Swiss-Type Turned Parts
Ø 3 to 32 mm on the Traub TNL 32 Swiss-type lathe — guide bushing for highest precision, bar feeder for unmanned series production.
Guide Bushing
The key feature of Swiss-type turning: The guide bushing supports the bar stock directly at the machining point. This eliminates lever arm effects — the material cannot deflect, even with long, slender parts.
Unlike conventional chuck turning, the bar moves back and forth during machining through the bushing. The tools are stationary and machine the material at the bushing. This enables tightest tolerances and surface qualities at small diameters.
Why Swiss-Type Turning?
Guide Bushing
Supports the material directly at the cutting point. No deflection, no vibration — even at L/D > 10. Enables tightest tolerances at small diameters.
Bar Feeder
Automatic material supply with 3-meter bars. The machine produces over 100 parts per bar without manual intervention.
Unmanned Production
The TNL 32 runs overnight and on weekends. Main time and counter-spindle machining in parallel — minimal cycle times.
Counter Spindle
Back-side machining without re-clamping. Complete machining in one setup — e.g., threads on both sides or facing the back.
Small Diameters
Specialized for Ø 3 to 32 mm. Pins, bolts, shafts, axles, contact pins — parts that are not economical on a conventional lathe.
Series Production
Optimized for medium and large series. Cycle times from 15 seconds per part. Consignment stock and framework agreements available.
Typical Swiss-Type Parts
Bolts & Pins
Dowel pins, cylinder pins, clamping sleeves — high precision in series.
Ø3–20 mmShafts & Axles
Slender shafts with steps, grooves and threads. L/D up to 10 and beyond.
Ø6–32 mmBushings & Sleeves
Spacer bushings, guide sleeves, thread adapters — internal and external machining.
Ø5–32 mmContacts & Pins
Contact pins, test pins, nozzle needles — highest surface requirements.
Ø3–10 mmThreaded Parts
Threaded pins, stud bolts, knurled bolts — threads M3 to M30.
Ø3–30 mmSpacers
Spacer rolls, standoffs, washers with turning/milling combination.
Ø6–32 mmValve Parts
Valve seats, valve stems, nozzle bodies — tight tolerances and fine surfaces.
Ø4–25 mmSpecial Parts
Complex geometries with cross holes, flats, slots — complete machining.
per drawingFrequently Asked Questions
Q1What is the difference between Swiss-type and conventional turning?
In Swiss-type turning, the bar stock travels through a guide bushing that supports it directly at the machining point. This eliminates deflection and enables tightest tolerances at small diameters (Ø 3–32 mm). In conventional chuck turning, the workpiece is clamped firmly in the chuck, allowing larger diameters up to Ø 300 mm.
Q2From what quantity is Swiss-type turning worthwhile?
Swiss-type turned parts are already economical from small series (20+ pieces), as the bar feeder enables unmanned production. The real sweet spot is 500 to 50,000 pieces, where unit costs are lowest.
Q3What tolerances do you achieve with Swiss-type turning?
Thanks to the guide bushing, we achieve tolerances to IT6 and surface finishes to Ra 0.4 µm. For particularly tight tolerances, we use measurement cycles with automatic correction.
Request Swiss-Type Turned Parts
Send us your drawing with desired quantity — we will calculate cycle time and unit price within 24 hours.