What type of holes are typically drilled first in any assembly process?

Pilot holes are the first type of holes typically drilled in any assembly process due to their role in ensuring the accuracy and alignment of subsequent drilling operations. When a pilot hole is created, it acts as a guide for larger drill bits, allowing for more precise drilling of the final hole sizes required for assembly.

By starting with a pilot hole, mechanics can reduce the risk of drill bit wander, especially in materials that are prone to splitting or cracking. Additionally, pilot holes can help ensure that the final output aligns correctly with corresponding components, thereby improving the overall integrity and fit of the assembly.

Other types of holes, such as slot holes, through holes, and blind holes, may be incorporated into the assembly process but are generally drilled after the pilot holes. Each of these hole types has specific applications, but they rely on the foundational alignment established by the pilot holes for improved accuracy.