The basic geometry of a countersink (cutter) inherently can be applied to the plunging applications described above (axial feed only) and also to other milling applications (sideways traversal).
Countersink cutters are manufactured with six common angles, which are 60, 82, 90, 100, 110, or 120, with the two most common of those being 82 and 90.
Building a ramp for skateboards involves drilling countersink holes, radius curves, cross struts and cutting 2-metre lengths of angle iron (no, me neither).
