CNC Lathe

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Used CNC lathes for sale

Looking for a used CNC lathe? CNCMachines.net carries used CNC lathes of all kinds. Our machines come ready to make quality parts for you. We have a wide range of sizes to make precision parts from bars and materials of all sizes. We carry 2-axis, 3-axis, 5-axis, Swiss lathes and vertical turret lathes. We can answer all your questions to help you determine the perfect used CNC lathe for your needs. This article will help you understand the difference between the different types of lathes and provide a practical checklist to review when buying a used CNC lathe.

What are the axes referred to for CNC machining?

Standard nomenclature for CNC machining refers to the direction of motion that a work piece can be machined from. X, Y and Z are linear axes with the Z-axis aligned with the spindle of the machine which holds the workpiece.  A, B and C are rotary axes around X, Y and Z respectively. U, V and W may be used to refer to parallel linear axes along X, Y and Z.

2-Axis CNC Lathes

A standard 2-axis CNC lathe is X, Z. Bar stock is either fed or inserted into the Z-axis through the collet and a tool cuts as the stock rotates. This is used for round parts.

3-Axis CNC Lathes and CNC Turning Centers

When a third axis (Y) is added perpendicular to X and Z, curves can be machined. These are driven by ball screw actuators. The Y-axis slides on linear guides or box ways. Many manufacturers have added other ways to move the tools, evolving the 3-axis machine into “turning centers” to be more descriptive. The line between 3-axis used cnc lathe for saleand 4-axis turning can be blurred as manufacturers add features to a 3-axis that allow for more machining angles but may not provide a full range of motion in the 4th axis.

In a 3-axis CNC turning center, tools are arranged on round turret with tooling slots. The bar stock is fed through a bar feeder and the turret is programmed to rotate and articulate on to meet the bar stock to cut the material.  Certain CNC turning centers have more than one spindle. In a dual spindle CNC turning center, the part is fed from the originated spindle to the secondary spindle where the other side of the part can have additional machining performed. The turrets on dual-spindle CNC turning centers have tool slots on both sides of the turret and can make more complex parts than those with a single spindle. The tool (on the turret) is programmed to move to the bar.

To orient a workpiece accurately for live tooling (like a drill), a rotary C-axis can be employed, creating a 4-axis machine. Tiny motors in the tooling mounted on the turret convert the lathe into a conventional milling machine. These servomotors hold position to allow for contouring motion in 4-axis CNC lathes. In this way, the machine can make profiling cuts using simultaneous X, Y and Z axes motion with the C-axis.

The complexity of the parts that can be made on these 3-axis turning centers is driven by the live tooling capabilities as well as the number of tooling slots on the turret. Some manufacturers mount independent milling heads with tool change capabilities make this machining center even more efficient.

5-Axis CNC Lathes

The fifth axis to be added is usually the A or B axis. The machine has either an XYZAC or XYZBC toolpath. It’s this B-axis capability that sets apart this kind of CNC lathe. This rotates around the Y axis making compound angle cuts possible. It’s possible to do all milling and turning operations in one setup because the machine supports the entire range of milling and turning operations. This is the most versatile of all the lathes.

CNC Swiss Lathes

CNC Swiss lathes typically make parts under 2” in outer diameter. They operate by moving a fixed tooling jig to the bar stock. These tools cut very close to the spindle makes tool changes very quick. The key difference between CNC Swiss and other CNC lathes is how the bar feeder and spindle work together to produce parts. The spindle on a Swiss CNC lathe controls the bar movement against a stationary tool on the tooling jig. The bar does the moving instead of the tool. All of the cutting is done right next to the collet. This differs from a CNC turning center where the cutting occurs as the tool moves to the bar. Swiss Lathes are great for high production work. When combined with a bar feeder, they are designed to run “lights-out” and produce parts unattended. With proper programming and operator input, they can make precise parts to specification with a high level of repeatability, often with cycle times under a minute.

Selecting a Used CNC Lathe to Purchase:

CNC lathes have many options to optimize them for production of different kinds of parts. For example, you’ll need to consider:

  • Bar capacity (maximum OD that can be bar-fed into the machine)
  • Max part length
  • Tooling capacity
  • Number of “Live” tool positions
  • Sub Spindle capabilities
  • Mist collectors
  • Attachments for long tooling
  • Collection trays
  • Tooling such as collets, guide bushings (ask what tooling comes with the machine)
  • CNC control type (Fanuc is common)
  • Tooling options
  • Feed rates
  • Bar feeders (This may come with a used CNC Swiss lathe or may need to be purchased separately. The length bar feeder determines the length bars you will buy, the space needed and the scrap rates you will have.)

Selecting the Best Size Lathe

When selecting the best size CNC Swiss lathe, you’ll want to consider the part sizes O.D. that you will be making. Just as the axis movement, live tooling, and number of tooling positions drive the complexity of parts that can be produced, the bar capacity outer diameter size determines the size parts. Bar feeders push the stock through the collets for production runs. The maximum collected and chucked sizes possible are very different. The best efficiency comes from machines that are closest to the size parts you need though you can turn something very small from a very large stock.

10 Checkpoints  – Buying Used CNC Lathes

  • Check for damage and signs of wear.
  • Call the CNC lathe manufacturer to see if they still support parts and service.
  • Research the brand and model online to see what other owners of these lathes think about the brand and support in your area.
  • Call the local distributor and talk with sales and service about support and parts.
  • Look up independent CNC lathe machine service techs to get their opinion on the reliability of the brand.
  • Search online for a similar year makes and models to see price points.
  • Get the hours of operation.
  • See if any maintenance records can be found or major repair work. Repair work isn’t a bad thing, in many cases, it will help you know what been replaced, what hasn’t and if it was done right.
  • Find out the types of material and industries it made parts for in the past.
  • Ask the owner why he’s selling the machine.

We have over hundreds of CNC lathes listed with the prices on CNCMachines.Net that can help you upgrade your shop’s technology and increase the overall output of your manufacturing production. Our team is constantly working on bringing more used CNC lathes to the market and can let you know about the next wave of used CNC lathes coming available. Contact one of our used CNC lathe experts today for more details: 844.262.6789. Get a free CNC Lathe Machine Price

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