What Is Swiss CNC Machining?
Swiss CNC machining (also known as Swiss screw machining or sliding headstock turning) feeds bar stock through a stationary guide bushing directly adjacent to the cutting tool. Because the material is supported right where the cut happens, deflection and vibration are eliminated — allowing ultra-tight tolerances, micro features, and length-to-diameter aspect ratios over 20:1 that conventional CNC lathes cannot achieve.
Bar Stock Feeds Through Guide Bushing
The raw bar feeds through a carbide-lined guide bushing, providing zero-clearance support right next to the cutting insert.
Sliding Headstock Moves Along Z-Axis
Instead of moving the cutting tool along the part, the headstock advances the bar past fixed gang tooling, maintaining maximum rigidity.
Live Tooling & Sub-Spindle Dual Machining
Cross-milling, axial drilling, threads, and back-side features are completed in a single setup before parting off the finished part.
Where Auburn's Machining Talent Comes From, and What It Buys
Few cities of Auburn's size carry this much machining institutional weight. Boeing's Auburn Fabrication Division is among the largest airplane parts plants anywhere, and it has trained generations of machinists, quality engineers and NC programmers who now run the surrounding supplier base. Green River College feeds that pipeline with manufacturing and trades programs a short drive from the plant gates. The result is a buyer community that reads a first article report line by line and knows exactly what a guide bushing does.
That expertise shapes what Auburn engineers send out for quote. Structural work stays local at shops like Orion Industries, while the small turned hardware, clevis pins under a quarter inch, terminals with 20:1 length to diameter ratios, fittings that must hold 0.0002 inch TIR concentricity, goes to whoever runs sliding headstock lathes well. RivCut fills that slot from our Union City, California shop. Swiss machines with live tooling and sub-spindles finish these parts in one setup, and ground freight reaches King County in 1 to 2 business days.
Demand does not stop at aerospace. Joint Base Lewis-McChord anchors defense sustainment work across the south Sound, PACCAR's heavy truck operations sit nearby and Auburn's own equipment builders turn through valve spools and roller shafts on maintenance schedules. All of it runs on small round parts made right.
Engineered for Micro-Precision & High Volume
From single medical prototypes to automated 100,000+ piece production runs — built for zero defect manufacturing.
±0.0001" Micro Tolerance
Holding ultra-precise concentricity, diameter, and thread pitch tolerances on slender pins, shafts, and medical implants where standard lathes fail.
Single-Setup Completion
Multi-axis live tooling and sub-spindles handle turning, off-center milling, cross-drilling, hex broaching, and thread whirling with zero secondary setups.
Superior Ra 16 Surface Finish
Rigid guide bushing support eliminates chatter and micro-vibration, consistently producing mirror-smooth Ra 16 µin (0.4 µm) turned surfaces as-machined.
Lights-Out Production Savings
Automatic bar feeders and continuous chip management allow 24/7 un-attended operation, dramatically lowering unit costs for mid-to-high volume orders.
Swiss Machining Services Suite
Sliding headstock capabilities engineered for challenging small-diameter components.
Micro-Miniature Turning
Machining small-diameter components down to 0.020" (0.5 mm) with tight features, internal bores, and miniature threads for medical instruments and micro-valves.
Down to 0.5 mm barHigh L/D Ratio Slender Shafts
Turning long, slender shafts and pins with length-to-diameter ratios up to 20:1 without chatter, taper, or deflection.
L/D up to 20:1Multi-Axis Live Tooling
Up to 12 axes with motorized driven tools for off-center milling, keyways, cross-drilled passages, hex flats, and helical thread whirling.
Up to 12-axis liveDual-Spindle Sub-Machining
Synchronized pick-off sub-spindle finishes the back end of the part—chamfering, counterboring, and tapping—delivering 100% complete parts off the line.
100% finished partsMedical & Implant Machining
Precision turning of Titanium Ti-6Al-4V ELI bone screws, dental implant posts, orthopedic pins, and endoscope tips with ISO 13485 quality control.
Titanium & 316L medicalHigh-Volume Bar Fed Runs
Automated 12ft bar loaders, high-pressure coolant (2,000 PSI), and automated part catchers support fast production runs from 500 to 100,000+ pieces.
500 to 100,000+ pcs
Titanium Grade 5 Dental Implant Post & Bone Screw
Swiss turned for a medical device manufacturer requiring intricate thread geometry, micro-cannulation through-holes, and tight hex drive features. Machined in a single operation with zero hand deburring required.
tolerance held
surface finish
turnaround
2,500-piece run
- Optical comparator & CMM dimensional inspection report
- Mill test certs (EN 10204 3.1) with heat lot traceability
- Passivation certs per ASTM A967 / ASTM F86
- Certificate of Conformance per medical purchase order
Swiss Turning vs. Standard Lathe vs. CNC Milling
Choose the right manufacturing method based on geometry, tolerances, and batch size.
Stocked Materials for Swiss Turning
Precision ground round bar stock in metals, medical alloys, and engineering plastics.
Titanium Alloys
Ti-6Al-4V (Grade 5), Ti-6Al-4V ELI (Grade 23), Commercially Pure Titanium (Grade 2). Ideal for biocompatible implants, dental screws, and aerospace pins.
Stainless Steels
303, 304/304L, 316/316L, 17-4 PH, 440C, Custom 455. Excellent corrosion resistance, high tensile strength, and medical compliance.
Copper & Brass Alloys
C36000 Free-Cutting Brass, C17200 Beryllium Copper, Tellurium Copper C14500. Perfect for gold-plated electrical contacts and probe tips.
Specialty & Superalloys
Inconel 718, Kovar, Nitronic 60, Hastelloy C-276, Nitinol. High-temperature and controlled-expansion applications for aerospace and energy.
Medical Plastics
PEEK (Unfilled & 30% Glass Filled), Delrin (POM-H), PTFE (Teflon), Ultem 1000, Torlon 4203. Biocompatible, autoclavable, and dimensionally stable.
Alloy & Tool Steels
4140, 4340, A2, D2, M2 tool steel. High wear resistance and toughness after vacuum heat treating for mechanical shafts and dowels.
DFM Tips for Swiss Turned Parts
Optimize your 3D CAD models and drawings for maximum Swiss machining efficiency.
1. Precision Ground Bar Stock
Because the bar slides through a guide bushing, use h8 diameter tolerance precision ground bar stock to prevent binding or loose play.
2. Thread Relief Grooves
Provide a thread relief necking groove at thread shoulders (minimum 1.5x thread pitch) to allow clean single-point thread tool retraction.
3. Corner Radii & Chamfers
Specify internal corner radii of at least R 0.010" (0.25 mm) and external 45° lead-in chamfers to ease automated tool engagement and deburring.
Where Swiss Machining Fits in Auburn
From prototypes to bar-fed production, this is Auburn's Swiss workload.
Aerospace Fabrication & Suppliers
The supplier tiers around Boeing Auburn Fabrication and composite specialists like Sekisui Aerospace buy turned hardware in steady bar-fed volumes: connector pins, static fittings, floating fastener bodies and tooling pins for assembly jigs. RivCut Swiss turns these from 7075 and 2024 aluminum, 303 and A286 stainless and Ti-6Al-4V with full mill cert traceability and AS9102 format first article reports, and we hold Ra 16 microinch finishes as machined so parts drop straight into flight or tooling assemblies.
Defense & Ground Support
Defense sustainment work tied to Joint Base Lewis-McChord and Boeing defense programs runs through Auburn subcontractors, and it carries ITAR handling expectations along with DFARS material sourcing. Swiss geometry covers the electronics and instrumentation end of that work: gold plated contact pins, connector contacts, sensor housings and instrumentation ferrules in beryllium copper, brass and 17-4 PH. RivCut machines to domestic mill heat lots with certs attached, and single setup sub-spindle work keeps concentricity at 0.0002 inch TIR on mating contact pairs.
Heavy Equipment & Hydraulics
Auburn's industrial base builds and maintains material handling systems, hydraulic assemblies and heavy truck components, with PACCAR operations close by. The wear items in that world are classic Swiss parts: valve spools ground round to tenths, hydraulic fittings, gauge pins and slender pilot shafts in 4140, 440C and bronze. We turn replacements from a print or a worn sample, with no minimum order, so a maintenance buyer can order 6 spools this month and 600 next quarter at bar-fed pricing.
What Auburn Engineers Ask Us
Everything Auburn buyers ask before the first PO.
Swiss Machining Beyond Auburn
Swiss Precision, Delivered to Auburn
From first article to bar-fed production, quoting for Auburn starts with one CAD upload.