If you're using a PwnCNC system with an ATC (Automatic Tool Changer) spindle, air solenoids, or any pneumatic accessories, it's critical to follow safe and proper air supply practices. Compressed air is powerful, and when misused or misconfigured, it can lead to performance issues or damage to components.
This guide outlines the air supply requirements, safety tips, and best practices to protect your CNC system and yourself.
✅ Basic Requirements for CNC Air Supply
To ensure reliable and safe operation of your ATC and pneumatic accessories, your air source should meet the following requirements:
| Parameter | Recommended |
|---|---|
| Air Pressure | 80–100 PSI (5.5–6.9 bar) |
| Air Flow | Minimum 90–100 L/min (3.5+ CFM) |
| Filtration | Inline water/oil filter recommended |
| Regulator | Inline pressure regulator recommended |
| Tank Size | At least 3 gallons for small compressors; 10+ gallons preferred |
⚠️ Do NOT exceed 115 PSI, as it may damage solenoids, air fittings, or ATC internals.
🛠️ Best Practices for Safety & Longevity
1. Use Clean, Dry Air
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Always run your compressor output through a filter-regulator-lubricator (FRL) or, at minimum, a water separator filter.
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Moisture or oil in the air line can:
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Cause internal corrosion
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Damage sensors or solenoids
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Lead to sticky tool changes
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2. Add a Pressure Regulator
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Set your regulator to 95 PSI, which is the optimal operating pressure for most ATC cylinders.
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Install the regulator as close to the machine as possible, after the filter.
3. Drain Your Compressor Tank Regularly
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Even with a filter, excess moisture buildup can enter the line.
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Drain manually every few days or use an automatic tank drain if available.
4. Power Off When Not in Use
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Disconnect or depressurize the air supply if the machine is idle for long periods.
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This reduces wear on solenoids and seals, and improves safety.
🔧 What Happens If Air Supply Is Improper?
| Symptom | Possible Cause |
|---|---|
| ATC fails to clamp/unclamp reliably | Low or inconsistent air pressure |
| Popping or hissing from solenoids | Moisture in the lines or overpressure |
| Toolchanger won’t activate | No air supply detected, pressure too low |
| Excessive air hiss when idle | Leaking fittings or stuck solenoid valve |
If you’re seeing any of the above, inspect your air filter, regulator, and connections before replacing components.
🧰 Installation Tips
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Use 1/4" or 3/8" OD polyurethane or nylon air tubing
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Make sure all push-to-connect fittings are fully inserted and leak-free
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Avoid tight bends or kinks in the tubing
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Install a shutoff valve near your pneumatics enclosure for quick disconnection
⚠️ Safety Notice:
Always disconnect power and air supply before servicing. Follow all safety precautions. PwnCNC products are intended for skilled users building or operating hobbyist to light industrial CNC systems.
💬 Still Need Help?
If you're unsure whether your compressor setup is compatible or you're troubleshooting ATC issues, contact our support team →. We’ll walk you through your air system step by step.
