1. Introduction
The HH-G02 Portable Pneumatic Engraver is a versatile tool designed for precision engraving and polishing tasks on various materials such as jewelry, metal, and stone. Featuring a powerful motor and adjustable settings, it offers efficient and detailed work for both professional jewelers and DIY enthusiasts. This manual provides essential information for the safe and effective use of your engraving machine.

2. Safety Information
Please read and understand all safety instructions before operating the HH-G02 Pneumatic Engraver. Failure to follow these instructions may result in electric shock, fire, or serious injury.
General Safety
- Always wear appropriate personal protective equipment (PPE), including safety glasses, gloves, and hearing protection.
- Ensure your work area is clean, well-lit, and free from clutter.
- Keep children and bystanders away from the operating machine.
- Do not operate the machine in damp or wet conditions.
- Avoid operating the machine while fatigued or under the influence of drugs or alcohol.
Electrical Safety
- Ensure the power supply matches the specifications of the machine (220V 50Hz or 110V 60Hz).
- Do not use the machine with a damaged power cord or plug.
- Always unplug the machine before performing any maintenance or adjustments.
Air Pressure Safety
- A compressor is required for operation. Ensure the compressor is properly maintained and capable of providing the necessary air pressure.
- Do not exceed the maximum recommended air pressure of 45 PSI.
- Always release air pressure from the system before disconnecting hoses or performing maintenance.
- Check all air connections for leaks before operation.
3. Package Contents
Verify that all items are present in your package:

- HH-G02 Engraving Machine Unit
- Pneumatic Tube (x1)
- Handpiece (x1)
- Foot Pedal (x1)
- Power Converter (x1)
- Power Cord (x1)
- Allen Wrench (x3)
- Filter (x1)
- User Manual (x1)
4. Product Overview
Familiarize yourself with the components and controls of your HH-G02 Engraver.

Main Unit Controls:
- Power Switch: Turns the machine ON/OFF.
- SPM Dial (Handpiece Working Speed): Adjusts the engraving speed from 400-8000 RPM.
- Air Pressure Adjustment Knob: Controls the air pressure from 0-45 PSI. Pull out to adjust, push in to lock.
- Precision Pressure Gauge: Displays the current air pressure.
- Handle Quick Connection Ports: For connecting the handpiece.
Rear Connections:
- Air Input: Connects to your external air compressor.
- Throttle Connection: Connects to the foot pedal.
- Filter Connector: For attaching the included air filter.
- Power Connection: For the power adapter.


5. Setup Instructions
Follow these steps to set up your HH-G02 Engraver for first use. An external air compressor (not included) is required.
- Install the Filter: Attach the provided filter to the designated filter connector at the back of the main unit. Secure it with the appropriate Allen wrench.
- Connect Pneumatic Tubes:
a. Connect one end of the clear pneumatic tube to the filter's output and the other end to the 'Air Input' port on the main unit.
b. Connect the orange pneumatic tube (or similar) from your external air compressor to the filter's input.
c. Connect the clear pneumatic tube from the foot pedal to the 'Throttle Connection' port on the main unit. - Connect Power: Plug the power cord into the power converter, then connect the converter to the 'Power Connection' port on the main unit. Plug the power cord into a suitable electrical outlet.
- Connect Handpiece: Attach the handpiece's pneumatic tube to one of the 'Handle Quick Connection Ports' on the front of the main unit.
- Insert Engraving Tool: Use an Allen wrench to loosen the chuck on the handpiece, insert your desired engraving tool, and then tighten the chuck securely.

6. Operating Instructions
- Power On: Press the power switch on the main unit. The indicator light will illuminate.
- Adjust Air Pressure: Pull out the 'Air Pressure Adjustment Knob' and rotate it to set the desired pressure, observing the 'Precision Pressure Gauge'. Once set, push the knob back in to lock it.
- Adjust Handpiece Speed: Rotate the 'SPM Dial' to set the desired handpiece working speed.
- Begin Engraving: Place the material to be engraved on a stable surface. Hold the handpiece firmly and press the foot pedal to activate the engraving action. The foot pedal allows for precise control over cutting speed and depth.
- Practice: It is recommended to practice on scrap materials to get a feel for the machine's settings and your desired engraving effect before working on your final piece.

Applications:
The HH-G02 is suitable for a wide range of applications:
- Gemstone Setting
- Jewelry Finishing
- Metal Engraving
- Stone Engraving
- Micro Mosaic
- Milgram
- Crafting intricate designs on artwork
- Smoothing stone surfaces
- Polishing gold and silver jewelry


7. Maintenance
- Filter Cleaning: Regularly check and clean the air filter to prevent impurities from affecting the machine's speed and performance. A clogged filter can reduce air flow and engraving efficiency.
- Tool Care: Keep engraving tools clean and sharp for optimal performance. Replace dull or damaged tools promptly.
- General Cleaning: Wipe down the machine with a soft, dry cloth after each use to remove dust and debris. Do not use harsh chemicals or abrasive cleaners.
- Storage: Store the machine in a clean, dry environment when not in use.
8. Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Machine does not turn on | No power supply; Damaged power cord/adapter | Check power connection and outlet; Inspect power cord/adapter for damage. |
| No engraving action/weak impact | No air supply; Low air pressure; Clogged filter; Loose pneumatic connections; Faulty foot pedal/handpiece | Ensure air compressor is on and connected; Adjust air pressure knob; Clean/replace filter; Check all tube connections; Test foot pedal/handpiece. |
| Inconsistent engraving results | Incorrect pressure/speed settings; Dull/damaged engraving tool; Material not secured | Adjust air pressure and SPM dial; Replace engraving tool; Secure workpiece firmly. |
| Excessive noise/vibration | Loose components; Damaged internal parts | Inspect for loose parts and tighten; If problem persists, contact support. |
9. Specifications
| Feature | Specification |
|---|---|
| Model Number | HH-G02 (ENJC0037) |
| Item Type | Jewelry making engraving tools & equipments |
| Product Features | High Efficiency |
| Power Supply | 220V 50Hz / 110V 60Hz |
| Handpiece Working Speed | 400-8000 RPM |
| Range of Pressure Regulation | 0-45 PSI |
| Dimension (L x W x H) | 27 x 14 x 22.5 CM (10.63 x 5.51 x 8.86 inches) |
| Body Material | Reinforced ABS + Steel Frame |
| Weight (Shipping) | 7 KG |
| High-concerned chemical | None |
10. Warranty and Support
This product is covered by a standard manufacturer's warranty against defects in materials and workmanship. For warranty claims, technical support, or service inquiries, please contact your retailer or the manufacturer directly. Keep your purchase receipt as proof of purchase.





