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.
Micro Turned Parts for Berkeley Research and Its Spinouts
Talent and institutions, not production plants, shape what Berkeley buys. Bioengineering labs on campus, the BAIR robotics groups and the Molecular Foundry at Lawrence Berkeley National Lab all build one-off and small-batch instruments. Each instrument is full of turned components: dowel pins, standoffs, ferrules, electrode bodies and probe tips that a milling vendor quotes badly and a manual lathe cannot hold. Swiss turning with a guide bushing is the right tool for exactly this class of part, because the bar is supported at the cut and a 3 inch long, 0.125 inch diameter shaft comes off straight and round.
The second wave of demand comes from commercialization. SkyDeck graduates and the biotech companies clustered along the Emeryville border take a lab-proven design and suddenly need 2,000 identical microfluidic fittings or connector pins instead of five. Bar-fed Swiss machining scales from that first prototype to 100,000 piece runs on the same machine, so the drawings, the tolerances and the inspection data carry straight through from grant demo to funded production.
Distance helps too. Our shop sits in Union City, about 30 minutes down I-880 from campus, so ground shipping to Berkeley typically lands in 1 business day and urgent parts can move the same day. A researcher can send a STEP file, get an instant quote and have hardware in hand before the next group meeting.
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.
Where Swiss Machining Fits in Berkeley
From prototypes to bar-fed production, this is Berkeley's Swiss workload.
Medical Devices & Biotech
Berkeley medical work concentrates on the fluidic and diagnostic side. UC Berkeley Bioengineering labs and the optofluidic platform companies descended from Berkeley Lights spec sub-thousandth accuracy on fluidic pathways, which maps directly to Swiss turned luer fittings, manifold ports and cannulated pins in 316L, titanium and PEEK. RivCut turns these with Ra 16 microinch finishes as machined and full material traceability, so the documentation is already in place when a prototype heads toward an FDA submission.
Robotics & Automation
The BAIR lab, the Robotic Learning Lab and the SkyDeck robotics startups commercializing their research all consume the same diet of small turned hardware: precision dowel pins for gripper jaws, shoulder screws for linkages, standoffs for sensor stacks and slender drive shafts with length to diameter ratios past 20 to 1. Live tooling and a sub-spindle let us finish cross-drilled pins and flatted shafts in one setup, so a robotics team gets assembly-ready parts instead of a bag of blanks that still need milling.
Semiconductor & Quantum Research
Lawrence Berkeley National Lab's Molecular Foundry and Rigetti Computing's quantum processors push turned parts into unusual materials and unusual cold. Cryogenic assemblies call for oxygen-free copper and high-purity aluminum contact pins, feedthrough bodies and sample stage hardware, held to 0.0002 inch TIR concentricity so nothing binds at millikelvin temperatures. We machine these to DOE-grade traceability expectations, with material certs and lot control on every order rather than as an upcharge.
What Berkeley Engineers Ask Us
Everything Berkeley buyers ask before the first PO.
Swiss Machining Beyond Berkeley
Swiss Precision, Delivered to Berkeley
From first article to bar-fed production, quoting for Berkeley starts with one CAD upload.