on turned features
on most turning jobs
before shipping
production runs
What Is CNC Turning?
Material Rotates
Bar stock or blank is loaded into the lathe chuck and spins at high speed.
Tools Cut
Carbide cutting tools move along the material to remove material and shape your part.
Part Complete
Finished part is inspected on CMM and shipped with full documentation.
Built for Precision Turning
Your turned parts need a shop that treats quality, speed, and material knowledge as seriously as tolerances.
Live Tooling Capability
Our lathes feature live tooling for milling flats, drilling cross-holes, and cutting slots — all in one setup. Fewer operations mean faster delivery and tighter tolerances.
CMM Inspection
Every turned part is CMM inspected before shipping. You get a documented inspection report with every order — no guessing, no shortcuts.
Material Versatility
We turn aluminum, stainless steel, titanium, brass, copper, Delrin, PEEK, nylon, and polycarbonate. Every order ships with material certifications.
Fast Turnaround
Quotes in 24 hours. Prototypes in 3–5 days. Production runs on your timeline. We communicate directly — no layers of sales reps between you and the shop floor.
Turned Part Types
From precision shafts to threaded fittings — CNC turned and fully inspected.
Shafts & Spindles
Drive shafts, motor shafts, spindle assemblies, and stepped shafts in steel, stainless, and titanium. Ground finishes and tight runout tolerances.
±0.0005" runoutBushings & Sleeves
Press-fit bushings, bearing sleeves, wear rings, and spacers. Bronze, brass, Delrin, and hardened steel with precise bore tolerances.
Tight bore fitsFittings & Connectors
Threaded fittings, hydraulic connectors, barb fittings, and adapter bodies. Brass, stainless steel, and aluminum with leak-tight thread quality.
Thread class 2A/2BPins & Dowels
Alignment pins, roll pins, taper pins, and locating dowels. Hardened steel and stainless with ground OD finishes for precision fits.
Ground finishKnobs & Handles
Knurled knobs, adjustment handles, thumb screws, and control dials. Aluminum, brass, and stainless with anodize-ready finishes.
Knurling availableNozzles & Tips
Spray nozzles, dispensing tips, injection nozzles, and orifice bodies. Stainless steel and brass with micro-bore drilling and polished bores.
Micro-bore capable
Precision Shaft — 4140 Steel
Turned for a robotics OEM requiring ultra-tight runout on a motor drive shaft. Delivered in 5 business days with full first article inspection package.
tolerance held
on bearing journals
turnaround
inspection pass rate
- Dimensional inspection report (CMM data included)
- Material certification & heat lot traceability
- First article inspection report per customer spec
- Certificate of Conformance included
Documentation. Quality. Expertise.
Precision turning demands more than good parts. Here is what you get on every order.
Full Documentation
Every order ships with everything your quality team needs.
- Dimensional inspection reports
- Material certs with heat lot traceability
- First article inspection reports
- Certificate of Conformance
Verified Quality — CMM
We inspect before we ship. No exceptions.
- CMM inspection on every order
- NIST-traceable calibrated gauges
- ±0.001" standard, ±0.0005" critical
- Free DFM review on every upload
Precision Turning Expertise
Deep knowledge of lathe work across materials and geometries.
- Live tooling for mill-turn operations
- Thread cutting & knurling
- Swiss-type turning for small parts
- Multi-material capability
From CAD File to Shipped Parts
Three steps. No runaround. Built for engineering timelines.
Upload Your CAD File
Send your STEP or IGES file. Select material, quantity, and finish. We review for manufacturability and respond within 24 hours.
We Turn & Inspect
Your parts run on our CNC lathes with live tooling. Every order gets CMM inspection. We verify every critical dimension before anything ships.
Ship with Full Documentation
Parts ship with dimensional inspection reports, material certs, and full documentation package. Everything your quality team needs.
Why St. Louis, MO Companies Choose RivCut
St. Louis (978K metro) is known for Silicon Hills tech boom. Local industries include semiconductor, EV, robotics, defense. RivCut machines parts for teams across TX from our Union City, CA facility — with standard shipping in 2–3 business days.
All parts are CNC machined in-house at our Bay Area shop. We never broker or outsource. Learn about RivCut →
CNC Turning Questions
CNC Machining Materials Available in St. Louis
Aluminum 6061 and 7075. Stainless 304, 316, and 17-4 PH. Ti-6Al-4V titanium. PEEK, Delrin, and Nylon 6/6. Every grade ships from our shop with a full mill cert.
| Aluminum | |
|---|---|
| 6061-T6 | 40 ksi yield, machinability ~190 |
| 7075-T6 | 73 ksi yield, aerospace structural |
| 2024-T3 | Fatigue resistant, airframe skins |
| 5052 | Marine-grade, formable |
| Steel | |
| 1018 | Low carbon, weldable |
| 4140 | Pre-hard 28–32 HRC, high strength |
| 4340 | Quenched & tempered, ultra-high strength |
| A36 | 36 ksi yield, structural |
| Stainless Steel | |
| 303 | Free-machining, sulfur-bearing |
| 304 | Austenitic, weldable, general purpose |
| 316 | Mo-bearing, marine and chemical grade |
| 17-4 PH | H900, ~190 ksi UTS |
| Titanium | |
| Grade 2 | CP titanium, weldable, biocompatible |
| Ti-6Al-4V (Grade 5) | 120 ksi yield, aerospace and medical |
| Brass & Copper | |
| C360 Brass | 100% machinability rating |
| C110 Copper | ~100% IACS conductivity |
| C101 Copper | Oxygen-free, ~101% IACS |
| Engineering Plastics | |
| Delrin (Acetal) | Low friction, dimensionally stable |
| PEEK | 250°C service temp, chemical resistant |
| Nylon 6/6 | Wear resistant, ~12 ksi tensile |
| UHMW | Impact resistant, low friction |
| Polycarbonate | Transparent, ~9 ksi tensile |
| PTFE (Teflon) | 260°C, chemically inert |
Don’t see your grade? Ask us — we machine 50+ alloys and polymers.
RivCut vs CNC Marketplaces vs Local Machine Shops
Why engineers in St. Louis pick RivCut over marketplaces and local machine shops. Marketplaces are fast but route your job to the lowest bidder. Local shops are trustworthy but slow on quotes and often won’t take small jobs. RivCut combines instant online quoting with the accountability of a real, in-house USA shop.
| What You Get | RivCut Best | CNC Marketplace | Local Machine Shop |
|---|---|---|---|
| Who cuts the part | Our machinists in Union City, CA | Unknown 3rd party shop | Local machinist, varies by shop |
| Country of origin | 100% USA, never outsourced | Often shipped overseas | USA, local only |
| Instant online quote | Yes — AI-priced in seconds | Yes | No — email or phone quote |
| Talk to the machinist | Yes, direct line | No, support agent only | Yes, in person |
| Free DFM review | Yes, on every order | Sometimes, paid add-on | Sometimes, informal |
| Tightest tolerance | ±0.0002 inches | ±0.005 inches typical | Varies by shop |
| Fastest lead time | 3 business days | 5–10 business days | 2–4 weeks typical |
| Minimum order | None — one part is fine | Often 5+ pieces | Often $500+ minimum |
| CMM inspection | Every order | Paid upgrade | Sometimes, manual only |
What Engineers Say About
Working With RivCut
Real reviews from real engineers. Every project matters — including yours in St. Louis.
We went through two shops before finding RivCut. Night and day difference. Parts come in right. Communication is clear. They held ±0.002" on a titanium bracket that two other shops couldn’t get right.
Aerospace PartsThey caught a tolerance issue in our drawing before production started. That saved us a full revision cycle and three weeks of delays. You don’t find that kind of attention to detail at most shops.
Medical DeviceWe needed fast turnaround on 5-axis parts for a new enclosure. RivCut delivered in 6 days. Quality was excellent. These guys move fast without cutting corners.
PrototypingThe DFM Checklist Engineers Use Before Sending CAD to a CNC Shop
14 checks for wall thickness, internal radii, tool reach, hole depth-to-diameter ratios, and tolerance stack. Catch issues before they cost you a revision cycle.
- ✓ 14-point pre-flight checklist
- ✓ Aluminum, steel & titanium-specific rules
- ✓ Printable PDF, no signup wall
CNC Turning Near St. Louis
How St. Louis's Top Industries Use CNC Turning
St. Louis's economy drives specific machining demand. Here's what we see from local teams.
Upload Your Turning CAD File
Get a fast review for manufacturability, lead time, and pricing from RivCut's turning team.
No minimums · Single prototypes to production runs · Ships anywhere in the US