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.
Eighty Years of Airframes, and the Small Parts Behind Them
Manufacturing identity in Atlanta starts with the Marietta plant. Bell Aircraft built B-29s there during the war, Lockheed took it over in 1951, and today Lockheed Martin runs the longest continuous military aircraft production line in the world, turning out C-130J Super Hercules airframes and F-35 center wing assemblies. Every one of those structures is held together and plumbed through by small turned components: shear pins, bushings, fluid fittings and fastener blanks that Tier 2 suppliers across Cobb and Fulton counties are asked to deliver with DFARS-compliant material and full documentation.
The other half of the story is maintenance and movement. Delta TechOps at Hartsfield-Jackson operates the largest airline MRO facility in the world, and Robins AFB southeast of the metro keeps C-130, F-15 and C-17 fleets flying, both of which burn through replacement pins, spools and fittings on schedules set by grounded aircraft rather than purchasing calendars. Swiss turning fits this demand pattern because the guide bushing supports the bar at the point of cut, so long slender parts come off straight and concentric to 0.0002 inches TIR without secondary grinding.
Newer layers have grown on top of the aviation base. Georgia Tech spins device and hardware startups out of the Petit Institute and ATDC, Emory anchors biomedical research, and the EV corridor built around Kia Georgia and SK Innovation pulls connector and battery-module hardware into the region. All of it runs on the same class of small turned metal that a sliding headstock lathe produces faster and more repeatably than any other process.
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 Atlanta Teams Send to Our Swiss Lathes
What Atlanta buyers actually order, sector by sector.
Aerospace & Defense
Lockheed Martin Marietta, Delta TechOps and the Robins AFB depot chain define what metro Atlanta buys in turned hardware: shear pins, bushing blanks, hydraulic and fuel fittings, static port hardware and fastener specials that carry Lockheed quality clauses and DFARS domestic melt requirements. RivCut Swiss turns these from 2024 and 7075 aluminum, 303 and 17-4 PH stainless and Ti-6Al-4V with mill certs, first article reports and lot traceability attached, so a Marietta receiving desk has nothing to reject on paperwork.
Medical Devices & Research
Emory University's biomedical programs, Georgia Tech's Petit Institute for Bioengineering and Atlanta's connected-health companies generate steady demand for the micro end of Swiss work: bone screws, cannulated pins, luer fittings, electrode bodies and hermetic sensor housings under half an inch in diameter. We run 316L, titanium and PEEK with Ra 16 microinch finishes as machined, and we quote single prototypes for research teams the same day we quote 10,000 piece production for device manufacturers.
EV, Electronics & Connected Hardware
Georgia's EV corridor, Kia Georgia in West Point and SK Innovation's battery plant in Commerce, plus Atlanta electronics makers like NCR Voyix and the hardware startups coming out of ATDC, all consume connector-scale turned parts: contact pins, terminal pins, standoffs, ferrules and shielded housing components. Swiss lathes with live tooling finish these in one setup, flats, cross holes and threads included, in copper alloys, brass and stainless at the 500 to 100,000 piece volumes bar feeding makes economical.
Common Questions from Atlanta Teams
How Swiss turning, quoting and shipping work for Atlanta teams.
Swiss Machining in the Atlanta Region
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