What is the first step before using the countersink tool?

The first step before using a countersink tool is to measure the material thickness. This measurement is crucial because it helps determine the appropriate size and depth of the countersink required for the specific application. Knowing the material thickness ensures that the countersink is tailored to accommodate the fasteners that will be used, allowing them to sit flush with the surface.

Using the countersink tool before measuring could lead to misalignment, improper depth, or a countersink that does not fit the intended fastener correctly. Therefore, establishing the material thickness helps ensure accuracy and effectiveness in the assembly process.

While drilling pilot holes may be part of the process, it comes after confirming material thickness, and cleaning the drill motor, although important for tool maintenance, is not directly related to the setup for using a countersink tool.