Split-point drills have several advantages over coventionally ground points.

The s-p is far less likely to wander or skate when starting a hole.. because
there's no web preventing the cutting edges from cotacting the workpiece.

The s-p requires less feed pressure because there's no web, the chisel edge
of the web of coventional points has to continuously be forced into the
workpiece to displace material.. essentially "wallowing out" a path for the
web.

Since the s-p is constantly cutting, faster feed rates can be attained.

Split points aren't difficult to grind. The don't require a special,
precision gash cut into the center.. instead, they're ground by removing
material from the back/trailing side of each land, then the usual crowned
grind is added.
The second/crowned grinds can also be flat, creating a 4-factet split-point.

--
WB
..........


"F. George McDuffee" wrote in message
...
On Sun, 29 Dec 2013 02:16:00 -0500, "Wild_Bill"
wrote:

snip
Split-point drills begin to cut immediately upon contact with the
workpiece,
whereas conventionally ground drills require feed pressure to force the
drill's web into the workpiece.
snip

Good point and one I hadn't thought of. Thanks for the
insight.


--
Unka' George

"Gold is the money of kings,
silver is the money of gentlemen,
barter is the money of peasants,
but debt is the money of slaves"

-Norm Franz, "Money and Wealth in the New Millenium"