Selecting the Ideal Industrial Big Lathe for Large-Scale Projects

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When looking for an industrial big lathe for your industrial-sized workpieces that you will be making, there are a few different types of industrial big lathes you can choose from. The experts here at Summit can help you make the best choice. Before we discuss making your industrial big lathe selection, we will answer the question of what is a big lathe and how a big lathe works. 

What Is a Big Lathe

What separates a big lathe from a standard-sized lathe is the overall size of material that can be turned in the spindle. The term “swing” is used when determining the maximum diameter of material for your lathe. Swing refers to the swing over the bed, the swing over the carriage, and the swing over the gap.

• The swing over the bed is the maximum diameter of a workpiece that can be turned over the bed of the lathe without hitting the bed. 
• The swing over the carriage is the maximum diameter of a workpiece that can be turned over the carriage of the lathe without any obstructions.
• The swing over the gap is the maximum diameter of a workpiece that can be turned when the gap section of the bed is removed.

Big lathes generally have a swing of over 36 inches with a long distance between centers up to several meters. A standard-size engine lathe has a swing of 12 to 20 inches and a distance between centers of 36 to 72 inches. The large amount of swing on a big industrial lathe makes it the ideal machine for industries like oil, mining, aerospace, and manufacturing ship parts.

Heavy-duty industrial big lathes are sought after for their rigid construction, durable components, and ability to cut features with accuracy. These big lathes are used for industries such as oil and gas, shipbuilding, mining, power and utilities, and aerospace.

How a Big Lathe Works

Big lathes work by rotating a massive workpiece while a cutting tool removes material along its length to shape it according to what part is being made. Big lathes use heavy-duty components like a robust bed, powerful headstock motor, large chucks/faceplates for gripping, and a carriage system to move the workpiece and tools. The type and actual diameter of the material will determine how fast the lathe needs to rotate to produce good surface finishes. This all has to do with calculating feeds and speeds for your big lathe. Big lathes work very similarly to standard lathes, just with added power and durability to turn larger-than-average pieces of material. 

Heavy-duty Components

Robust bed: The bed ways of these lathes are hardened and precision-ground to provide high accuracy. The bed is made of high-grade alloyed cast iron, normalized and aged to achieve maximum stability.

Powerful headstock motor: The motor that rotates the spindle is specifically designed to turn extremely heavy pieces of material. 

Large chucks: Larger than average chucks allow for the machining of large and heavy workpieces by increasing the gripping power.

Carriage system: The carriage system of a big lathe is built to carry stronger, heavier tools, which allows for increased removal of material as the part is being turned. 

Next, we will look at the type of big lathes you can choose from when making your industrial big lathe selection.

Types of Big Lathes

Oil Country Lathes (OCL): Specialized for the oil & gas industry, handling large pipes, tubes, and flanges. These lathes are robust and have a huge capacity. Oil country lathes feature a large through hole in the spindle to accommodate large pipes and other long workpieces. Additionally, these lathes offer the option for CNC compatibility. 

Big Bore Lathes: General term for large-capacity lathes with big spindle bores (up to 21 inches). These can also be used in the oil and gas industries, but are not specifically specialized for that industry. They can be customized to fit any industry. Big bore lathes also have a larger than average through hole in the spindle that can accommodate longer parts, but can also turn parts between centers or shorter parts.

Specialty Big Swing Lathes: This type of lathe has all the rigidity of an oil country lathe or a big bore lathe, but has a massive “swing over the bed” dimension. This specialty lathe can come in many different configurations, but focuses more on large-diameter parts rather than extremely long parts. 

Big Lathe Accessories

Depending on the industrial-sized workpieces you’re making, there are accessories you can add to your big lathe to customize it. These are especially useful when making long and heavy parts.

Steady rests: a device that clamps to the lathe bed and supports long or slender workpieces, preventing them from sagging, vibrating, or deflecting under cutting forces, allowing for more precise machining, especially on parts extending far from the spindle

Live Center: A live center on a lathe is a rotating support, fitted into the tailstock, that spins with the workpiece, using internal bearings to reduce friction, provide stability for long parts, and allow for higher, smoother speeds during turning, unlike a stationary “dead center” that can cause burning or binding.

CNC Compatibility: Most modern lathes have the option of adding a CNC control to the machine. This gives the machine the advantage of automation and repeatability. 

Making your Industrial Big Lathe Selection

When making your big lathe selection, you first need to consider the maximum size of material you need for the workpieces you will be making. Not just the diameter, but overall length as well. This will narrow down your search right away. Now you know the types of industrial big lathes, available accessories, and how a big lathe works. You are ready to make your own industrial big lathe selection by visiting our website at https://summitmt.com/product-category/big-lathes/ and exploring the selection of industrial big lathes that Summit offers, or by contacting us to help you make the best decision for your company or business.