Why are high-speed twist drill bits preferred for drilling in plastics?

High-speed twist drill bits are favored for drilling in plastics primarily because they disperse heat effectively during the drilling process. When drilling hard materials like plastic, friction generates heat, which can weaken the integrity of the material and lead to melting or deformation. Twist drill bits are designed with flutes that allow for effective removal of chips and shavings, as well as airflow that helps dissipate the heat away from the cutting zone. This capability to manage heat is crucial in preventing damage to plastic, allowing for cleaner and more precise drilling.

While other attributes, such as cutting speed and cleanliness of the cut, are important, the ability to disperse heat directly addresses one of the critical challenges faced when machining plastics, ensuring a better overall result.