1. Introduction
The Xiaomi Mijia Electric Grinding Pen is a versatile and portable tool designed for precision tasks such as carving, polishing, burnishing, and drilling. Featuring a powerful 22000r/min brushless motor and a slim, ergonomic design, it offers both corded and cordless operation for maximum flexibility. This manual provides essential information for the safe and effective use of your new electric grinding pen.
2. Package Contents
Please check the package contents upon unboxing to ensure all items are present:
- Mijia Electric Grinding Pen (x1)
- Storage Box (x1)
- Grinding Heads (x16)
- Charging Cable (x1)
- User Manual (x1)
The 16 high-quality grinding heads include:
- Wool brush
- Auger bit
- Emery grinding head
- Grinding wheel grinding head
- Rubber grinding head
- Wool grinding head
3. Key Features
- High-Performance Motor: Equipped with a durable brushless hollow cup motor, providing speeds up to 22000 r/min for efficient work.
- Dual-Mode Power: Supports both lithium battery (cordless) and plug-in (corded) operation.
- Long Battery Life: 800mAh lithium battery offers approximately 60 minutes of continuous use on a full charge.
- Ergonomic Design: Slim 2cm diameter pen-shaped body with a soft rubber grip for comfortable handling and an anti-roll design.
- Rich Accessories: Includes 16 high-quality grinding heads for various applications.
- Smart Storage: Automatic pop-up style storage box keeps accessories organized and easily accessible.
- Portable: Lightweight at approximately 310g, making it easy to carry and store.
4. Setup
4.1 Charging the Device
Before first use, or when the low power indicator flashes red, charge the grinding pen using the provided Type-C charging cable. It is recommended to use a 5V-3A charger for optimal charging. A full charge takes approximately 90 minutes.
4.2 Installing Grinding Heads
- Unscrew the pen head to access the chuck.
- Insert the desired grinding head into the chuck. The clamping size is 2.35mm.
- Tighten the pen head securely to ensure the accessory is firmly installed.
Important: Always ensure accessories are installed correctly and tightened before use to prevent accidents and damage to the device or workpiece.
5. Operating Instructions
5.1 Power On/Off and Speed Control
- Power On/Off: Press the power button once to turn the device on or off.
- Speed Adjustment: Rotate the knob at the end of the pen to adjust the speed. The initial cut-in speed is approximately 15000 r/min, and can be adjusted up to 22000 r/min.
5.2 Applications
The Mijia Electric Grinding Pen is suitable for a wide range of creative and precision tasks:
- Wood carving
- Wood art and iron art polishing
- Model polishing
- Pendant perforation
- Jade, silver, and other hand-piece polishing
6. Maintenance
- Cleaning: After each use, gently wipe the pen body with a soft, dry cloth. Remove any dust or debris from the chuck area.
- Accessory Care: Grinding heads are consumable products and will wear down over time. Replace them as needed for optimal performance. Clean grinding heads after use to prolong their lifespan.
- Storage: Store the grinding pen and its accessories in the provided storage box in a dry, cool place, away from direct sunlight and moisture.
- Battery Care: For long-term storage, ensure the battery is partially charged (around 50%) to maintain battery health. Avoid fully discharging the battery for extended periods.
7. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Device does not turn on. | Low battery or no charge. | Charge the device using the Type-C cable and a 5V-3A charger. |
| Red light is flashing. | Low battery reminder. | Plug in the device to charge. It can be used while charging. |
| Accessory is loose or falls out during operation. | Accessory not tightened properly. | Unscrew the pen head, re-insert the accessory, and tighten the pen head securely. |
| Reduced performance or poor grinding/polishing. | Worn-out grinding head. | Replace the grinding head with a new one. |
8. Specifications
| Product Name | Mijia Electric Grinding Pen |
| Product Size | Approx. 184 × 20 × 20.6mm |
| Net Weight | Approx. 310g |
| Cut-in Speed | 15000-22000 r/min |
| Battery Type | Lithium ion battery |
| Rated Capacity | 800mAh |
| Plug-in Use (Input) | 5V-3A |
| Charging Parameters | 5V-1A |
| Charging Interface | Type-C |
| Charging Duration | Approx. 90 minutes |
| Operating Temperature | 0°C ~ 40°C |
| Storage Temperature | -10°C ~ 45°C |
| Clamping Size | 2.35mm |
| Implementation Standards | GB/T 3883.1-2014 |
9. User Tips
- Start Slow: When beginning a new task, especially with delicate materials, start with a lower speed setting and gradually increase it as needed.
- Practice Makes Perfect: If you are new to using a grinding pen, practice on scrap materials first to get a feel for the tool and different grinding heads.
- Ventilation: Always work in a well-ventilated area, especially when grinding or carving materials that produce fine dust.
- Eye Protection: Wear appropriate eye protection to shield against flying debris.
10. Warranty and Support
For warranty information, technical support, or service inquiries, please refer to the official Xiaomi Mijia website or contact the retailer from whom you purchased the product. Keep your proof of purchase for any warranty claims.
