Introduction
The Astro Pneumatic Tool Model 218 is a high-speed 1/8-inch pencil type die grinder designed for precision work in confined spaces. This lightweight pneumatic tool offers a free speed of 56,000 RPM and features a twist-action variable speed control for optimal performance across various applications. It is ideal for tasks such as cleaning dies, rotors, backing plates, brake pads, mounts, and for high-speed porting and finishing of small parts.
Safety Information
WARNING: Read and understand all safety warnings and instructions before operating this tool. Failure to follow the warnings and instructions may result in electric shock, fire, and/or serious injury.
- Always wear appropriate personal protective equipment, including eye protection (safety glasses or goggles), hearing protection, and gloves.
- Ensure the workpiece is securely clamped before beginning any operation.
- Disconnect the air supply before changing accessories, performing maintenance, or when the tool is not in use.
- Do not exceed the maximum operating pressure of 90-120 PSI.
- Keep hands and loose clothing away from rotating parts.
- Use only accessories rated for the tool's maximum RPM.
- Maintain a clean and well-lit work area.
- Never point the tool at yourself or others.
- Ensure the air hose is free from kinks and damage.
Package Contents
Verify that all items are present upon unpacking:
- Astro Pneumatic Tool 218 1/8" Pencil Type Die Grinder
- Air Hose (5-foot guarded hose)
- Wrenches for collet changes
Setup
- Air Supply Connection:
Connect the supplied 5-foot guarded air hose to the tool's 1/4-inch NPT air inlet. Ensure a secure, leak-free connection. Connect the other end of the hose to your air compressor's quick-connect coupler. The air compressor should be capable of supplying 90-120 PSI and an average air consumption of 4 CFM.
Figure 1: Air hose connection point. - Lubrication:
Before initial use and daily thereafter, apply a few drops of pneumatic tool oil into the air inlet. This ensures proper internal lubrication and extends tool life.
- Accessory Installation:
Insert the desired 1/8-inch shank grinding or polishing accessory into the collet. Use the provided wrenches to securely tighten the collet, ensuring the accessory is firmly held. Do not overtighten.
Figure 2: The Astro Pneumatic Tool 218 Pencil Type Die Grinder. 
Figure 3: Wrenches for collet adjustment.
Operating Instructions
- Starting the Tool:
With the air supply connected and accessory installed, hold the tool firmly. The tool features a twist-action variable speed control. Twist the control to initiate air flow and adjust the speed. Start at a lower speed and gradually increase as needed for the task.
- Speed Control:
The twist throttle allows for precise control over the tool's 56,000 RPM free speed. Adjust the speed to match the material and the specific grinding, cleaning, or polishing application. Higher speeds are generally used for fine finishing, while lower speeds may be suitable for more delicate work.
- Application:
Apply light, consistent pressure to the workpiece. Allow the tool's speed to do the work. Avoid excessive force, which can bog down the motor, damage the accessory, or cause loss of control. Move the tool smoothly across the surface for even material removal or polishing.
- Stopping the Tool:
Release the twist-action control to stop the tool. Disconnect the air supply when finished or when leaving the tool unattended.
Maintenance
- Daily Lubrication: Apply a few drops of pneumatic tool oil into the air inlet before each use. This is crucial for the longevity and performance of the tool.
- Air Supply Quality: Ensure your air compressor system includes an air filter to prevent moisture and debris from entering the tool, which can cause premature wear.
- Cleaning: Keep the tool clean and free of debris. Wipe down the exterior with a clean cloth. Do not use harsh solvents that could damage the tool's finish or internal components.
- Collet Inspection: Regularly inspect the collet for wear or damage. A worn collet can lead to poor accessory retention and vibration. Replace if necessary.
- Storage: Store the tool in a dry, clean environment when not in use.
Troubleshooting
| Problem | Possible Cause | Solution |
|---|---|---|
| Tool does not start or runs slowly | Low air pressure; Insufficient lubrication; Clogged air inlet; Damaged internal components | Check air compressor pressure (90-120 PSI); Add pneumatic tool oil; Clean air inlet; Contact service for repair. |
| Excessive vibration | Worn or damaged accessory; Loose collet; Bent accessory shank; Internal wear | Replace accessory; Tighten collet; Use only straight-shank accessories; Contact service for inspection. |
| Air leaks | Loose fittings; Damaged O-rings or seals | Tighten all connections; Inspect and replace O-rings/seals as needed. |
| Reduced power | Low air pressure; Insufficient lubrication; Worn motor vanes | Verify adequate air pressure; Lubricate tool; Contact service for internal component replacement. |
Specifications
| Feature | Specification |
|---|---|
| Model Number | 218 |
| Collet Size | 1/8-inch |
| Free Speed | 56,000 RPM |
| Overall Length | 5-1/4 inches (133mm) |
| Net Weight | 1/4-pound (0.11kg) |
| Air Inlet Thread NPT | 1/4-inch |
| Air Hose I.D. Size | 3/8-inch (10mm) |
| Average Air Consumption | 4 CFM |
| Noise Level | 73-75 dB |
| Vibration Level | 0.07 m/s² |
| Air Pressure | 90-120 PSI |
| Hose Length | 5-Feet |
| Power Source | Pneumatic-powered |
| Recommended Uses | Cleaning, Grinding, Polishing |
Warranty and Support
This Astro Pneumatic Tool product is covered by a Manufacturer Warranty. For specific details regarding warranty coverage, duration, and claims procedures, please refer to the documentation included with your purchase or visit the official Astro Pneumatic website.
For technical support, parts, or service inquiries, please contact Astro Pneumatic customer service. You can also visit the Astro Pneumatic Store on Amazon for additional product information and resources.