Parting / Cut-off

Overview of Parting / Cut-off Processes

Parting, also known as cut-off, is a fundamental machining process in which a workpiece is separated into two or more sections. This technique is typically performed on a lathe as part of turning operations. The process involves advancing a cutting tool radially into the rotating workpiece to sever it at a specified location, producing parts of precise length and clean end surfaces.

Applications in Manufacturing

Parting is widely used in manufacturing environments where components must be separated from bar stock or tubing. It is essential in the production of shafts, bushings, rings, and other cylindrical parts. The process ensures repeatable accuracy and is integral to high-volume production as well as custom fabrication.

Process Details

• Equipment: Most commonly performed on engine lathes, CNC lathes, and automatic turning machines.
• Tooling: Specialized parting tools, often with carbide or high-speed steel inserts, are used to achieve clean cuts and minimize material waste.
• Material Suitability: Applicable to a wide range of metals and plastics, depending on tool selection and machine capability.

Advantages and Considerations

• Precision: Enables accurate length control for each part.
• Efficiency: Suitable for both high-volume and low-volume production runs.
• Versatility: Can be adapted for various materials and part geometries.

Relation to Turning

Parting is closely related to general turning processes, sharing similar machine setups and tooling. It is often the final step in a turning sequence, following operations such as facing, grooving, and threading.

Summary

Parting and cut-off processes are essential in modern machining, providing manufacturers with a reliable method to produce finished components from raw material stock. Their integration with turning operations streamlines production and supports a wide range of industrial applications.