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.
Where Allentown Gets Its Micro Turning Done
Institutions shape what Allentown builds. Lehigh University and Lafayette College feed biomedical and mechanical engineers into the corridor, Ben Franklin Technology Partners of Northeastern Pennsylvania funds the hardware ventures they start, while the Manufacturers Resource Center in Allentown helps those ventures scale into real production. The parts that come out of this pipeline skew small and unforgiving: infusion set connectors, diagnostic cartridge pins, sensor bodies for gas equipment. That is Swiss lathe territory, not mill territory.
The established employers reinforce the same pattern. B. Braun manufactures infusion therapy devices in neighboring Bethlehem, OraSure Technologies builds rapid diagnostic instruments, Air Products engineers cryogenic and high purity gas systems from its Lehigh Valley base and Tobyhanna Army Depot, the largest full service electronics maintenance facility in the DoD, sits an hour north. Each buys turned components by the thousand: luer fittings, contact pins, orifice fittings, ferrules.
A sliding headstock lathe earns its keep on exactly this work. The guide bushing supports the bar at the point of cut, so a 0.093 inch diameter electrode pin three inches long comes off straight, and live tooling plus a sub spindle finish cross holes, flats and back side features in one setup. RivCut runs these parts in Union City, CA and ships them to Allentown in about 4 to 5 business days by ground, faster by air.
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.
Where Swiss Machining Fits in Allentown
From prototypes to bar-fed production, this is Allentown's Swiss workload.
Medical Devices & Diagnostics
Infusion therapy hardware from the B. Braun supply chain and diagnostic instruments from the OraSure orbit both live on small stainless and polymer turned parts, and Lehigh Valley Health Network procurement expects lot level traceability behind all of it. RivCut Swiss turns luer fittings, cannulated pins, check valve poppets and instrument shafts from 316L, 17-4 PH, PEEK and Delrin with material certs and first article inspection on every lot, at prototype single pieces or validated 50,000 piece bar fed runs.
Defense & Depot Electronics
Tobyhanna Army Depot pulls machined electronics hardware through the whole Lehigh Valley supply base, and Mack Trucks defense programs add chassis and powertrain component demand on top. The connector end of that work is pure Swiss geometry: gold plated contact pins, RF connector bodies, hex standoffs and ferrules with concentricity held to 0.0002 inches TIR. RivCut is DDTC registered and quotes ITAR controlled work with the MIL-DTL-5541 chem film and MIL-A-8625 anodize callouts depot level electronics require.
Industrial Gas & Flow Control
Air Products designs compressors, cryogenic systems and ultra high purity gas delivery equipment in the Lehigh Valley, and Victaulic builds flow control systems in nearby Easton. Both categories consume precision turned internals: valve spools, orifice fittings, seat inserts and sensor housings in 316 stainless, brass and Monel. Swiss turning holds the sealing diameters and surface finishes, Ra 16 microinches as machined, that high pressure and cryogenic service demands, without a secondary grinding operation.
What Allentown Engineers Ask Us
Everything Allentown buyers ask before the first PO.
Swiss Machining Beyond Allentown
Swiss Precision, Delivered to Allentown
From first article to bar-fed production, quoting for Allentown starts with one CAD upload.