--- title: "Heavy VTL & Large-Diameter Turning Shops: Get Jobs Over 20 in Swing | OpenSpindle" description: "Vertical turret lathe (VTL) or heavy horizontal lathe with 20"+ swing? We send the large-diameter RFQs small CNC shops cannot touch -- forged bar, ring-rolled rings, heavy flanges. Free, no lead fees." canonical: https://openspindle.com/for-shops/large-diameter-turning updated: 2026-08-31 --- # Heavy VTL and large-diameter shops: 20" to 10 ft swing work, routed to you **For: Heavy VTL & large-diameter turning shops** The RFQs with 20 inch diameter 1020 bar, forged carbon-steel rings, and oversized flanges do not fit the prototyping-marketplace network. If your shop runs a VTL or a heavy horizontal lathe, we have the work. *Free to join* · *No lead fees* · *Heavy iron welcome* ## The large-diameter work on our board A sample of the oversize-turning RFQs we have been receiving. These parts are routinely declined by instant-quote marketplaces because they do not fit the standard CNC envelope. ### Carbon-steel bar and forged billet, 20"+ diameter - 1018, 1020, 1045, A36 forged rounds and ring-rolled rings - Shafts, hubs, flanges, bearing housings for power-gen and heavy equipment - Qty 1–20; finish turn, bore, face, and single-point thread features ### Alloy steel heavy shafts and journals - 4140 pre-hardened and 4340 bar to 18 ft long on heavy horizontal lathes - Pump shafts, rolls, turbine shafts, mill rolls - Stress relief, grinding, and in-process inspection expected on tight features ### Stainless, duplex, and nickel-alloy rings and flanges - 316, 2205, Inconel 625 forged rings for marine, chemical, and energy service - Weld-prep, boring, and face grooves on O-ring glands - NACE / sour-service documentation when the end use calls for it ### Oversize aluminum and bronze turning - Aluminum (6061 cast and wrought) housings 20–60 in in diameter - Phosphor bronze and aluminum-bronze bushings for mining and marine - Plate blanks pre-machined on the VTL for subsequent 5-axis work ## What a qualified heavy-turning shop looks like - **VTL swing / chuck size:** 24", 36", 48", or larger. Pit-mounted VTLs for 10 ft+ swing a bonus. - **Heavy horizontal lathes:** Big American, Kingston, Mazak Slant Turn, or equivalent with 20"+ swing over the ways and 10 ft+ between centers. - **Boring mill backup:** Floor-type or planer-type horizontal boring mills for faces, bores, and features too large for the VTL alone. - **Material sourcing:** Relationships with Charter, TimkenSteel, Ellwood, Scot Forge, Ulbrich, or equivalent mills for forged bar and ring-rolled rings. We often need you to source stock faster than the customer could. - **In-process inspection:** Portable CMM arm or template-based inspection on the machine; large-part layout and bluing when needed. - **Heavy rigging and shipping:** Overhead crane capacity and the dock to actually ship a 2000 lb part. We will not route a job your shop cannot physically load out. - **Secondary ops network:** Grinding, heat treat, plating, and weld-prep partners you already use. Not required in-house. ## What a heavy-iron partner gets - **Jobs priced like heavy work:** We do not pressure VTL quotes into a 48-hour prototype turnaround. 4–8 week lead times are communicated to customers before you quote. - **Free to join; no fees:** No subscription, no per-RFQ fee, no commission. The customer pays us separately from your quote. - **You see the real part:** CAD, drawing, weight, material certs required, and the ship-to location before you commit. - **Material sourcing paid up front:** Where you source the forging or billet, that cost is passed through and paid before you cut. - **Keep your own customers:** Our RFQs are from hardware teams and buyers who found us, not from your book of business. - **One-shop or network sourcing:** If a job needs rough-turning on your VTL and precision grinding at a partner, we help coordinate rather than making you quote the whole thing. ## Frequently Asked Questions ### Do you understand that an 1800 lb part is not a next-day job? Yes. Our intake flow for oversize parts captures weight, lift limits, and realistic lead time before the RFQ reaches you. If a customer is asking for a 20 inch forging in two weeks and the mill is 6 weeks out, we tell them before you ever see it. ### Who pays for the forging or billet? You source and bill it; the customer pays OpenSpindle before you release the material purchase, so you are not out of pocket on long-lead stock. ### What about trucking an oversize part? Freight is quoted and billed through us so the customer handles LTL and oversize permits; you dock-load, we handle the rest. ### Do you have the volume to be worth our time? Heavy-turning RFQs are a smaller stream than prototype CNC, but they are long-cycle and higher-value. Expect a few qualified RFQs per month per region as the content pages scale. ### What certifications do you want to see? ISO 9001 is enough for most jobs. ASME Section VIII, PED, API 6A/16A, and AWS code-weld credentials open the pressure-vessel and oilfield work. Call them out on your profile. ## Where the RFQs come from - [CNC Turning](https://openspindle.com/capabilities/cnc-turning.md) -- Large RFQs land on the general turning page. - [Welding & Metal Fabrication](https://openspindle.com/capabilities/welding.md) -- Heavy weldments often pair with VTL work. - [Carbon & Alloy Steel](https://openspindle.com/materials/carbon-steel.md) -- The materials page where 20"+ 1020 and 4140 RFQs originate. - [Energy / Oil & Gas](https://openspindle.com/industries/energy-oil-gas.md) -- Pumps, valves, pressure vessels -- the biggest source of oversize turning work. - [Industrial / OEM (coming)](https://openspindle.com/industries.md) ## Add your heavy-iron capacity and we route oversize RFQs to you List your VTL swing, max turning diameter, max between-centers, max part weight, and lift capacity. The next matching large-diameter RFQ reaches your inbox. [Apply as a shop partner](https://openspindle.com/apply.md)