Wiggler (tool)

On the other end, a cone shape is also spring-loaded and is used to locate the center of a previously drilled hole.

It is battery-operated and works by lighting up its internal LED (usually red) when the electrical circuit formed by the instrument, the workpiece and the machine is closed.

The light is thus illuminated when the edge finder is touching the workpiece and is visible through openings in the case.

In contrast to the edge finder, in the mechanical versions, the tip is not spring-loaded, and it works with the spindle stopped.

In contrast to the edge finder, it most often requires no calculation, measurements or layout method markings to allow this alignment.