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.
A City That Has Machined Flight Hardware for 85 Years
Few American cities carry a manufacturing identity as specific as St. Louis. McDonnell built the Mercury and Gemini capsules here, the Phantom II flew out of Lambert Field, and Boeing Defense now designs and assembles the F-15EX, F/A-18 Super Hornet, T-7A Red Hawk and MQ-25 Stingray on the same North County campus. That heritage shaped a supplier base fluent in AS9102 first articles, export control and flight-critical traceability, and it buys enormous quantities of small turned hardware: contact pins for avionics connectors, fittings for fuel and hydraulic systems, slender actuation shafts and weapon system components.
The identity is not only airframes. Emerson Electric runs its global headquarters in Ferguson, and its Fisher and ASCO valve brands set the regional standard for spools, seats and regulator internals. Downtown, Stereotaxis builds robotic cardiac navigation systems while MilliporeSigma and Washington University School of Medicine feed a medtech cluster that consumes micro turned components in 316L and PEEK. Across all three sectors the common denominator is the same: parts under 1.5 inches in diameter, often over 20:1 length to diameter, that a conventional lathe cannot hold straight.
Swiss turning is built for exactly that geometry. The guide bushing supports the bar at the point of cut, so a long thin shaft comes off round and untapered, and live tooling with a sub-spindle finishes cross-holes, flats and back-side features in one setup. RivCut runs these parts from our California shop and ships them to St. Louis in about 3 to 4 business days by ground, with air freight when a program review cannot slip.
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.
What St. Louis Teams Send to Our Swiss Lathes
What St. Louis buyers actually order, sector by sector.
Aerospace & Defense
Boeing Defense runs four active fighter and drone programs through St. Louis at once, and hundreds of Tier 2 shops in the metro feed them, alongside Scott Air Force Base sustainment work across the river. The turned hardware behind those programs fits Swiss lathe geometry precisely: connector contact pins, clevis pins, fuel and hydraulic fittings, standoffs and slender actuation shafts in 303 stainless, 7075 aluminum and Ti-6Al-4V. RivCut delivers them with AS9102-style first article reports, EN 10204 3.1 mill certs and ITAR-aware controlled information handling, so the North County receiving dock clears the shipment on the first pass.
Industrial Valves & Automation
Emerson Electric headquarters its global automation business in Ferguson, and Barry-Wehmiller builds packaging and processing lines from Clayton, which makes valve internals a staple of St. Louis purchasing. Valve spools, regulator stems, orifice fittings and solenoid plungers are classic Swiss work: tight concentricity, fine bores, hard materials. We hold 0.0002 inches TIR and machine 17-4 PH, 316 and brass with the internal deburring that Fisher and ASCO grade assemblies expect, from prototype spools to bar-fed runs of 10,000 and up.
Medical Devices & Life Science Instruments
Stereotaxis develops robotic magnetic navigation for cardiac procedures a short walk from the Arch, MilliporeSigma manufactures lab instruments across the metro and Washington University School of Medicine keeps a steady stream of device prototypes moving toward trials. That cluster orders the micro end of Swiss capability: catheter guide fittings, luer fittings, electrode bodies, cannulated pins and PEEK insulators under 0.5 inches in diameter, finished to Ra 16 microinches as machined with the lot traceability ISO 13485 documentation packages require.
Common Questions from St. Louis Teams
How Swiss turning, quoting and shipping work for St. Louis teams.
Swiss Machining in the St. Louis Region
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