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.
From First Prototype to Bar-Fed Production for Seattle
The economics of a Seattle part change fast. Amazon device teams and University of Washington spinouts order five pieces to validate a design, then need five thousand once a program is funded, and the worst outcome is requoting that jump with a new shop and new tooling. Swiss turning is built for exactly this curve. The same program that cut your prototype contact pin runs lights out on 12 foot bars, so piece 1 and piece 20,000 measure the same and the unit price falls steeply as quantity climbs.
Aerospace sets the volume ceiling here. Boeing builds the 737 MAX in Renton and widebodies in Everett, Blue Origin machines launch hardware in Kent and Electroimpact tools up assembly lines in Mukilteo, and every one of those programs consumes turned hardware, clevis pins, fuel fittings and hydraulic spools, in quantities a manual lathe cannot touch. Tier 2 suppliers feeding those lines need concentric, burr free parts with full traceability, delivered on a schedule that survives Puget Sound capacity crunches.
Swiss geometry also solves the slender part problem that trips up conventional turning. Because the guide bushing supports the bar at the point of cut, a sensor probe shaft with a length to diameter ratio over 20 to 1 comes off straight, and live tooling plus a sub-spindle finish cross holes, flats and back-side features in one setup. Ground transit from our California shop reaches Seattle in about 1 to 2 business days, so a West Coast supplier behaves like a local one.
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.
Swiss Machining Demand Across Seattle
How demand for small turned parts breaks down across Seattle.
Aerospace & Space
Boeing programs in Renton and Everett and Blue Origin's Kent factory anchor a supplier network that buys turned hardware continuously: fuel system fittings, clevis pins, valve spools and static port hardware in 7075, Ti-6Al-4V and corrosion resistant steels. These parts carry documentation expectations even at Tier 2, and a shipment with incomplete certs sits at receiving. RivCut Swiss turns them with full material traceability, first article reports and concentricity held to 0.0002 inch TIR, and pricing that improves sharply once a fitting moves from qualification lots to blanket-order volume.
Consumer Electronics & Hardware Startups
Amazon designs Echo, Kindle and Ring hardware in South Lake Union, Microsoft builds Surface and Xbox in Redmond, Valve develops Steam Deck in Bellevue and Echodyne machines radar hardware in Kirkland. All of that electronics work runs on tiny turned metal: gold-plated contact pins, connector ferrules, threaded standoffs and antenna pins under 0.125 inches in diameter. Swiss lathes hold the position and finish these interfaces demand, Ra 16 microinches as machined, and a program proven on 25 prototype pins scales to 100,000 piece runs without a tooling change.
Medical Devices & Instrumentation
Seattle med device work clusters around UW Medicine clinical research, Stryker Emergency Care's defibrillator and monitoring lines and the diagnostics startups of South Lake Union. The turned content in that ecosystem is classic Swiss territory: luer fittings, electrode bodies, cannulated instrument shafts and PEEK insulators in 316L, titanium and medical polymers. RivCut runs single prototype pieces for a development sprint, then carries the same validated program into production lots with lot traceability, so a device that clears verification does not get re-machined by a different process at scale.
Questions Seattle Teams Ask First
Quoting, tolerances and logistics for Seattle projects.
Swiss Turning Services Near Seattle
Put Our Swiss Lathes to Work for Seattle
One upload gets Seattle teams pricing, lead times and a guide bushing feasibility check.