How can you tell when the rivet head is flush when using a rivet shaver?

When using a rivet shaver, the indicator that the rivet head is flush is when you stop seeing chips being ejected. This signifies that the shaver has reached the surface of the rivet head and has achieved a consistent cut, creating a smooth, level plane. The absence of chips indicates that the cutting process has effectively removed the excess material, allowing the rivet head to be flush with the surrounding surface.

The other options, while they might seem relevant, do not provide a reliable method for determining if the rivet is properly flush. Hearing a distinct sound could vary based on the environment or tool condition and is not a precise indicator of flushness. Being able to see the rivet clearly might not be achievable if the shaver is still in operation, and the tool stopping functioning does not directly indicate that the rivet head is flush; it could mean a malfunction or that the tool has completed its cycle for another reason. Therefore, the cessation of chip ejection serves as the most accurate signal that the rivet is flush with the surface.