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.
The Diagnostics Cluster and the Supply Chain Behind It
One cluster dominates Redwood City manufacturing demand, and it is not software. Precision diagnostics companies anchored by Guardant Health and Exact Sciences, the successor to Genomic Health, employ over a thousand people across two dozen establishments in medical device work, nearly twice the national concentration. Every liquid biopsy analyzer and genomic testing instrument those teams build contains dozens of Swiss lathe parts: cannulated probe shafts, fluidic manifold fittings, pipette nozzles and precision dowels that meter, guide and align samples through the machine.
The supply chain around that cluster is just as busy. Broadway corridor startups build point-of-care platforms that need the same luer fittings and electrode bodies at prototype quantities. Seaport Centre and the Veterans Blvd industrial area host engineering tenants feeding aerospace and semiconductor programs, and Applied Materials sits 25 minutes south for teams supporting equipment builds. Swiss turning fits this whole ecosystem because the guide bushing supports the bar at the cutting point, so a 3 inch sample probe at 0.093 inch diameter comes off straight, concentric within 0.0002 inches TIR and finished near Ra 16 microinches without grinding.
Geography helps too. Our shop sits in Union City, directly across the Dumbarton Bridge, so Redwood City is at the near edge of our 1 to 2 day California ground window. Prototype bars ordered Monday are frequently in a Broadway lab by midweek, and courier delivery of hot first articles is a routine ask, not a special favor.
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.
How Redwood City Industries Use Swiss Turned Parts
Three local sectors, three very different turned parts. Here is what we machine for Redwood City teams.
Medical Devices & Diagnostics
Guardant Health's sample processing hardware and the Exact Sciences instrument lineage define what Redwood City buys in turned parts: fluidic channel components with medical-grade cleanliness, cartridge interface pins and stainless probe shafts with length to diameter ratios past 20 to 1. RivCut Swiss turns them from 316L, 17-4 PH, titanium and PEEK with cleaning protocols, contamination-controlled packaging and FDA-supporting material traceability written into the order, not bolted on afterward.
Semiconductor & Test Hardware
Chip design startups along the Broadway corridor iterate probe station fixtures and validation hardware fast, and the equipment supply chain reaching Applied Materials and the South Bay makers needs turned components with cleanroom discipline. Swiss lathes cover the fine end of that work: gold-plated contact pins, alignment dowels, gas fitting bodies and vacuum-rated ferrules in 303 stainless, beryllium copper and brass, machined burr free and packaged clean so they go straight into the tool.
Robotics & Lab Automation
Laboratory automation is where the diagnostics cluster and the robotics scene overlap. Guardant Health's sample handling instruments, Oracle campus facility automation and Broadway robotics startups all consume the same diet of small rotating hardware: gripper pivot pins, slender drive shafts, sensor housings and threaded standoffs. Live tooling and the sub spindle let us finish cross holes, flats and wrench features in one setup, so an end effector pin arrives ready for assembly instead of a second operation.
Swiss Machining FAQ for Redwood City Buyers
Lead times, tolerances, materials and shipping for Redwood City orders.
Swiss Machining Near Redwood City
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