Master CNC Attacks: Verified Perfect Threading Tips
In CNC machining, attack (creating precise internal threads) is a seemingly simple process with high bets. A single mistake can lead to broken tools, scrapped parts or compromised thread integrity. At Greatlight, as an expert in high-precision five-axis CNC machining, we have perfected attack operations across aerospace, medical and automotive applications. Let’s dig into actionable programming techniques to improve your attack results.
1. Material matters: Click to select basic knowledge
Never consider faucets as universal faucets. The faucets that optimize aluminum will decompose in titanium. consider:
- Material hardness: Hardened steel (>45 hrc) and cobalt HSS were used for softer alloys.
- Chip formation: Select a spiral faucet (withdraw the chip upward) or a spiral point faucet for the blind hole to make the entire hole.
- coating: Tin or ticn coatings reduce friction in viscous materials such as stainless steel.
Expert insights: For Exotics like Inconel, a tap with sharp tips and high core rigidity is preferred to combat hardening of work.
2. Speed and Feed: Golden Ratio
Improper speed/feeding can cause 70% knock failure. Follow the following rules:
- Calculate RPM:
rpm = (cutting speed SFM × 3.82) / Tap Digumeter
Example: 1/4 of 60 SFM"-20 Click →rpm≈917.
- The feed must match the thread pitch:
Feed rate (IPM) = rpm × pitch
Use synchronized rigid strikes (G84/G74) to perform this function.
Key Notes: Blind holes or hard materials reduce the speed by 20-30% to avoid chip packaging.
3. Pecking: Your safety net
For holes deeper than 1.5×Tap diameter, the Peck cycle (G84/G74 with Q) prevents chip clogging:
GCODE
G84 X0 Y0 Z-0.75 R0.1 Q0.15 F25. ; (q = inch wall pecking depth)
Best Practices:
- Set the Q value to 1×TAP diameter.
- Retract completely every time you peck to clear the chip.
- Add 0.5 seconds stay at the bottom of the hole (G4 P500).
4. Coolant Strategy: Beyond the Basics
Coolant is not optional – here is the lifeline of your faucet:
- use Pass coolant Efficiently rinse the chip for holes deeper than 3× diameter.
- For aluminum, emulsified oils can prevent the material from sticking.
- In titanium, high-pressure coolant (over 1,000 PSIs) inhibits heat-induced tool wear.
5. Hole preparation: No signature pre-shot steps
A perfect hole ensures long life of upgrades:
- Drill holes to 85-90% of the diameter of the small line (e.g., 3.2mm drilling of M4×0.7 line).
- Vertical alignment of spot entry points – even 0.5° misalignment risk rupture.
- Pre-click the hole to avoid clicking deflection.
6. Rigid strike and tension compression holder
- Strict knocking: The machine spindle rotates synchronously/z-axis. Great for shallow holes and high precision. A rigid setting is required.
- Tension compression holder: Absorb axial forces in a non-synchronous machine. Used for different material density or flexible settings.
7. Bottom residents: Small pause, big reward
Add 0.2–0.5 seconds stay at the bottom of the hole (G4 P200):
- Ensure full thread form.
- Allow the remaining chips to pop up.
- prevention "Fake torque" During the reversal.
8. Thread milling: When attack is not feasible
For solid materials or oversized lines, thread milling (G02/G03 helical interpolation) is good at:
- One tool handles multiple thread sizes/pitches.
- No kick breaks in the steel.
- Excellent finish in blind holes.
example:
G02 X0 Y0 Z-0.6 I-0.1 J0 F30.
9. Click Monitoring and Maintenance
- Use machine counters to track click life. Replace the faucet at 50-70% of the average life span.
- Check the flute, edge rounding or discoloring chip.
- Use the tool decorating station to check for diameter wear.
10. Verification: measure twice, click once
- Always run the test piece. Verify threads in the following way
- Go/disable the instrument.
- Pitch/size thread inspector.
- Surface Roughness Tester (RA ≤3.2µm for critical applications).
in conclusion
Mining is a mixture of precise programming, materials science and tool mastery. By optimizing these variables, you can cut waste rates and increase throughput – especially important in complex five-axis jobs, such as our aerospace impellers or medical implants. At Greatlight, we paired the Advanced DMG MORI five-axis center with sensor aid monitoring to achieve near-zero TAP failures. Whether you are prototyping or scaling production, smart attacks ensure that your threads are under pressure. Explore our precise machining services today to provide the perfect parts needed.
FAQ: CNC strike stands out
Q: Can I click without coolant?
A: Only in non-critical soft materials (such as plastics). In metals, coolant extends faucet life by 2–3 times and prevents damaging. Dry strike risk can lead to thermal fractures.
Q: How to calculate the knock speed of titanium?
A: Keep SFM at 10–20: rpm = (15×3.82) / TAP diameter. Always start conservatively.
Q: What is the reason for the first place in the tap break?
Answer: Chip evacuation fault – the official in the blind hole. Use Peck cycle and high pressure coolant.
Q: Rigid and tension compression attacks – better?
A: Rigidity provides higher accuracy; tension compression is suitable for old machines. For Greatlight’s five-axis system, the preferred rigid strike is accurate.
Q: When should I use thread milling on mining?
A: For holes larger than M12, hardened material (>50 hrc) or faucet align with tricky asymmetric parts.
Q: How often should I replace the faucet?
Answer: After 50-200 holes (changes with the material). Monitoring torque – Speeds above 20% indicate wear.
Q: Why do threads peel off after processing?
A: Possible pilot hole mismatch. Double check drill size and TAP specifications. For M6×1, the hole should be 5.0mm (±0.03mm).
Are there any more questions? Greatlight’s engineering team is ready to solve your toughest attack challenges. Contact us for a free processing consultation.
