1. Introduction
The ENGINDOT Rotary Tool Kit, model RTD35ACL, is a versatile power tool designed for a wide range of precision tasks. With its variable speed control and numerous accessories, it is suitable for applications such as cutting, engraving, drilling, sanding, polishing, and grinding. This manual provides essential information for safe and effective operation, setup, maintenance, and troubleshooting.

Figure 1.1: The ENGINDOT Rotary Tool Kit and its included accessories.
2. Safety Information
Always prioritize safety when operating power tools. Read and understand all instructions before use. Keep this manual for future reference.
- Eye Protection: Always wear safety glasses or goggles to protect your eyes from flying debris.
- Hand Protection: Wear appropriate gloves to protect your hands.
- Work Area: Ensure your work area is clean, well-lit, and free from obstructions.
- Secure Workpiece: Always secure the workpiece firmly to prevent movement during operation.
- Ventilation: Work in a well-ventilated area, especially when generating dust or fumes.
- Unplug When Changing Accessories: Always unplug the tool from the power source before changing accessories or performing maintenance.
- Proper Speed: Select the correct speed for the accessory and material being worked on.
- Avoid Overloading: Do not force the tool; let the tool and accessory do the work.
- Keep Children Away: Do not allow children or untrained individuals to operate the tool.
3. Package Contents
Your ENGINDOT Rotary Tool Kit includes the following items:

Figure 3.1: Detailed view of all accessories included in the kit.
- 1 x Rotary Tool
- 1 x Tool Box
- 1 x Accessory Case
- 1 x Transparent Shield
- 1 x Flexible Shaft
- 1 x Keyless Chuck
- 1 x Drilling Guide
- 25 x Fiberglass Cutting Off Wheels
- 1 x Drill Bit
- 5 x Mesh Cutting Discs
- 2 x Mandrels
- 3 x HSS Drills
- 14 x Sanding Bands
- 1 x Sanding Shank
- 30 x Sanding Papers
- 1 x Spanner
- 1 x Allen Wrench
- 1 x Collet (φ3.2mm)
- 3 x Diamond Grinding Needles
- 1 x Engraving Cutter
- 8 x Grinding Wheels with Shanks
- 4 x Felt Wheels
- 1 x Mandrel (for felt wheels)
- 1 x Steel Brush
4. Product Overview
The ENGINDOT Rotary Tool features a robust design with user-friendly controls and versatile attachments.

Figure 4.1: Main components of the rotary tool.
Key Features:
- Quick-change Keyless Chuck: Allows for fast and easy accessory changes without needing a collet wrench. It accommodates attachments from 1/8'' to 1/32''.
- 6 Variable Speed Adjustment: Control the rotational speed from 10,000 RPM to 32,000 RPM, enabling precise work on various materials and tasks.
- Ergonomic Design: Lightweight and features a rubber handle for comfortable extended use.
5. Setup and Accessory Installation
Proper installation of accessories is crucial for safe and effective operation. Always ensure the tool is unplugged before changing any accessories.
5.1. Installing the Keyless Chuck
The keyless chuck allows for quick changes of various bits. Simply twist the chuck to open or close the jaws around the accessory shank.

Figure 5.1: The keyless chuck for easy accessory changes.
5.2. Installing a Sanding Band
- Unplug the rotary tool.
- Select the appropriate sanding band and sanding shank.
- Slide the sanding band onto the rubber drum of the sanding shank.
- Insert the sanding shank into the keyless chuck and tighten securely.
5.3. Installing a Cutting Disc and Protective Shield
- Unplug the rotary tool.
- Attach the desired cutting disc to a mandrel.
- Install the protective shield onto the tool's head, ensuring it is securely fastened.
- Insert the mandrel with the cutting disc into the keyless chuck and tighten.

Figure 5.2: The protective cover provides safety during cutting and grinding.
5.4. Installing the Cutting Guide
- Unplug the rotary tool.
- Attach the cutting guide to the tool's head.
- Adjust the depth of the cutting guide as needed for your application.
- Insert the appropriate cutting or drilling bit into the keyless chuck and tighten.

Figure 5.3: The cutting guide assists in precise cuts and drilling.
5.5. Installing the Flexible Shaft
The flexible shaft provides enhanced maneuverability for detailed work.
- Unplug the rotary tool.
- Unscrew the collet nut and remove the collet from the rotary tool.
- Insert the drive shaft of the flexible shaft into the collet opening of the rotary tool.
- Secure the flexible shaft by tightening the collet nut onto the tool.
- Insert the desired accessory into the chuck of the flexible shaft and tighten.

Figure 5.4: The flexible shaft allows for precise control in detailed tasks.
6. Operation
Once accessories are installed, you can begin using your rotary tool for various applications. Always ensure the workpiece is stable and you are wearing appropriate safety gear.
6.1. General Usage Steps
- Select the appropriate accessory for your task.
- Install the accessory and any necessary attachments (e.g., protective shield, cutting guide, flexible shaft).
- Plug in the rotary tool.
- Turn on the tool using the On/Off switch.
- Adjust the speed using the variable speed dial to match the material and task. Start with a lower speed and increase as needed.
- Apply gentle pressure and let the tool do the work. Avoid excessive force.
- After use, turn off the tool and unplug it before removing accessories.
6.2. Application Examples
- Sanding: Use sanding bands or discs to smooth rough edges or surfaces.
- Carving/Engraving: Utilize diamond grinding needles or engraving cutters for detailed work on wood, metal, or glass.
- Cutting: Employ cutting discs for precise cuts on various materials. Always use the protective shield.
- Drilling: Use drill bits for small holes. The drilling guide can assist in maintaining accuracy.
- Polishing/Cleaning: Attach felt wheels or steel brushes with polishing compound to shine surfaces or remove rust.
7. Maintenance
Regular maintenance ensures the longevity and optimal performance of your rotary tool.
- Cleaning: After each use, clean the tool and accessories to remove dust and debris. Use a soft cloth; do not use harsh chemicals.
- Brush Replacement: The motor brushes may need replacement over time. Refer to the exploded view diagram (Figure 4.1) for the location of the replaceable motor brush caps.
- Storage: Store the tool and accessories in their original carrying case in a dry, secure location away from children.
- Cord Inspection: Regularly inspect the power cord for any damage. Do not use the tool if the cord is damaged.
8. Troubleshooting
If you encounter issues with your rotary tool, refer to the following common troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not turn on | No power supply, faulty switch, worn motor brushes | Check power connection, ensure switch is ON, inspect/replace motor brushes. |
| Excessive vibration | Bent accessory shank, improperly installed accessory | Replace bent accessory, re-install accessory securely in chuck. |
| Tool overheats | Overloading, blocked ventilation slots | Reduce pressure, clear ventilation slots, allow tool to cool. |
| Reduced performance | Worn accessory, worn motor brushes | Replace accessory, inspect/replace motor brushes. |
9. Specifications

Figure 9.1: Technical specifications of the ENGINDOT Rotary Tool.
| Specification | Detail |
|---|---|
| Brand | ENGINDOT |
| Model Number | RTD35ACL |
| Power Source | Corded Electric |
| Voltage | 120 Volts |
| Wattage | 135 Watts |
| Maximum Rotational Speed | 32000 RPM |
| Variable Speed | 6-step adjustment (10,000 - 32,000 RPM) |
| Product Dimensions | 23.5 x 6 x 5 cm |
| Item Weight | 1.83 kg |
| Material | Rubber (handle) |
| Special Feature | Portable |
| Recommended Uses | Cutting, Engraving, Drilling, Sanding, Polishing, Grinding |
10. Warranty and Support
ENGINDOT products are manufactured to high-quality standards. For warranty information, technical support, or service inquiries, please refer to the contact information provided with your product packaging or visit the official ENGINDOT website. Please retain your proof of purchase for warranty claims.