What should be done to ensure accuracy prior to countersinking?

Verifying with engineering drawings is crucial before countersinking because these drawings provide the necessary specifications regarding dimensions, angles, and tolerances. Ensuring accuracy in countersinking is dependent on adhering to these precise specifications to maintain structural integrity and alignment in the assembly process.

Engineering drawings serve as the authoritative guideline, detailing exactly what is required for the countersink operation. This includes information about the depth, diameter, and shape of the countersink, which are essential for ensuring that fasteners fit securely and that load distribution is proper.

By focusing on the engineering drawings, you also mitigate the risk of making changes to the materials or tools without having the proper guidelines, which could lead to incorrect countersinking and potentially compromise the assembly's safety and performance.