Identifying Correctly Sharpened Drill Bits; Split Points - DRILL DOCTOR 750X Guia Del Usuario

Identifying Correctly Sharpened
Drill Bits (and what to do with
those that aren't!)
Correctly Sharpened Bits
Chisel Point
Heel
Cutting Edge
Incorrectly Sharpened Bits
Problem
The Chisel Edge
is ground flat.
Cause
Problem
The bit isn't completely ground yet.
The Chisel Edge is
not clean or
Solution
straight.
Continue sharpening the bit until
the chisel is clean and straight. If
the machine quits removing mate-
rial before the chisel is clean, re-
align and sharpen again. (Model
750X users can increase or
decrease MTO (material take-off)
to speed up this process.
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The entire surface from the
Cutting Edge to the Heel will
have a finely ground surface
without ridges or indenta-
tions. The Heel will always
be lower than the Cutting
Edge. The Chisel Edge will be
clean and straight.
Cause
Chuck Jaws did not grip drill
bit properly in the aligning
process (Page 8).
Solution
Realign the bit by carefully
following steps 1 through 5
on Pages 8 to 10.
www.drilldoctor.com
Problem
Insuffecient (Negative)
relief or a slow cutting
drill bit.
Cutting Edge
Heel
Relief Angle
Problem
Bit backing out or
slipping out of the
jaws when you are
sharpening

Split Points

Split point drill bits prevent walk-around on the material
before they begin to cut.
This feature is described as self-centering. The need to
center punch is effectively eliminated. A standard drill bit
chisel point has to wear an area in the middle of the hole
to be drilled before the cutting edges will remove material.
Due to its additional cutting lips along the chisel edge, a
split point will begin cutting immediately. Up to 70% less
thrust (when compared to a non-split or conventional
point) is required to drill a hole with a split point.
www.drilldoctor.com
Cause
Drill bit alignment.
Solution
Re-align the drill using the
Adjustable Alignment proce-
dure on page 19. To increase
relief, insert the alignment
guide on the chuck closer to
the (+) side of the alignment
port, then sharpen the bit.
Cause
Chuck too loose or too much
pressure when sharpening.
Solution
Use more torque when tight-
ening the Chuck or less pres-
sure when sharpening. Clean
the Chuck w/ compressed air
if the problem persists.
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