What does “common cutting speed” depend on?

The concept of “common cutting speed” is influenced primarily by the type of material being machined, the material of the cutting tool, and the desired surface finish of the workpiece. Each of these factors plays a significant role in optimizing machining performance.

Different materials have varying hardness, tensile strength, and thermal conductivity, which affects how quickly a cutting tool can effectively cut through them without causing damage or excessive wear. For example, a harder material may require a slower cutting speed to prevent tool wear and ensure satisfactory cutting results.

The material composition of the cutter itself also impacts cutting speed. High-speed steel and carbide tools have different properties that allow for different cutting speeds based on their durability and heat resistance. Tool geometry and coatings can further enhance the cutting capacity, allowing for higher speeds without compromising the quality of the finished surface.

Additionally, the desired surface finish is crucial. A finer finish often requires slower speeds and finer feeds to minimize tool marks and ensure a smooth surface. Conversely, for roughing operations where surface finish is less critical, higher speeds may be applicable to increase efficiency.

Options suggesting that factors such as only the operator's experience, the age of the milling machine, or the size of the milling cutter determine common cutting speed overlook the essential cutting dynamics related