Machining Titanium: Key Points That Protect Your Tools and Your Parts

Titanium pays well and punishes carelessness. Ti-6Al-4V and its cousins are strong, light, and corrosion-resistant — which is exactly why aerospace, medical, and defense shops keep it in the rack. But the same properties that make titanium valuable also make it hard on tooling. Get a few fundamentals right and you'll hold size, protect your edges, and keep the job profitable. Get them wrong and you'll smell it before you see it.

Here's what actually matters at the spindle.

1. Manage the heat — titanium won't do it for you

Titanium conducts heat poorly — roughly 7 W/m·K, versus around 50 for carbon steel. In steel, a lot of cutting heat escapes into the chip; in titanium, that heat stays right at the cutting edge. That single fact drives most of the rules below. Your job is to move heat into the chip and flush it away, not let it soak into the tool.

• Run flood coolant, and run it hard. High-pressure, high-volume coolant aimed at the cutting zone is the biggest lever you have. Through-tool coolant on drills and end mills is worth the setup time.
• Don't let the tool dwell or rub. A tool spinning in the cut without advancing work-hardens the surface and cooks the edge. Keep it feeding.

2. Keep surface speed low, feed steady

Titanium wants low SFM and a consistent chip load. Pushing surface speed to steel numbers is the fastest way to burn an edge.

• Solid carbide typically runs somewhere around 100–200 SFM for roughing — a fraction of what you'd use in mild steel — so start conservative and let tool life tell you where the ceiling is.
• Favor a healthy feed per tooth over high RPM. A thicker chip carries heat away; a thin, scraping chip leaves the heat behind.
• Avoid interrupted dwell and repeated air-cutting retracts that let the edge heat-cycle.

3. Rigidity is not optional

Titanium has a low modulus of elasticity — roughly half that of steel — so it deflects and springs back under tool pressure. That shows up as chatter, poor finish, and parts that measure fine under load and wrong when released.

• Use the shortest tool that reaches, minimize overhang, and choke up in the holder.
• Hold the part rigidly and support thin walls. Climb mill where the setup allows to keep cutting forces predictable.
• A rigid, balanced tool holder with low runout does more for titanium than most people expect — runout concentrates wear on one flute and shortens tool life.

4. Sharp, positive geometry — and fresh edges

Dull tools rub, and rubbing work-hardens titanium into an even tougher skin for the next pass.

• Choose sharp, positive-rake geometry to shear cleanly and lower cutting forces.
• Use fine-grain (submicron) solid carbide. For heat-resistant coatings, AlTiN/TiAlN grades hold up well; for some finishing passes a sharp, polished uncoated edge works better.
• Index or replace edges early. Titanium is unforgiving of a worn tool — chasing "one more part" out of a tired edge usually costs you the part and the tool.
• Take a depth of cut that gets below the work-hardened layer left by the previous pass, rather than skimming on top of it.

5. Consider high-efficiency toolpaths

Trochoidal / high-efficiency milling keeps radial engagement light and constant, which controls heat and spreads wear along the whole flute length. On the right machine and CAM, it can dramatically extend tool life in titanium versus traditional full-width slotting.

6. Respect the chips

Titanium fines and chips are combustible. Keep chips clear of the cutting zone, don't let a nest build up, and follow your shop's housekeeping and fire-safety practices. Good chip evacuation also protects finish and edge life.

Quick reference

The bottom line

Titanium rewards a disciplined setup: keep it cool, keep it feeding, keep it rigid, and change edges before they're gone. Dial those in and titanium becomes a steady, high-margin material instead of a tool-eater.

Need cutting tools built for titanium and other tough materials? Tool Mart Supply can help you spec carbide end mills, drills, and coatings for your application — or cross-reference a tool you already run. Request a quote or send us a part number to cross-reference.