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.
Documentation First: What Tacoma Buyers Require
Start with the quality clauses, because in Tacoma they decide who gets the purchase order. Suppliers feeding Boeing programs through companies like Toray Composites, General Plastics and Cadence Aerospace flow down AS9102 first article requirements, EN 10204 3.1 mill certs and lot traceability on even the smallest turned hardware. A clevis pin without its paper trail is scrap to a Tier 1 receiving dock, no matter how well it measures.
Defense work raises the bar again. Joint Base Lewis-McChord anchors a regional contractor base that sustains vehicles, aircraft and ground equipment, and those shops need turned spares from a supplier registered with the DDTC and able to handle ITAR-controlled prints. RivCut is set up for exactly that: controlled data handling, US-only manufacturing and inspection reports formatted for government source review.
Swiss turning fits this documentation-heavy environment better than conventional lathe work because the process itself is the quality argument. The guide bushing supports the bar at the point of cut, so a slender shaft with a 20:1 length to diameter ratio comes off straight, concentric to 0.0002 inch TIR and finished near Ra 16 microinches with no secondary grinding to document. Fewer operations means a shorter, cleaner traceability chain, which is what a Tacoma quality manager actually wants.
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 Turned Parts for Tacoma Industries
The work Tacoma engineers quote most often, by industry.
Aerospace & Boeing Supply Chain
The Tacoma area sits inside the Puget Sound aerospace corridor, with Toray Composites producing carbon fiber for Boeing programs and General Plastics and Cadence Aerospace machining and molding flight hardware nearby. Composite structures and assemblies still depend on metallic details: inserts, standoffs, bushings and pins that must arrive with AS9102 FAI reports and full material certs. RivCut Swiss turns these from 7075 and 2024 aluminum, 303 stainless, A286 and titanium, single setup with live tooling so cross holes and flats never break the traceability chain.
Defense & Military Sustainment
Joint Base Lewis-McChord is the largest employer in the region, and the contractor ecosystem around it repairs and upgrades everything from C-17 ground support equipment to tactical vehicles. That sustainment work consumes turned spares in awkward quantities, 50 pieces here, 2,000 there, often from ITAR-controlled drawings. As a DDTC-registered shop with no minimum order quantity, RivCut runs those jobs at any volume and holds concentricity to 0.0002 inch TIR on spools and shafts that seal against worn bores.
Medical Devices & Health Systems
Tacoma is a health care hub, with MultiCare Health System headquartered downtown and University of Washington Tacoma feeding engineers into the regional medtech scene. Device developers here prototype and scale implants and instruments whose smallest components are pure Swiss lathe geometry: bone screws, cannulated pins, luer fittings and electrode bodies under half an inch in diameter. We machine them from 316L, Ti-6Al-4V and PEEK with lot-level traceability that drops straight into an ISO 13485 device history record.
Tacoma Swiss Machining Questions
Answers on quoting, materials and delivery to Tacoma.
Swiss Turning Around Tacoma
Ready to Quote Your Tacoma Swiss Project?
Send a STEP file and a print. We review the geometry, confirm guide bushing setup and ship finished parts to Tacoma.