Main machining techniques for aluminum tubes include:

1. Turning: Used for precise machining of the outer diameter, inner diameter, and end faces of aluminum tubes.
2. Milling: Allows for complex machining such as slotting and drilling on the surface of aluminum tubes.
3. Laser cutting or water jet cutting: Applied for cutting and shaping aluminum tubes with high precision and efficiency.
4. CNC machining: Three-axis, four-axis, or five-axis machines can handle more complex spatial surface machining on aluminum tube parts.
5. Electrical discharge machining (EDM): Suitable for processing complex shapes or making holes in aluminum tubes.

During the machining of aluminum tube parts, care must be taken to prevent deformation and oxidation. This is typically achieved by controlling machining parameters and using appropriate fixtures to ensure dimensional accuracy and surface quality.