What is the purpose of drill clearance?

Drill clearance refers to the space provided around the drill bit as it cuts through the material. The primary purpose is to enable the drill to pass through the material freely without binding or causing undue stress on the drill bit. This clearance is crucial during operation because if there isn't enough space, the drill bit may overheat, break, or become damaged due to excessive friction. Adequate drill clearance allows for efficient chip removal, reduces drag, and helps maintain the drill's cutting action, ultimately leading to a cleaner and more precise hole.

While ensuring a tight fit and enhancing cutting ability are important considerations in drilling operations, they are not the primary functions of drill clearance. Likewise, reducing wear on the drill bit can be a benefit of having proper clearance, but the key purpose remains to facilitate smooth passage through the material.