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CNC lathes are vital for modern manufacturing. They help make very precise metal parts for planes and engines. There are two main things you can do with a lathe: turning and facing.
Although these processes may look similar, they are not the same. Each one has a specific purpose, tool path, and result. In this article, we’ll explain the differences between turning and facing so you can understand how and when to use them.
Turning is a process that uses a machine to make round, cylindrical parts. To do this, it spins the workpiece while a cutting tool moves along the centre of the part. Using this tool removes material to make the outer diameter smaller.
Here are some common ways to use turning:
Making shafts, rods and bushings.
Shaping cylinders, tapers and grooves.
Producing threads.
Machining big or small diameters
Key Turning Points:
Tool moves alongside the workpiece’s axis.
Changing diameter is the main focus.
Useful for roughing and finishing.
Usually, this is the first step in lathe operations.
Facing is used to make the end of a part flat and smooth. When you’re facing, the cutting tool moves at a right angle to the axis of the part. While the tool moves out from the centre, the workpiece rotates around it.
Here are some common uses for facing:
Make the parts shorter.
Getting surfaces ready for drilling or tapping.
Making the ends of something nice and smooth so that it can be put together.
Making surfaces flatter and neater.
Main Points:
Tool moves across the part.
What’s most important here is how long it is and that the ends are even.
Use this before or after turning.
Both ends of a part can be done.
Here is an easy-to-read table that shows how they are different.
| Feature | Turning | Facing |
| Tool Movement | Parallel to the workpiece axis | Perpendicular to the axis |
| Primary Purpose | Create cylindrical shapes | Create flat end surfaces |
| Dimension Controlled | Outer/inner diameter | Length of the workpiece |
| Typical Tool Path | Along the length | Across the face |
| Material Removal Pattern | Helical (spiral) | Circular (radial) |
| Surface Produced | Cylindrical | Flat |
| Position of Cutting Tool | Side of the part | End of the part |
When you turn it, the metal part spins really fast. This means that the cutting tool moves slowly along the length of the part. When it moves, it cut away thin layers of metal, shaping the part into a cylinder or another shape.
Two Types of Turning:
Rough Turning – Quickly removes more material.
Finish Turning – Makes small changes and improves how smooth the surface is.
Turning can also add complex features like:
Threads
Tapers
Grooves
Shoulders
With facing machining, the aim is not to reduce the diameter, but rather to ensure that the end face of the part is flat. As the part spins, the tool moves across its end, shaving off small amounts of material.
Facing can help you:
Prepare a clean start for drilling.
Make both ends of a shaft parallel.
Modify the part’s overall length.
Ensure a better level of flatness when it comes to assembly or sealing.
On CNC machining centers, face machining is typically performed using face milling cutters. The workpiece is secured to the worktable, and the spindle drives the tool to rotate. Compared to lathes, face machining on machining centers offers the following characteristics:
Greater Flexibility: Multi-axis interpolation via programming enables machining of flat surfaces or complex end faces.
Greater precision: Controllable cutting paths ensure consistent surface quality.
Higher efficiency: Multiple operations—including end-face machining and hole patterns—can be completed with a single setup.
This method is particularly suited for batch processing of large flat surfaces and complex parts, significantly boosting production efficiency.
Single-point cutting tools can be used in both operations, but the tool angles and setups differ.
Positioned at the side of the part.
Ensure the tool tip matches the height of the centre of the part.
Use with diamond- or triangle-shaped inserts.
Mount facing the end of the part.
Align to avoid raised centres or ‘domes’.
Often uses tools with a broader nose radius.
Automotive: Drive shafts, spindles and axles
Aerospace: Connect components and actuators together to form a complete system.
Medical: Implants and custom pins.
General Manufacturing: Components such as bushings, housings and rods.
Hydraulics: Ensure surfaces are clean and free from any contaminants.
Assembly parts: End-to-end contact.
Precision parts: Flat reference points.
Large shafts: Make sure that both ends are square.
When turning, you should watch out for:
Chatter or vibration lines.
Tool wear has an impact on the diameter.
Long parts are not very effective at removing chips.
In facing, common issues are:
Should the tool be off-center, a raised centre, or “nipple”, will be visible.
Uneven flatness may be caused by a fast feed rate.
Chatter if the tool is extended too far.
In order to ensure that parts meet the required standards, both the facing and turning surfaces must be inspected. Methods include:
Calipers or Micrometers: Check diameter and length
CMM Machines: Measure complex geometries
Surface Profilometers: Check roughness or finish
Visual/Tactile Tests: Quick shop floor inspections
In high-precision work, you may also use:
Roundness testers (for turned parts)
Flatness gauges (for faced ends)
Runout checkers
| Key Point | Turning | Facing |
| Purpose | Reduce diameter (round shape) | Create flat ends (shorten part) |
| Tool Direction | Parallel to part axis | Perpendicular to part axis |
| Main Effect | Controls diameter | Controls length |
| Common Tools | Side-mounted cutting tools | End-mounted or angled tools |
| Typical Parts | Shafts, rods, pins | Flanges, housings, flat faces |
Select turning if you are working with round parts that need to be a specific diameter. If you need a flat, square end, opt for facing.
Both operations are simple in concept, but require attention to detail. Using the right setup, tools and speeds will help you achieve a clean result every time.
Knowing the difference between turning and facing is the first step to making high-quality machine parts. Choosing the right process can save time, material, and money.
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Tags: CNC Turning, Facing, Machining
