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.
Across One Bridge from Belmont
Proximity is the practical argument first. From Union City, CA-92 crosses the San Mateo Bridge and drops onto the Peninsula a few exits north of Belmont, so a finished lot can be couriered the same afternoon it passes final inspection. Most of the country waits 2 to 5 days on ground freight from any machining vendor. A Belmont engineer iterating on a fixture pin or a fluidic fitting can have revision B on the bench the morning after revision A fails, and that loop speed changes how fast a device program moves.
The work itself skews small and exact. Belmont anchors the mid Peninsula stretch of the biotech cluster that runs from South San Francisco down through San Carlos and Redwood City, and the instruments, diagnostics and lab automation built along that corridor consume micro turned components in quantity: 316L cannulas, PEEK insulators, ferrules and manifold fittings under half an inch in diameter. Swiss turning fits because the guide bushing supports the bar at the cutting point, so a thin part with a 20 to 1 length to diameter ratio comes off straight, concentric within 0.0002 inch TIR and finished near Ra 16 microinches without grinding.
Communications and electronics round out the picture. RingCentral is headquartered on Davis Drive, Oracle's Redwood Shores campus is one town over and the hardware startups scattered between them prototype enclosures, test rigs and interconnects that need contact pins, standoffs and RF connector bodies in the hundreds, then in the tens of thousands once a design ships. No MOQ on the front end, bar fed production on the back end, one vendor across both.
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.
Belmont Industries That Run on Swiss Turning
Real part families we quote for Belmont companies.
Biotech & Medical Devices
The Peninsula biotech cluster around Belmont builds diagnostics, surgical tools and lab automation, and all of it rides on small turned metal. RivCut Swiss machines luer fittings, cannulated pins, electrode bodies and fluidic manifold fittings from 316L, titanium and PEEK with lot traceability and material certs on every shipment. Single setup live tooling means a part with cross holes, flats and a thread comes off the sub spindle complete, which matters when validation locks your process and you cannot add operations later.
Electronics & Hardware Startups
Between RingCentral's Belmont headquarters and the venture backed hardware teams along the US-101 corridor, the mid Peninsula produces a steady stream of connector pins, contact pins, RF connector bodies, standoffs and shielded housings. These are classic Swiss parts: brass, beryllium copper and 303 stainless at diameters under 0.25 inches, turned, slotted and threaded in one cycle. We run first articles in days for a pilot build, then hold the same print through 50,000 piece production without a requote every cycle.
Aerospace & Defense Suppliers
The Peninsula's aerospace base stretches from San Carlos Airport, one of the busiest general aviation fields in the country just north of Belmont, down to the defense and satellite primes in Sunnyvale, and Tier 2 suppliers in between buy turned hardware to aerospace documentation standards. RivCut Swiss turns clevis pins, fuel fittings, valve spools and sensor housings from 17-4 PH, 6061 and Ti-6Al-4V with AS9102 first article reports and full material traceability, and our DDTC registration covers ITAR controlled work.
Swiss Turning FAQ: Belmont Edition
Practical answers for Belmont engineers and buyers.
Cities Near Belmont We Serve
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