Greno Industries

Large Diameter Turning


Large Diameter CNC Turning & VTL Services

AS9100 Certified | ITAR Registered | Up to 90” Diameter

When standard lathes fall short, Greno Industries delivers precision for oversized, heavy-duty components. Operating out of our Scotia, New York facility, we utilize high-rigidity Horizontal Turning Centers and heavy-duty Vertical Turning Lathes (VTLs) to hold tight tolerances on complex geometries, massive forgings, and high-strength superalloys.

Quick Specs: Large Part Turning Limits

  • Maximum Swing / Diameter: Up to 90 inches (VTL capacity)

  • Machining Axis Configurations: Multi-axis simultaneous turning, dual-turret processing, and live-tooling milling.

  • Material Specializations: Inconel, Titanium, Stainless Steel, Carbon Steel, Alloy Steels, and Aircraft-Grade Aluminum.

  • Quality Compliance: AS9100 Certified, ISO 9001:2015, ITAR Registered (CAGE: 62654).

Advanced Heavy Turning Infrastructure

Vertical Turning Lathe (VTL) Fleet

  • Toshiba 80-Inch VTL (Live Tooling): Engineered for maximum swing capacity on ultra-heavy rings, casings, and flanges where perpendicularity is critical.

  • New Century CNC 76 (Live Tooling): Features integrated live tooling to perform multi-axis milling, drilling, and tapping on oversized components in a single setup.

  • King CNC 72 Heavy-Duty VTL: Built for rigid, high-torque cutting forces required for heavy material removal on massive castings.

Horizontal Turning Center Fleet

  • Okuma LU7000EX (Dual-Turret & Live Tooling): High-rigidity, high-throughput horizontal processing with dual-turret capabilities and live milling for complex shafts and housings.

  • Okuma LOC650 4-Axis Simulturn (Dual-Turret): Designed for heavy-wall cylinders and long shafts requiring complex grooving or intricate geometric profiles.

  • Okuma L470BB Precision Lathe: Delivers extreme spindle power and stability for long, heavy alloy steel components.

Horizontal vs. Vertical Turning

Machining Attribute Horizontal Turning Services Vertical Turning Lathe (VTL) Services
Primary Part Profile Long shafts, heavy-wall cylinders, rollers. Wide, heavy, flat, or awkwardly shaped parts.
Material Entry Forms Bar stock, long forgings, continuous shafts. Large castings, massive rings, heavy flanges.
Geometric Strengths Straightness, parallelism, concentricity over length. Perpendicularity, flatness, roundness on large OD/ID.
Thin-Walled Parts Not recommended (jaw pressure risks part distortion). Highly recommended (gravity aids fixturing with lower pressure).
Chip Evacuation Gravity-assisted lateral chip flow away from cutting zone. Requires active management within the vertical bore.

Large Part Turning is Just Part of What We Do

We don’t just turn parts—we deliver completed assemblies. By pairing our large diameter CNC services with our specialized in-house secondary services, we streamline your procurement:

  • CNC Milling

  • Production Welding (MIG, TIG, and Stick Services)

  • Surface Treatment, Assembly, & Kitting

Frequently Asked Questions (FAQs)

What is the maximum part size and weight capacity for your turning services?

Our heavy-duty Vertical Turning Lathes (VTLs) accommodate large-diameter components up to 90 inches in diameter. For long, slender configurations like industrial rollers and pump shafts, our high-rigidity Horizontal Turning Centers handle extended lengths and heavy workpieces, managing significant weight loads without sacrificing geometric accuracy.

Which materials do you specialize in machining at large diameters?

We regularly machine a broad range of standard and high-performance metals. Our machinists excel at managing the unique challenges—such as tool deflection, thermal expansion, and severe work-hardening—associated with large-scale components made from:

  • Superalloys & High-Temp Metals: Inconel, Titanium, and Cobalt alloys.

  • Stainless Steels: Austenitic, martensitic, and duplex grades.

  • Structural Material: Heavy carbon steel forgings, alloy steels, tool steels, and aircraft-grade aluminum.

Are your heavy turning operations ITAR registered and AS9100 certified?

Yes. Greno Industries is fully AS9100 Rev D certified, ISO 9001:2015 compliant, and ITAR registered (CAGE Code: 62654). We maintain strict material traceability (including full mill test reports) and digital security protocols required to support critical defense, aerospace, and power generation supply chains.

What are the main benefits of using a Vertical Turning Lathe (VTL) over a horizontal lathe for wide parts?

VTLs utilize gravity to support the weight of the workpiece, seating the raw casting or forging flat on a horizontal rotary table. This orientation minimizes fixturing distortion, eliminates the spindle deflection caused by hanging a heavy part horizontally, and makes it easier to achieve precise perpendicularity, roundness, and flatness on large outer and inner diameters.

Do your turning centers support live tooling, or are milling operations handled separately?

Several of our large-format machines—including our Toshiba 80-inch VTL, New Century CNC 76, and Okuma LU7000EX horizontal lathe—are equipped with multi-axis live tooling. This capability allows us to perform turning, face-milling, cross-drilling, and tapping in a single setup, which reduces cycle times, eliminates fixture repositioning errors, and lowers overall part costs.

Do you handle low-volume prototypes or only high-volume production runs?

We support both. Our facility is structured to handle everything from one-off prototype development and emergency replacement parts for heavy equipment to ongoing, high-volume production schedules for global industrial OEMs.

Turning Large Parts is Our Business

Machine shops with standard lathes fall short when it comes to large parts. Greno is different because we’re built to turn oversized, heavy-duty components while holding tight tolerance on complex geometries. How can we help you?