How do you know when the rivet head is flush while using a rivet shaver?

The correct choice is determined by the fact that when you stop seeing chips being ejected, it indicates that the rivet head has been adequately shaved down to a flush position with the surface. During the riveting process, a rivet shaver removes material from the rivet head until it is level with the surrounding material. The ejected chips are a direct result of this material removal; hence, the cessation of chip ejection signals that the shaver has no more material to remove, implying the rivet head is now flush.

Monitoring the ejection of chips is a practical visual cue for the operator, ensuring that quality control is maintained during assembly. This technique allows for a straightforward assessment of whether the rivet head has met the flush requirement without needing to rely on more subjective or indirect indicators, such as noise or changes in color which can vary based on environmental factors or shaver settings.