What is one consequence of using a dull cutting tool?

Using a dull cutting tool leads to a poor surface finish primarily because as the tool becomes less sharp, it struggles to make clean, precise cuts. A dull edge causes the tool to tear the material instead of cutting it smoothly, resulting in a surface that has irregularities, scratches, and a generally rough texture. This negative impact on the quality of the machined part can necessitate additional finishing processes, slowing down production and increasing costs.

In contrast, while enhanced tool life, decreased cutting forces, and improved precision are desirable qualities, they are not typically associated with dull tools. A dull tool does not enhance tool life; rather, it shortens effective usage since it will require more frequent replacements. Additionally, a dull tool usually increases cutting forces as it requires more energy to cut through the material, and precision typically suffers due to the loss of control over the cutting process.