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.
How Maple Grove Became a Cardiovascular Manufacturing Capital
Thirty years ago Maple Grove was gravel pits and new subdivisions on the northwest edge of the Twin Cities. Then Boston Scientific concentrated its structural heart and coronary intervention manufacturing here, and the city's identity changed. The WATCHMAN FLX left atrial appendage closure device and the coronary stent platforms that treat millions of AFib and CAD patients are built in this ZIP code, and a supplier ecosystem grew up around that anchor: Cardiovascular Systems Inc. with its orbital atherectomy systems, SurModics with drug delivery coatings and Upsher-Smith Laboratories on the Plymouth border.
That history shapes what local engineers buy. Cardiovascular device work lives at the micro end of machining, where a catheter hub, a crimping mandrel or a guidewire ferrule measures under half an inch in diameter and carries tolerances a conventional lathe cannot repeat across a 10,000 piece run. Swiss turning was built for exactly this. The guide bushing supports the bar at the point of cut, so a 0.062 inch diameter nitinol mandrel with a 20 to 1 length to diameter ratio comes off straight, concentric to 0.0002 inches TIR and burr free.
Six miles southeast, Plymouth's Medtronic corridor extends the cluster, making the Maple Grove and Plymouth corridor one of the densest cardiovascular implant engineering zones anywhere. RivCut does not machine the implants themselves. We turn the mandrels, fixturing pins, gauges, hubs and fittings that device teams need to build, test and inspect them, shipped ground from our California shop in 3 to 4 business days or overnight by air when a validation build 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 Maple Grove Teams Send to Our Swiss Lathes
What Maple Grove buyers actually order, sector by sector.
Structural Heart & Coronary Devices
Boston Scientific's WATCHMAN FLX and coronary stent programs in Maple Grove pull a long tail of turned tooling and hardware through the local supply chain: crimping mandrels, expansion mandrels, catheter hubs, marker band gauges and delivery system core components. RivCut Swiss turns these from 316L, nitinol, Co-Cr alloys and PEEK with full ASTM material traceability, first article inspection and documentation aligned to ISO 13485 supplier expectations.
Interventional & Atherectomy Systems
Cardiovascular Systems Inc. built its orbital atherectomy platform on rotating micro assemblies, and SurModics supplies the coating and drug delivery side of the interventional market. Suppliers feeding this segment order slender drive components, electrode bodies, connector pins and PEEK insulators in 303 and 316L stainless and titanium. Live tooling and a sub spindle let us finish cross holes, flats and back end features in one setup, which keeps concentricity intact on parts that spin at high RPM inside an artery.
Pharma & Lab Instrumentation
Upsher-Smith Laboratories anchors a pharmaceutical manufacturing presence on the Maple Grove and Plymouth border, and the wider Medical Alley corridor is thick with lab automation and instrumentation builders. Their equipment consumes Swiss friendly hardware: dosing nozzles, fill needles, valve spools, sensor housings and precision standoffs in 316L and hardened stainless. We run these from single prototypes to bar fed lots of 100,000 with no minimum order quantity.
Common Questions from Maple Grove Teams
How Swiss turning, quoting and shipping work for Maple Grove teams.
Swiss Machining in the Maple Grove Region
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