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.
Bellevue Went From Suburb to Spec Sheet Capital
Bellevue's manufacturing story runs opposite to most cities on this list. It never filled up with mills and foundries. Instead it filled up with the headquarters and engineering floors that decide what gets built: PACCAR, which designs Kenworth and Peterbilt trucks from its Bellevue offices, T-Mobile USA, Microsoft's second campus, Valve and Bungie on the game hardware side and Esterline, whose aerospace and defense components carried real machining pedigree on the Eastside for decades. The drawings originate here even when the chips fly somewhere else.
That identity shapes what Bellevue teams actually buy. A PACCAR powertrain group, a Valve hardware lab or a startup out of Bellevue College's engineering pipeline is rarely shopping for castings by the ton. They need small precision turned components, connector pins for a controller board, a titanium sensor housing for a truck telematics unit, a batch of stainless standoffs for a headset prototype, made right and made fast without standing up their own shop.
Swiss turning fits that demand better than any other process. The guide bushing supports the bar at the point of cut, so a 3 inch long shaft at 0.156 inch diameter comes off straight, and live tooling plus a sub spindle finish cross holes, flats and back work in one setup. RivCut runs these parts in California and grounds them to Bellevue in 1 to 2 business days, with air freight when a build cannot wait.
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.
What Bellevue Teams Send to Our Swiss Lathes
What Bellevue buyers actually order, sector by sector.
Aerospace & Defense
Esterline built its reputation on avionics and defense components from the Eastside, and the Boeing narrowbody line in Renton sits 15 minutes down I-405, so Bellevue engineering teams live inside one of the densest aerospace supply networks in the country. The turned hardware that network consumes is classic Swiss work: clevis pins, static and pitot fittings, connector contacts and lockwire drilled fasteners in 303 stainless, 2024, 7075 and Ti-6Al-4V. RivCut delivers them with full material traceability, AS9102 style first article reports and concentricity held to 0.0002 inches TIR.
Consumer Electronics & Hardware Startups
Valve shipped VR hardware, Bungie and Microsoft keep controller and peripheral programs alive and Bellevue's startup layer prototypes constantly in the space between software and device. Those products depend on turned micro components: gold plated contact pins, antenna elements, camera lens barrels, threaded inserts and stainless standoffs under 0.25 inches in diameter. Swiss lathes hold Ra 16 microinch finishes as machined, which matters when the part is cosmetic as well as functional, and no MOQ means a 25 piece prototype run quotes as cleanly as a 25,000 piece bar fed production run.
Heavy Vehicle & Industrial Systems
PACCAR directs Kenworth and Peterbilt engineering from Bellevue, and modern truck programs are dense with small turned parts that never show up in the brochure: fuel system fittings, valve spools for air and hydraulic circuits, sensor housings for telematics and emissions monitoring and hardened dowels for tooling. RivCut Swiss machines these from 4140, 17-4 PH, 440C and brass, holding length to diameter ratios past 20 to 1 on injector adjacent components, and supports blanket orders so a validated part number reorders at the same price every quarter.
Common Questions from Bellevue Teams
How Swiss turning, quoting and shipping work for Bellevue teams.
Swiss Machining in the Bellevue Region
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