Description
An annular cutter is a type of cutter that has a hollow interior, which eliminates the dead zone resistance that can be encountered with twist drills. This allows for faster cutting and less chatter, as well as a longer tool life and less scrap.
Annular Cutters 55mm long
Annular Cutter: * 42
mm
One
way to avoid dimpling and deburring while making holes in tube and pipe is to use
annular cutters. Because annular cutters are hollow on the inside; there is no dead-zone
resistance to overcome.
Using a twist drill to make holes in pipe or tubing can prompt concerns about
the hole roundness; location accuracy; hole finish; chip extraction; burrs; and
drilling duration.
The focal point of these concerns is the twist drills most noticeable feature;
its point. This is not really a point at all; but the tangent line where two cutting
angles intersect at the web of the drill; or the so-called dead zone. This dead
zone causes the surface speed of the cutting edges to drop to zero.
The lower surface speed reduces cutting efficiency and requires increased thrust;
or feed pressure; for the cutting edges to push through the material.
Compared to traditional tooling (twist drills; etc.) annular cutters can multiply
your cutting speed by up to 3 times while getting a longer tool life; a more accurate
hole; a better finish; with no burrs. The cutting edges distribute the cutting load
evenly; thus making it faster cutting.
Annular cutters convert a smaller area to chips; requiring less horsepower and
thrust. This feature provides longer tool life and less chatter. The slug also offers
a higher scrap value than loose chips and shavings.
Refer to the picture shown below; explaining why annular cutters are more efficient
and faster than twist drill bits.
Definition Annular
Ring-shaped or forming a ring. From the latin word annulus
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