Turning and milling, also known as combined turning and milling, is a processing method that combines turning and milling on one machine tool. Turn-milling compound has the following characteristics:

1. Efficient: Turning and milling can be completed on the same machine tool, without the need to clamp the workpiece up and down multiple times, saving tooling adjustment and tool changing time, and improving processing efficiency.
2. High precision: Since turning and milling are performed on the same machine tool, the consistency and stability of the workpiece position are better, and high-precision processing can be achieved. At the same time, turning and milling can be completed in the same step, reducing errors caused by workpiece repositioning.
3. Strong flexibility: Turning and milling combined processing can be adapted to different types of workpieces, and can complete processing operations of multiple complex shapes in one clamping, such as turning outer circles, inner circles, end faces, milling grooves, hole processing, etc.
4. Save space: Using turning and milling combined processing, the functions of lathe and milling machine can be integrated into one machine tool, saving workshop space and reducing equipment investment.
5. Reduce production links: Through combined turning and milling processing, intermediate processes can be effectively reduced, the production process can be simplified, the processing and handling of parts can be reduced, and the processing cycle can be shortened while ensuring product quality.
6. Wide scope of application: Turning and milling composite processing is suitable for processing various materials, including metal and non-metal materials, and is suitable for mass production and small batch production.

In short, turning-milling is an efficient and high-precision processing method that combines turning and milling. It has the advantages of high flexibility, space saving, and reduced production links, and can meet the processing needs of a variety of workpieces.