What can excessive spindle speed lead to in CNC milling?

Excessive spindle speed in CNC milling can lead to tool overheating, premature wear, and poor surface quality due to several factors. When the spindle speed is too high, friction generated between the tool and the material increases significantly. This elevated friction heats the cutting tool excessively, which can cause the tool to lose its hardness and wear out faster than intended.

Additionally, high spindle speeds can impact the quality of the finished surface. When the tool overheats and wears, it can create a poor cutting action leading to rough surfaces or undesirable finishes on the workpiece. The tool's cutting edges may also break down, further contributing to surface imperfections. This combination of high temperatures, increased wear rates, and potential tool failure emphasizes the importance of adhering to recommended spindle speeds for specific materials and tooling to ensure optimal performance and longevity of both the tool and the workpiece.

The other options suggest benefits that do not align with the outcomes of excessive spindle speeds; therefore, understanding the detrimental effects is crucial for effective CNC milling operations.