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 U-M Lab Bench to Bar-Fed Production
The economics of an Ann Arbor turned part change three times in its life. A Michigan Medicine device spinout or a Mcity sensor program starts with a handful of prototypes, moves to a few hundred pilot pieces once funding lands, then needs tens of thousands when a strategic partner or an OEM picks up the design. Most shops price each of those stages as a separate problem. Swiss turning treats them as one: the same sliding headstock program that cut piece one runs unattended off a 12 foot bar for piece 20,000, so the unit price falls steeply while the dimensions do not move.
That curve matters here because the buyers are unusually mixed. Toyota Research Institute, Bosch and Continental engineering offices order AV sensor hardware in pilot quantities, Universal Robots' U.S. headquarters anchors a cobot ecosystem that buys dowels, standoffs and drive pins in production volume, and Ann Arbor SPARK companies sit everywhere in between. What they share is geometry: small diameters, long length-to-diameter ratios past 20:1, tight concentricity. Guide bushing support at the cut keeps a 0.125 inch diameter probe shaft straight over 3 inches, something a conventional lathe struggles to do at any quantity.
RivCut runs this work from our Union City, California shop and ships to Washtenaw County in about 3 to 4 business days by ground, with air freight when a sprint review or a clinical build date is fixed. Quotes are instant from your CAD, and a repeat order reuses the proven program, so the requote friction that usually punishes reorders never shows up.
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 Ann Arbor
How demand for small turned parts breaks down across Ann Arbor.
Medical Devices & Diagnostics
Michigan Medicine and U-M Biomedical Engineering feed a steady pipeline of device startups, the lineage that produced HandyLab and Accuri Cytometers, and their turned parts are classic Swiss work: bone screws with rolled or single-point threads, cannulated pins, luer fittings and electrode bodies under 0.5 inches in diameter. RivCut machines them in 316L, titanium and PEEK with full material traceability, Ra 16 microinch finishes as machined and the first article documentation an FDA design history file expects, at prototype counts and at pilot-lot volume.
Automotive R&D & Autonomous Vehicles
Mcity test programs and the Ann Arbor engineering offices of Toyota Research Institute, Bosch and Continental consume small turned hardware in awkward quantities, 10 pieces this sprint, 500 for the next vehicle build. Lidar and radar mounts need contact pins, precision standoffs and slender sensor shafts held to 0.0002 inches TIR so an array stays boresighted after Michigan winters. We turn them in 7075 and 303 stainless under NDA, ship dimensional reports with every lot and hold the program for the production release that follows a successful pilot.
Robotics & Hardware Startups
With Universal Robots' U.S. headquarters in town, May Mobility building autonomous shuttles and the U-M Robotics Institute spinning out ventures, Ann Arbor buys robot hardware at every scale. End effector work needs precision dowels and register pins that locate an ISO 9409-1 flange repeatably, while shuttle and actuator programs order drive pins, ferrules and threaded standoffs by the thousand. Live tooling and a sub-spindle let us finish milled flats, cross holes and back-side features in one setup, so a SPARK-stage startup gets production-grade parts before it has production-grade volume.
Questions Ann Arbor Teams Ask First
Quoting, tolerances and logistics for Ann Arbor projects.
Swiss Turning Services Near Ann Arbor
Put Our Swiss Lathes to Work for Ann Arbor
One upload gets Ann Arbor teams pricing, lead times and a guide bushing feasibility check.