What a Swiss-type lathe is
A Swiss-type lathe is a turning machine with a sliding headstock and a guide bushing. Instead of holding the bar still and moving the tool along its length, a Swiss machine feeds the bar forward through a bushing while the tool cuts right at the face of that bushing. The support point sits within a fraction of an inch of the cut, so the part barely deflects.
That single design change, cutting next to a guide bushing, is why Swiss machining dominates long, slender, high-precision parts that a conventional lathe struggles to hold round and straight.
Swiss-type lathe vs conventional CNC lathe
On a conventional CNC lathe the bar is gripped in the chuck or collet and extends unsupported toward the tool. The farther the tool moves from the chuck, the more the part flexes, which limits how long and thin a part can be before it chatters or tapers. A general rule of thumb on a standard lathe is that unsupported length beyond about 3 times the diameter (a 3:1 L:D ratio) starts to cause deflection without a steady rest or tailstock.
A Swiss-type lathe supports the bar at the cut, so it comfortably runs L:D ratios of 20:1 and higher. The practical differences:
- Slender parts: Swiss holds diameter and straightness on parts as small as 0.020 in up to about 1.25 in diameter, at extreme length-to-diameter ratios.
- Tolerance: Swiss routinely holds +/-.0002 in to +/-.0005 in on critical diameters, tighter than most conventional turning.
- Surface finish: Ra 16 to 32 uin is common as-turned, with Ra 8 uin achievable on finish passes.
- Complete parts: Swiss machines pair a main and sub-spindle with live tooling, so parts come off complete, including cross-holes, flats, threads, and back-side features.
Where Swiss machining wins
A Swiss screw machine is the right call when the part is small, long relative to its diameter, tightly toleranced, and needed in volume.
- Pins, dowels, shafts, and needles with high L:D ratios.
- Bone screws, dental posts, and surgical components.
- Electrical contacts, connector pins, and terminals.
- Fasteners, valve stems, nozzles, and fittings.
- Fuel system and hydraulic components with tight diameter control.
Common materials
- 303, 304, and 316 stainless steel.
- 17-4 PH and 15-5 PH stainless for higher strength parts.
- Titanium Grade 5 (Ti-6Al-4V) and Grade 2.
- Brass C360 and beryllium-copper for electrical parts.
- PEEK, Delrin, and other engineering plastics.
Where a conventional lathe still wins
Swiss is not the default for everything. A conventional CNC lathe or chucker is the better choice when:
- The part is large diameter, above roughly 1.25 in, and short.
- The part is stubby with a low L:D ratio, where bar support is not needed.
- The part starts as a casting, forging, or pre-cut blank rather than bar stock.
- Volume is low and Swiss setup cost is not justified.
Swiss setups take longer to dial in because of the guide bushing and multi-spindle tooling, so the economics favor Swiss on repeat production, not on a handful of prototypes.
How Wexmar runs Swiss
Wexmar runs 4 Maier MLK-32 Swiss-type lathes in Canastota, NY, sized for parts up to about 32 mm through the guide bushing, with sub-spindle and live tooling for complete parts off the machine. Every lot is inspected in-house on a Brown & Sharpe coordinate measuring machine, and we provide first article inspection (FAI) and full dimensional reports. Material comes with material certifications and DFARS-compliant traceability, and all work is made in the USA and shipped nationwide. See our Swiss machining capabilities for the full envelope and material list.
What Swiss machining costs
The ranges below are typical illustrative estimates, not binding quotes. Swiss carries higher setup cost but very low cost per part at volume because it runs complete and unattended.
| Cost driver | What it covers | Typical range |
|---|---|---|
| Setup / programming | Guide bushing, tooling, first article | $250 to $900 per setup |
| Material | Precision bar stock per part | $0.40 to $18 per part |
| Machine time | Swiss run time, main and sub-spindle | $70 to $140 per hour |
| Secondary features | Cross-holes, threads, back-side work | Often $0, done in cycle |
| Finishing | Deburr, passivate, plate | $0.30 to $9 per part |
| CMM inspection / FAI | First article and in-process checks | $75 to $350 per lot |
Cost per part vs volume
- 1 to 100 pieces: Swiss setup dominates, so cost per part is high.
- 500 to 5,000 pieces: setup spreads out and cost per part drops sharply.
- 10,000-plus pieces: lights-out running makes Swiss one of the lowest cost-per-part processes available.
Lead time
- Prototype / 1 to 50 pieces: 2 to 4 weeks.
- Production / 1,000 to 25,000 pieces: 4 to 7 weeks depending on material.
Quick decision guide
- Small, long, thin, tight tolerance, and repeat volume: choose a Swiss-type lathe.
- Large diameter, short, or low volume: choose a conventional CNC lathe or chucker.
- Not sure of the L:D ratio: parts longer than about 3 times their diameter usually run better and cheaper on Swiss.
Send a print and annual quantity through our instant quote page and we will confirm whether Swiss or conventional turning is the lower-cost path for your part.