How often is it recommended to check countersink diameters to ensure proper dimensions?

The recommended frequency for checking countersink diameters is every 10 to 20 holes. This guideline is rooted in the need for maintaining consistent quality and precision during machining or assembly processes in aerospace applications. Regular checks help ensure that the dimensions remain within the specified tolerances, preventing issues such as misalignment or improper fastening that can arise from dilapidated countersink sizes.

Checking too frequently, such as after every hole or less frequently than every 20 holes, could either lead to unnecessary delays in the assembly process or allow defects to accumulate, which can compromise the integrity of the assembly. Therefore, the interval of every 10 to 20 holes strikes a balance between efficiency and quality assurance, making it a commonly accepted practice in the industry for maintaining operational standards.