Machining Titanium: Save Your Tools

Cutting titanium requires a careful approach compared to aluminum or steel. The key is managing heat because titanium retains it near the cutting edge. Use low cutting speeds, typically 30-50 surface feet per minute, and a generous flow of coolant to keep temperatures down. This prevents work hardening and extends tool life.

Tool geometry matters. Choose sharp, positive rake inserts with a polished surface to reduce friction. Avoid negative rake geometries that increase cutting forces. Coatings like AlTiN or TiAlN help handle the high heat, but even uncoated carbide can work if speeds are slow enough.

Always maintain rigid setups. Titanium can cause chatter, which accelerates tool wear. Use short tool overhangs and secure workpieces firmly. Climb milling is preferred over conventional milling to reduce heat buildup at the exit. Keep your machine's spindle in good condition to avoid vibration.

For drilling, peck cycles are essential to break chips and allow coolant to reach the cutting zone. Use high-pressure coolant through the tool if possible. Feeds should be moderate, not too light, to avoid rubbing that work hardens the surface. Consistent chip formation is a good sign.

With these practices, titanium becomes manageable without destroying cutters. Start conservatively and adjust based on tool wear and surface finish. Patience and proper technique make all the difference.

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