CNC Lathe

CNC Lathe For Sale

What are the axis referred to for CNC machining?

Standard nomenclature for CNC machining refers to the direction of motion that a workpiece 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. Some of the most common brands are Haas lathes, Mori seiki, and Mazak lathes.

2 Axis Lathes

A standard 2-axis CNC lathe has X and Z axes. 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 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 and 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 a 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.

4 Axis Lathe

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 Lathes

The fifth axis to be added is usually the A or B axis. The machine has either an XYZAC or XYZBC toolpath. Its this B-axis capability that sets apart this kind of CNC lathe. This rotates around the Y axis making compound angle cuts possible. Its 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. We have 5 axis lathe listings available.

CNC Swiss Lathes

CNC Swiss lathes typically make parts under 2 inches 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

Used CNC lathes have many options to optimize them for the production of different kinds of parts. For example, youll 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 CNC Lathe

When selecting the best size CNC lathe, youll want to consider the part sizes O.D. that you will be making. Just as the axis movement, live tooling, and a 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. Some CNC lathes may already come with barfeeders, Make sure to ask the seller if it includes a barfeeder at the current price.

Applications of CNC Lathes

CNC lathes are versatile machines used in various industries to produce precise, complex parts. Here are some of the common applications:

1. Automotive Lathes:
   • Production of Engine Components: CNC lathes are used to manufacture components like pistons, crankshafts, and camshafts, which require high precision and durability.
   • Wheel Manufacturing: CNC lathes can produce rims and other automotive components with intricate designs and precise dimensions.

2. Aerospace Lathes:

   • Aircraft Components: CNC lathes are used to produce various aircraft parts such as turbine blades, landing gear components, and structural parts.
   • Satellite and Spacecraft Parts: The high precision of CNC lathes makes them ideal for producing parts used in satellites and spacecraft.

3. Medical Lathes:

   • Surgical Instruments: CNC lathes are used to manufacture surgical tools and medical devices that require high precision and smooth finishes.
   • Orthopedic Implants: CNC lathes are instrumental in producing custom implants like hip and knee replacements.

4. Electronics Industry:

   • Housing and Enclosures: CNC lathes are used to create metal and plastic housings for electronic devices, ensuring they meet exact specifications.
   • Connectors and Components: CNC lathes can produce small, intricate parts used in electronic connectors and assemblies.

5. General Manufacturing:

   • Prototyping: CNC lathes are often used in the prototyping phase of product development to create precise and functional prototypes.
   • Mass Production: CNC lathes are essential in mass-producing parts with consistent quality and precision.

How Does a CNC Lathe Work?

A CNC lathe operates by rotating a workpiece against a cutting tool to remove material and shape it into the desired form. Here’s a step-by-step explanation of how a CNC lathe works:

1. Loading the Workpiece: The workpiece, usually in the form of a bar or rod, is loaded into the machine, often through a bar feeder or manually.

2. Programming: The CNC lathe is programmed with a specific set of instructions (G-code) that dictate the movements of the cutting tool and the rotation of the workpiece. This code is typically generated by CAD/CAM software based on the desired design.

3. Setting Up the Tooling: The cutting tools are mounted on a tool turret, which can rotate to bring different tools into position as needed during the machining process.

4. Machining:

   • Spindle Rotation: The workpiece is clamped into the spindle, which rotates at high speed.
   • Tool Movement: The cutting tool moves along the X, Y, and Z axes (and possibly additional axes, depending on the lathe type) to remove material from the workpiece.
   • Cutting Process: The tool cuts, drills, or grinds the material to shape the workpiece into the desired form.

5. Finishing: Once the machining is complete, the part may undergo finishing processes such as polishing or coating, depending on the required specifications.

6. Unloading: The finished part is removed from the machine, and the next workpiece is loaded for machining.