Chamfer
From Wikipedia, the free encyclopedia
http://en.wikipedia.org/wiki/Chamfer
A chamfer is a beveled edge connecting two surfaces. If the surfaces are at right
angles, the chamfer will typically be symmetrical at 45
degrees. A fillet
is the rounding off of an interior corner. A rounding of
an exterior corner is called a "round"
or a "radius".
"Chamfer" is a term commonly used in industrial
engineering. Special tools such as chamfer
mills and chamfer planes are available. In tile work, or furniture such as
counters or table tops, an edge or arris
that has been eased by rounding instead of chamfering is
called a bullnose.
Where a chamfer does not go to the end of the piece, but
"lifts out" in a smooth curve, the end is called
a lark's tongue.
Countersink
From Wikipedia, the free
encyclopedia
http://en.wikipedia.org/wiki/Countersink
A countersink is a conical hole cut into a manufactured
object, or the cutter used to cut such a hole. A common
usage 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 hex-headed capscrew.) 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 endmills (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).
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5/32"
Drill Bit