What should be done immediately after placing the tip of the largest reamer into the pilot hole?

Ensuring lubrication immediately after placing the tip of the largest reamer into the pilot hole is crucial for multiple reasons. Proper lubrication reduces friction between the reamer and the material being worked on, which helps in mitigating heat generation and wear on the cutting edge of the tool. This is particularly important in aerospace assembly, where precision and equipment longevity are paramount. Lubrication also aids in producing a smoother finish on the hole's surface, which is necessary for the integrity of subsequent assembly processes.

In addition, lubrication can help to prevent the reamer from binding or seizing within the material, allowing for a more efficient and controlled cutting process. The presence of lubrication also helps to evacuate chips and debris from the cutting area, further enhancing the reaming operation's effectiveness.

While starting the motor, verifying the diameter, and removing the reamer are important steps in their own right, they should follow the lubrication step to ensure optimal conditions for operation. Thus, ensuring lubrication is the critical first action that should be taken after positioning the reamer.