Large Turning Services
Large-diameter shafts, rings, and flanges with controlled runout and reliable surface finishes.
ISO 9001:2015
Made in Canada
Years of Experience
Satisfied Customers
Overview
When components exceed standard lathe sizes, precise planning for workholding, support, and inspection is key. We coordinate large-diameter turning for shafts, rings, and flanges with routing selected to match envelope, geometry, and timeline—keeping QA, documentation, and communication under one roof.
Quick Specs
| Process | Best For | Throughput | Notes |
|---|---|---|---|
| Horizontal Lathe + Steady Rest | Long shafts, journals, bearing fits | High | Excellent for length; support with tailstock/steady-rest |
| Vertical Turning (VTL) | Large rings, flanges, housings | Medium–High | Great for large diameters and heavy workpieces |
| Live-Tool Turning | Cross/axial holes, flats, keyways | High | Reduces secondary ops; feature integration |
| Mill-Turn (Large-Format) | Mixed round + prismatic | Medium | Fewer setups for complex parts (by review) |
Capabilities
- Large-diameter shafts, rollers, rings, and flanges
- Facing, OD/ID turning, grooving, thread cutting (UNC/UNF/metric), and tapers
- Bore machining and alignment for bearing/seal fits
- Workholding strategies for minimal runout (4-jaw, custom jaws, steady rests)
- Process development for heat-treated or tough alloys
- Dimensional inspection, FAI/FAIR, and traceable documentation
Equipment & Workholding
- Horizontal CNC lathes with tailstock & steady-rest support (long shafts)
- Vertical turning lathes (VTL) for high-mass, large-diameter parts
- Live-tool lathes with C-axis for integrated milled features
- Large-capacity 4-jaw/hydraulic chucks and crane-assisted loading
- In-process probing and post-process CMM verification
Design for Manufacturability (DFM)
- Call out functional TIR/concentricity only where needed; keep non-critical features at commercial tolerances.
- Include thread reliefs/lead-ins and identify any masked or no-burr faces.
- For long shafts, provide journal spacing, support locations, and preferred datum scheme.
- Specify weld-prep angles/lands and sealing-face finishes where applicable.
- Add lifting points or specify safe rigging surfaces for heavy parts.
- Provide STEP/IGES + PDF with critical fits, target finishes, and any balance/weight requirements.
We’ll review your CAD/drawing and confirm achievable tolerances, runout, and finish with the best routing before kickoff.
Typical Applications
- Marine propulsion shafts and flanged ends
- Hydraulic cylinders, heavy-duty rollers, and drums
- Large flanges, bearing housings, and collars
- Pressure-vessel rings and heads (machined features)
- Wind/energy components and bushings
- OEM repair, reverse-engineered, and legacy replacement parts
Large Turning FAQs
How do I get a fast quote on large turning?
Upload STEP/IGES + PDF with overall length/OD, critical fits (TIR/ID/OD), threads, quantity, material/condition, and your required date. We will align capacity and schedule to your part. Start your large turning quote → Include overall length/OD, TIR/fit callouts, quantity, material, and target date.
What tolerances and finishes are realistic on oversized parts?
As a starting point, ±0.005–0.010″ is common for large features with ~125–63 µin Ra finishes. Tighter bands or finer finishes may be achievable with fixturing, passes, and inspection planning.
Can you handle tough or heat-treated materials?
Yes. We plan tooling, feeds/speeds, and coolant strategy for alloy steels, stainless, and hardened conditions. Let us know hardness and any post-process requirements.
Do you provide inspection reports or FAIs?
On request we provide dimensional reports, FAIR/FAI, and certificates of conformance. CMM verification is available for critical features.
Need Large-Diameter Turning?
Share your specs and we’ll align the right capacity and schedule—then deliver with Pearson QA and documentation.
Request a Large Turning Quote