Planetary Milling Machine: Work and Cutter

Answer:
The correct answer is option 'A' - the work is stationary and the cutter is revolving.

Explanation:
A planetary milling machine is a type of milling machine that is used for precision machining of materials. It consists of a workpiece or work that remains stationary and a cutter that revolves around the workpiece. This arrangement allows for efficient and accurate milling operations.

Key Points:
- Planetary milling machine: A type of milling machine used for precision machining of materials.
- Work: The workpiece or material being machined.
- Cutter: The tool used for cutting and shaping the workpiece.

Working Principle:
The planetary milling machine operates on the principle of multiple simultaneous rotations. The workpiece is held stationary in the machine, while the cutter revolves around it. This rotational movement of the cutter allows it to remove material from the workpiece and shape it according to the desired specifications.

Advantages of the Stationary Work and Revolving Cutter:
1. Stability: The stationary workpiece provides a stable base for machining operations, ensuring accuracy and precision.
2. Flexibility: The revolving cutter can be easily adjusted and positioned to achieve different cutting angles and depths.
3. Efficiency: The rotational movement of the cutter allows for faster material removal and higher machining speeds.
4. Improved Surface Finish: The combination of stationary work and revolving cutter results in a smoother surface finish of the machined part.
5. Reduced Tool Wear: The rotating cutter distributes the cutting forces evenly, reducing wear and tear on the tool.

Applications:
The planetary milling machine is widely used in various industries for precision machining operations, including:
- Aerospace: Machining of aircraft components.
- Automotive: Production of engine parts, gears, and other automotive components.
- Electronics: Manufacturing of electronic devices and components.
- Medical: Production of medical implants and instruments.
- Tool and Die: Fabrication of molds, dies, and tooling components.

Conclusion:
In a planetary milling machine, the workpiece remains stationary while the cutter revolves around it. This configuration offers several advantages, including stability, flexibility, efficiency, improved surface finish, and reduced tool wear. The machine finds applications in various industries for precision machining operations.