When should you attach the air line to the drill motor?

Attaching the air line to the drill motor after setting up the drill stop is the appropriate procedure because it ensures that the drill is properly calibrated and positioned before introducing air pressure. Setting up the drill stop is critical for controlling the depth and precision of the drilling operation, as it prevents the drill bit from penetrating too deeply into the material, which could lead to damage or errors in assembly.

By waiting to attach the air line until after the drill stop is set, you can avoid any accidental activation of the drill motor while adjustments are being made. This approach prioritizes safety and accuracy, as it allows the mechanic to focus on ensuring the setup is correct without the risk of the drill inadvertently starting. Once the drill stop is adequately set and secure, the air line can be connected, and the drill can then be safely operated with consistent results.