Frequently Asked Questions #
The questions below are based on KINWA’s official lathe knowledge guide. The answers are summarized for quick reading; the full answers are available on the official FAQ page.
What is a lathe? #
A lathe is a machine tool that rotates a workpiece while a cutting tool removes material. It is used to machine cylindrical surfaces, faces, tapers, threads and other rotationally symmetric features. The workpiece is usually held in a chuck or other workholding device and rotated by the spindle while the tool moves to create the required size and shape.
What is turning? #
Turning is a machining process in which a rotating workpiece is cut by a feeding cutting tool. A lathe is the primary machine used for turning. Common operations include external turning, facing, boring, taper turning, grooving, parting and thread cutting.
How does a lathe work? #
The spindle rotates the workpiece to create the primary cutting motion, while the cutting tool feeds longitudinally, crosswise or at an angle. By controlling spindle speed, feed, depth of cut and tool position, the required dimensions and geometry are produced.
What is a manual lathe? #
A manual lathe, also called a conventional lathe, is a lathe in which the operator directly controls tool position, feed and the machining process. It is suited to one-off parts, high-mix low-volume work, repair, fitting and jobs that require frequent on-the-spot adjustment.
What is a CNC lathe? #
A CNC lathe is controlled by a computer numerical control system. The control executes a machining program to manage spindle operation, tool position, feed movement and machining sequence. CNC lathes are commonly used for repetitive machining and production runs.
What shapes and parts can a lathe machine? #
A lathe is mainly suited to workpieces with rotationally symmetric features: outside diameters, bores, faces, tapers, threads and grooves. Common examples include shafts, sleeves, bushings, rollers, flanges and fittings. Actual capability depends on workpiece size, material, workholding, tooling, accuracy requirements and machine configuration.
Why do metalworking shops need lathes? #
Lathes support shafts, sleeves, repair parts and other rotational components. They provide flexibility for one-off, low-volume, repair and repeat production, and increase in-house machining capability. Shops that regularly process rotationally symmetric parts can reduce dependence on outside suppliers.
What is the main difference between manual and CNC lathes? #
Both can perform outside turning, boring, facing and threading. The main difference is control: a manual lathe relies on the operator to position the tool and control the process in real time, while a CNC lathe executes a program and predefined cutting conditions. Manual lathes offer flexibility; CNC lathes offer repeatability and production efficiency.
Are manual lathes still worth buying? #
Yes, in the right production environment. Manual lathes remain practical for one-off parts, low-volume work, repair, prototyping and jobs requiring direct shop-floor adjustment. The decision should be based on workpiece type, production volume, operator capability and workflow, not on automation level alone.
Can a manual lathe perform precision machining? #
Yes. Achievable accuracy depends on machine condition, tooling and workholding, cutting conditions, measurement methods and operator skill. A manual lathe should not automatically be considered a low-accuracy machine, but its actual capability must be evaluated for the specific part and tolerance.