1. Introduction
The OBI 135W 3200 RPM Rotary Tool is a versatile power tool designed for a wide range of precision applications. Its compact size and variable speed control make it ideal for tasks such as drilling, grinding, polishing, sanding, cutting, and carving on various materials. This manual provides essential information for the safe and effective operation, maintenance, and troubleshooting of your rotary tool.
2. Safety Instructions
Always adhere to basic safety precautions when using electrical tools to reduce the risk of fire, electric shock, and personal injury.
- Personal Protective Equipment (PPE): Always wear safety glasses, hearing protection, and appropriate gloves. A dust mask is recommended for dusty operations.
- Work Area: Keep your work area clean, well-lit, and free from clutter. Do not operate the tool in explosive atmospheres, such as in the presence of flammable liquids, gases, or dust.
- Electrical Safety: Ensure the power cord is in good condition and avoid using the tool in wet or damp conditions. Never pull the cord to disconnect from the outlet.
- Tool Handling: Always unplug the tool from the power source before changing accessories, making adjustments, or performing maintenance. Secure the workpiece firmly.
- Children and Bystanders: Keep children and bystanders away while operating the tool.
- Ventilation: Do not block the ventilation openings on the tool.
3. Package Contents
Carefully unpack your OBI Rotary Tool and verify that all items are present and undamaged. If any items are missing or damaged, contact your retailer.
- OBI 135W 3200 RPM Rotary Tool
- Flexible Shaft Attachment
- Accessory Kit (approx. 40 pieces, including various grinding stones, sanding bands, cutting discs, drills, collets, and a wrench)
- Storage Case


4. Product Overview
Familiarize yourself with the components of your rotary tool before operation.

Key Components:
- Power Switch: On/Off control for the tool.
- Variable Speed Dial: Adjusts the rotational speed of the tool.
- Collet Nut: Secures accessories in place.
- Spindle Lock Button: Used to lock the spindle for easy accessory changes.
- Ventilation Slots: Ensure proper airflow to prevent overheating.
- Flexible Shaft Connection Point: Where the flexible shaft is attached for precision work.
5. Setup
Proper setup ensures safe and efficient operation.
5.1 Attaching Accessories
- Unplug the tool from the power source.
- Press and hold the spindle lock button.
- Unscrew the collet nut.
- Insert the desired accessory shank fully into the collet.
- Tighten the collet nut securely with the provided wrench. Do not overtighten.
5.2 Attaching the Flexible Shaft
- Unplug the tool from the power source.
- Unscrew and remove the collet nut and collet from the main tool.
- Insert the inner drive shaft of the flexible shaft into the tool's spindle.
- Thread the flexible shaft's coupling nut onto the tool's housing until secure.
- Insert the desired accessory into the collet at the end of the flexible shaft and tighten with the flexible shaft's wrench.


6. Operation
Follow these steps for safe and effective use of your rotary tool.
- Select Accessory: Choose the appropriate accessory for your task and install it securely.
- Adjust Speed: Plug the tool into a power outlet. Turn the variable speed dial to the desired RPM. Start with a lower speed for delicate work or when learning, and increase as needed. The maximum speed is 3200 RPM.
- Power On: Flip the power switch to the 'ON' position.
- Begin Work: Apply light, consistent pressure. Let the tool do the work. Avoid excessive force, which can cause the tool to stall or damage the accessory/workpiece.
- Power Off: When finished, flip the power switch to the 'OFF' position and unplug the tool.
Tips for Specific Applications:
- Drilling: Use appropriate drill bits. Start with a pilot hole if necessary.
- Grinding/Sanding: Move the tool continuously to avoid creating grooves or burning the material.
- Polishing: Use polishing accessories with appropriate polishing compound.
- Cutting: Use cutting discs for thin materials. Ensure the workpiece is stable.
7. Maintenance
Regular maintenance will prolong the life of your tool and ensure optimal performance.
- Cleaning: After each use, unplug the tool and clean the exterior with a soft, damp cloth. Use a brush or compressed air to clear dust from the ventilation slots.
- Accessory Inspection: Regularly inspect accessories for wear or damage. Replace worn or damaged accessories immediately.
- Cord Inspection: Check the power cord for any cuts, fraying, or damage. Do not use the tool if the cord is damaged.
- Storage: Store the tool and its accessories in the provided case, in a dry, secure location out of reach of children.
8. Troubleshooting
If you encounter issues with your rotary tool, refer to the following common problems and solutions.
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start. | No power supply; Power switch off; Damaged cord. | Check power outlet; Ensure switch is ON; Inspect and replace damaged cord. |
| Excessive vibration. | Accessory not properly seated or bent; Worn accessory. | Re-seat accessory; Replace accessory. |
| Tool overheats. | Blocked ventilation slots; Excessive load. | Clean ventilation slots; Reduce pressure on the tool; Allow tool to cool. |
| Accessory slips in collet. | Collet nut not tight enough; Incorrect collet size. | Tighten collet nut securely; Ensure correct collet size for accessory shank. |
If the problem persists after attempting these solutions, please contact customer support.
9. Specifications
| Feature | Specification |
|---|---|
| Brand | OBI |
| Model | 135W 3200 RPM Rotary Tool |
| Power Input | 135 Watts |
| Maximum Rotational Speed | 3200 RPM |
| Maximum Chuck Size | 3.2 Millimeters |
| Special Feature | Variable Speed |
| Product Weight | 1.39 Kilograms |
| Package Dimensions | 30 x 17.6 x 8.8 cm |
| Power Source | Corded Electric |
| Included Components | Drill Accessory (referring to the accessory kit) |
10. Warranty and Support
For specific warranty details and customer support, please refer to the documentation included with your purchase or contact OBI customer service directly. Warranty terms may vary based on region and retailer. Keep your purchase receipt as proof of purchase.





