A countersink is a conical hole cut
into a manufactured object, or the cutter used to cut such a hole. A common use
is to allow the head of a countersunk bolt or screw, when placed in the hole,
to sit flush with or below the surface of the surrounding material (by
comparison, a counterbore
makes a flat-bottomed hole that might be used with a socket-head cap screw).
A countersink may also be used to remove the burr left from a
drilling or tapping
operation thereby improving the finish of the product and removing any
hazardous sharp edges.
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). Therefore countersinks
overlap in form, function, and sometimes name with chamfering end mills (endmills with
angled tips). Regardless of the name given to the cutter, the surface being
generated may be a conical chamfer (plunging applications) or a beveled corner
for the intersection of two planes (traversing applications).
Baggio WANG FAN
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