Guides / Materials

Titanium Swiss Machining for Small Precision Turned Parts

September 20, 2026

Titanium turns up on Swiss-type lathes for a specific reason: the parts that need it are often exactly the parts Swiss machines are built for. Bone screws, dental abutments, surgical instrument shafts, connector pins and small aerospace fittings are slender, feature rich and made in repeat volumes.

Machining it is well understood, but it behaves differently enough from steel that several assumptions carried over from a stainless part will be wrong. This guide covers what changes.

The grades you will meet

Grade 5, Ti-6Al-4V. The workhorse alpha beta alloy. High strength for its weight, good corrosion resistance, widely available in bar. Used across aerospace, industrial and non implant medical work.

Grade 23, Ti-6Al-4V ELI. Same alloy chemistry with extra low interstitial limits on oxygen, nitrogen, carbon and iron. The result is better fracture toughness and ductility at cryogenic and body temperature. This is the grade normally specified for implantable devices, and it carries a higher bar price and a stricter traceability chain.

Commercially pure grades, Grade 2 and Grade 4. Lower strength, better formability, excellent corrosion resistance and biocompatibility. Grade 4 appears in dental implants. CP grades machine somewhat more easily than the alloy, though they are gummier.

If your drawing says titanium without a grade, the quote you get back is a guess. Name the grade and the specification you are working to, such as ASTM F136 for ELI implant bar or ASTM B348 for general bar.

Why titanium machines differently

Titanium is not especially hard. Three other properties cause the difficulty.

Poor thermal conductivity. Heat generated at the cutting edge stays in the cutting zone instead of leaving with the chip. The tool tip runs hot, which is the main limit on cutting speed and the main driver of tool wear.

Low elastic modulus. The material deflects under cutting force and springs back after the tool passes. On a slender feature this means the part moves away from the tool and returns, which rubs the flank of the insert and generates more heat. It also makes dimensional control on long thin sections harder than the same geometry in steel.

Chemical reactivity at temperature. Hot titanium reacts with tooling materials, which accelerates wear and can weld chips to the edge.

What a shop does about it: sharp tools with the right geometry and coating, modest surface speeds, feeds heavy enough to keep the edge cutting rather than rubbing, generous high pressure coolant and careful attention to chip evacuation. None of that is exotic. It does mean lower speeds and shorter tool life than a free machining grade, and that reaches your cycle time.

The guide bushing helps here

Springback is exactly the problem a guide bushing addresses. Support sitting a few millimeters from the cutting edge limits how far a slender titanium section can deflect, which is why long thin titanium parts such as bone screws and probe shafts are natural Swiss work rather than conventional lathe work.

The trade off is bar condition. Guide bushing work wants straight, closely sized bar, usually centerless ground, and in titanium that premium is significant. On shorter parts a shop may run bushing-less on standard bar and save you money, which is one reason to describe geometry rather than dictate process. The guide bushing article covers how shops make that call.

Where the money goes

Titanium quotes are shaped differently from brass or steel quotes.

Bar cost is a major line. Price per kilogram is high before you add the ground bar premium and certification. On a part where material would be a small fraction of a brass quote, in titanium it can approach machine time.

Remnant waste matters. Every bar leaves a piece the machine cannot use, and guide bushing setups leave a longer remnant. Across thousands of bars this is a real number in titanium, and it is worth asking the shop how much bar per part you are actually paying for.

Cycle time is longer. Lower speeds and more conservative parameters than an equivalent stainless part.

Tool cost is higher. Inserts change more often. On a long unattended run, more interventions.

Chips have value. Titanium turnings are worth recycling and some shops account for that. Ask whether scrap value is reflected in the quote, especially at high volume.

The cost guide explains how these lines combine and why volume changes their weight so much.

Tolerances and finish

Typical production tolerances on titanium sit a little wider than the same geometry in a free machining grade. Springback, heat and tool wear all push in the same direction. Expect a good shop to hold tight diameters well on short features and to want a conversation about anything tight held over a long length.

Surface finish off the machine is usually reasonable but takes more work than in brass. If you need a fine finish on a sealing or sliding surface, call it out specifically and expect a finishing pass rather than assuming it comes free.

Two practical points:

• Thin walls in titanium flex more relative to strength than the modulus alone suggests. State the measurement method for thin sections.
• Titanium parts can move slightly as machining stress relaxes, especially after removing a lot of material. On critical parts, ask whether a stress relief step is appropriate.

For how to distribute tolerance across a drawing so the price follows function, see the tolerances guide.

Medical parts: traceability is the deliverable

On implant and body contact parts, the machining is only part of what you are buying. The documentation chain often takes more managing than the cycle.

Settle these before the first order:

• Material specification. ASTM F136 for ELI implant bar, ASTM F67 for CP grades, or your own controlled specification.
• Mill certificates and lot traceability. From the bar heat number through to the finished part, with lot segregation maintained.
• Cleaning and packaging. Medical parts frequently need a controlled cleaning process and specific packaging, and these are real cost lines.
• Surface treatment. Passivation to a standard such as ASTM F86, anodizing for color coding on implants, or electropolishing.
• Inspection scope. First article content, sampling plan through production and what measurement data ships with each lot.
• Quality system. Whether the shop needs a specific quality system certification for your application. Ask for the certificate, do not assume it from a website.

The inspection and quality guide covers how to agree these without turning the first order into a negotiation.

Chip handling and shop practice

Titanium chips deserve their own paragraph, because they shape how a shop runs the job.

Titanium chips are tough and springy rather than brittle, so they do not snap off the way free machining brass does. On a machine running unattended with a bar feeder, a long chip that wraps the part or the tool can mark the surface, break a tool or stop the job. Shops respond with chip breaking tool geometry, feeds chosen to keep chips short and high pressure coolant aimed at the cut.

Fine titanium chips are also combustible, so shops handle and store them separately from other swarf. This is routine practice rather than an obstacle, but it is one reason a shop that runs titanium regularly is a better bet than one taking it on for the first time.

Coolant matters more than on easier materials. Titanium holds heat in the cutting zone, and coolant delivered at the right pressure and position is what keeps the edge alive. Ask a candidate shop how it handles coolant and chips on titanium. The answer separates shops that run it daily from shops that will learn on your order.

Where titanium parts fail inspection

The common failure modes are predictable, which means they are avoidable:

Size drift through the run. Tool wear is faster than in stainless, so diameters move. This is controlled by gauging at shorter intervals and adjusting offsets, which is a process discipline question rather than a machine question.

Surface condition on slender features. Springback causes the insert flank to rub, which can leave a poorer finish than the parameters suggest. If a surface is functional, call it out so it gets a proper finishing pass.

Movement after machining. Removing a large proportion of the bar releases stress and the part can move. On critical geometry, ask whether stress relief belongs in the sequence.

Documentation gaps. In implant work, a dimensionally perfect lot with an incomplete traceability chain is not usable. Agree the documentation scope before the first order rather than after.

Reducing titanium cost without changing the grade

Where the grade is fixed by regulation or function, these still help:

1. Shrink the largest diameter. In titanium, material you turn into chips is expensive material.
2. Check whether the part can run bushing-less. Standard bar and a shorter remnant, on parts short enough to allow it.
3. Tolerance only functional features. Every tight band in titanium costs more than the same band in 303.
4. Give a real yearly volume. Bar purchasing in titanium benefits from planning more than in common grades.
5. Avoid features needing special ground tools. Tool cost is already higher here.
6. Ask about scrap recovery. At volume it is worth knowing whether it is priced in.

Getting titanium parts quoted

Send the drawing and STEP file through the RFQ form with the grade, the material specification, the yearly volume and whether you need traceability and a specific quality system. We match the part with up to three shops that run Swiss-type lathes and reply within 24 business hours.

For how titanium compares with the other options on the bar rack, see the guide to Swiss machining materials.

Frequently asked questions

Keep reading

• Stainless Steel on a Swiss Lathe: Choosing Between 303, 304, 316L and 17-4 PH
• Materials for Swiss Machining and What Each One Costs You