
Technical data for the Bosch Professional GWS 12-125 S Small Angle Grinder.
Image 7.1: Technical Data Overview
| Specification | Value |
|---|---|
| Brand | Bosch |
| Model Number | GWS 12-125 S |
| Rated Input Power | 1200 Watts |
| No-Load Speed | 11000 RPM |
| Disc Diameter | 125 mm |
| Grinding Spindle Thread | M14 |
| Voltage | 230 Volts (AC) |
| Item Weight | 3 Kilograms |
| Product Dimensions | 36L x 12W x 10.8H Centimeters |
| Material | Metal |
| Power Source | Corded Electric |
| Included Components | 1 x GWS 12-125 S Small Angle Grinder |
8. Warranty and Support
Bosch Professional products are manufactured to high-quality standards. For warranty information, please refer to the warranty card included with your product or visit the official Bosch website.
Customer Service
For any queries, technical assistance, or service requests, please contact Bosch Customer Service:
- Toll-free Number: 1800-425-8665
- Manufacturer: Robert Bosch Power Tools GmbH
Please have your product model number (GWS 12-125 S) and purchase details ready when contacting support.
