What should be done prior to drilling for tenon pins?

Prior to drilling for tenon pins, ensuring that the barrel is fully seated is essential because it guarantees proper alignment and stability during the drilling process. If the barrel is not seated correctly, it may lead to misalignment of the holes, resulting in poorly fitting pins or a weakened joint. This step ensures that all components are securely in place and that the drill bit penetrates at the intended angle and depth, assembling the pieces accurately.

Using a template for alignment, marking the drill spots clearly, and measuring the diamond pattern are all useful practices for ensuring precision in woodworking, but they serve different purposes. A template helps with consistent spacing and alignment in repetitive tasks. Marking drill spots clearly aids in visibility and accuracy when drilling. Measuring the diamond pattern is typically specific to particular joinery techniques. However, none of these steps address the fundamental requirement of having a secure and stable base, which is why making sure the barrel is fully seated is the critical first step.