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.
What San Carlos Actually Orders From a Swiss Lathe
Start with the parts, not the industries. The biotech cluster on Industrial Road, anchored by Vaxcyte's headquarters and Natera's CAP-accredited laboratory, runs on instruments full of small turned components: dosing needles, luer fittings, valve spools in fluidic manifolds, guide pins in liquid handling decks and 316L ferrules sealing tubing runs. None of these are big parts. Almost all of them are under half an inch in diameter, long relative to that diameter and toleranced in tenths, which is exactly the geometry a guide bushing Swiss lathe exists to cut.
A second stream of demand comes from the airport. San Carlos Airport is one of the busiest general aviation fields in the Bay Area and the Hiller Aviation Museum sits on its edge, a reminder that aircraft work has deep roots here. The maintenance shops and avionics installers around the field replace clevis pins, static port fittings and antenna mount hardware in small, urgent batches, and Swiss turning handles those without tooling charges or minimums.
Then there is the hardware startup lineage. Tesla ran its first office and shop in San Carlos before anyone outside the Peninsula had heard of it, and the city still houses engineering teams building sensors, robotics and consumer devices. Those teams prototype in ones and fives, then jump to bar-fed runs of 5,000 connector pins or standoffs once a design freezes. RivCut prices both ends of that curve from the same machine.
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.
The Parts San Carlos Industries Order Most
A sector-by-sector look at San Carlos Swiss turning demand.
Biotech & Medical Devices
The Industrial Road corridor concentrates a dozen-plus biotech and diagnostics companies, with Vaxcyte headquartered at 825 Industrial Road and Natera operating a major genetics laboratory in town. Their instruments and consumable lines consume Swiss turned hardware constantly: luer fittings, cannulated pins, dosing needles and PEEK insulators, most under 0.5 inches in diameter with Ra 16 microinch finishes as machined. RivCut turns these from 316L, titanium and PEEK with full lot traceability and mill certs on every shipment.
General Aviation & Aerospace
San Carlos Airport keeps a working ecosystem of maintenance shops, avionics installers and flight operations on the field, next door to the Hiller Aviation Museum. That world wears out small turned hardware on no particular schedule: clevis pins, fuel fittings, static port fittings and instrument panel fasteners in 303 stainless, 2024 aluminum and titanium. Because Swiss lathes run bar-fed with no minimum order, a shop can order six replacement pins to print today and a production quantity next quarter at a better piece price.
Hardware Startups & Electronics
Tesla started in a San Carlos office and shop in 2003, and the city has kept a bench of small hardware, sensor and robotics teams ever since. Their bill of materials leans on exactly the parts Swiss machines excel at: gold-platable contact pins, connector shells, sensor housings, slender drive shafts and threaded standoffs. Single-setup live tooling and sub-spindle work means a milled flat, cross hole and back-face chamfer all happen in one cycle, so a pin that costs dollars as a prototype costs cents at 20,000 pieces.
San Carlos Buyer FAQ
Straight answers on Swiss work shipped to San Carlos.
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