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.
Swiss Turning for Plymouth's Implantable Device Supply Chain
One cluster dominates manufacturing in Plymouth, MN, and it is implantable devices. Medtronic's Cardiac Rhythm Management operation on the Plymouth campus builds pacemakers, ICDs and CRT-D systems, and every one of those devices contains Swiss lathe work: hermetic feedthrough bodies in 17-4 PH, MP35N lead contacts, titanium fasteners under a tenth of an inch in diameter. The supply chain that feeds that campus, Donatelle, Cretex Medical, Nortech Systems and Protomatic among them, buys exactly this class of part in bar-fed volume.
The cluster extends past cardiac. Olympus Surgical Technologies America machines and assembles GI endoscopy instruments nearby, and Upsher-Smith Laboratories runs pharmaceutical production on the Maple Grove border, which pulls in dosing components, valve spools and stainless fittings for process equipment. What these buyers share is a procurement standard shaped by 65 years of Medical Alley device history: full material certs, first article inspection and lot traceability are the floor, not an upgrade.
Swiss turning fits this work because the guide bushing supports the bar at the point of cut, so a slender electrode body at 20:1 length to diameter comes off straight and concentric to 0.0002 inches TIR. Live tooling and a sub-spindle finish cross-drilled and slotted features in one setup, which matters when a validated process cannot tolerate refixturing variation.
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.
How Plymouth Industries Use Swiss Turned Parts
Three local sectors, three very different turned parts. Here is what we machine for Plymouth teams.
Cardiac Rhythm Management & Implantables
Suppliers feeding the Medtronic CRM campus in Plymouth machine the smallest tolerance-critical hardware in the industry: feedthrough bodies, IPG fasteners, lead pins and electrode contacts where can-edge features run under 0.010 inches. RivCut Swiss turns these from 17-4 PH H900, Ti-6Al-4V ELI and MP35N with concentricity to 0.0002 inches TIR, Ra 16 microinch finishes as machined and documentation structured for ISO 13485-aligned quality systems.
Surgical Instruments & Endoscopy
Olympus Surgical Technologies America anchors a surgical instrument niche in the western suburbs, and instrument builders across Medical Alley buy the same turned families: cannulated shafts, biopsy forceps pivots, luer fittings and irrigation nozzles in 316L and 17-4 PH. Bone screws and dental implant bodies for orthopedic and dental programs run on the same machines, threaded and cross-drilled in a single Swiss cycle with no secondary operations to validate.
Aerospace, Defense & Electronics Manufacturing
Plymouth's contract manufacturers do not serve medical alone. Nortech Systems builds electronics and cable assemblies for aerospace and defense primes alongside its device work, and that side of the shop consumes contact pins, connector shells, standoffs and sensor housings in brass, 303 stainless and beryllium copper. RivCut runs these bar-fed from 500 to 100,000 plus pieces, with ITAR-controlled manufacturing capability for defense-flagged jobs.
Swiss Machining FAQ for Plymouth Buyers
Lead times, tolerances, materials and shipping for Plymouth orders.
Swiss Machining Near Plymouth
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