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 Article to Bar-Fed Production for San Diego
The economics of small turned parts change three times on the way from prototype to production, and San Diego teams feel every step. A NuVasive-tier spinal device startup validating a titanium bone screw needs 10 pieces with full documentation. Clinical builds push that to 500. A cleared device sold through national distribution needs 20,000 per quarter at a piece price the reimbursement model can survive. Swiss turning is the only lathe architecture that covers all three stages on the same machine, same program and same process validation, which is why medical buyers across Sorrento Valley and Kearny Mesa spec it by name.
The defense side of the county runs the same math at different volumes. General Atomics UAS programs in Poway, NAVWAR systems work at Point Loma and the shipboard maintenance demand radiating from Naval Base San Diego all consume connector pins, contact pins, fuel fittings and hydraulic valve spools in bar-fed quantities. Guide bushing support keeps a 0.093 inch diameter contact pin straight and concentric to 0.0002 inch TIR at length-to-diameter ratios past 20 to 1, and live tooling plus a sub-spindle means cross-holes, flats and back-end features come off in one setup with no second operation to requote.
RivCut runs this work from our Union City, CA shop, about a day of ground transit up Interstate 5. Prototypes ship in days, production releases run lights out on dedicated bar stock and the unit price drops steeply once a San Diego part earns a standing schedule.
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 San Diego
How demand for small turned parts breaks down across San Diego.
Medical Devices & Implants
San Diego is one of the deepest med device labor pools in the country, with NuVasive spinal systems, ResMed respiratory hardware, Tandem Diabetes Care insulin pumps and Dexcom wearables all engineered locally. The turned components behind those products are classic Swiss work: cannulated bone screws, luer fittings, fluid path unions, sensor housings and electrode pins in titanium, 316L and PEEK. RivCut turns them with full lot traceability, material certs and first article reports, and the same validated process carries a part from a 25 piece design verification build into multi-thousand piece production.
Defense & Naval Systems
The largest naval fleet concentration in the world sits in San Diego Bay, and the supply chains around Naval Base San Diego, NAVWAR and General Atomics in Poway order small turned hardware constantly: MIL-spec contact pins for shipboard connectors, valve spools for hydraulic and fuel systems, standoffs and ferrules for electronics enclosures. We machine these from 303, 17-4 PH, brass and beryllium-free copper alloys, hold concentricity to 0.0002 inch TIR and support the ITAR-controlled documentation defense primes audit for.
UAS & Electronics Hardware
Between Northrop Grumman's Triton work in Rancho Bernardo, the General Atomics Predator and Reaper lines and the connector-dense hardware Qualcomm's ecosystem spins up in Sorrento Valley, San Diego buys enormous quantities of miniature precision turned parts. Gimbal pivot pins, antenna ferrules, RF connector bodies, test probe pins and slender sensor shafts all sit inside the 0.020 to 1.50 inch bar envelope. Swiss turning delivers them burr free at Ra 16 microinch finishes as machined, which matters when a pin seats in a mated connector ten thousand times.
Questions San Diego Teams Ask First
Quoting, tolerances and logistics for San Diego projects.
Swiss Turning Services Near San Diego
Put Our Swiss Lathes to Work for San Diego
One upload gets San Diego teams pricing, lead times and a guide bushing feasibility check.