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Sharpening bits of different lengths and diameters, Problem – Drill Doctor 350X User Manual

Page 7

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Identifying Correctly Sharpened Drill Bits
(and what to do with those that aren’t!)

Correctly Sharpened Bits

Chisel Point

Cutting Edge

Heel

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 (positive relief).

Problem

The Chisel Edge
is ground flat.

Cause

Alignment Fingers did not
position the drill bit properly
in the aligning process (page
7-8).

Solution

Realign the bit by carefully fol-
lowing steps 1 through 3 on
page 7-8.

Cause

Too much drill bit is sticking out of
the end of the chuck.

Solution

Realign the bit. During the re-align-
ment process, be sure to keep the
White Triangle against the Cam
Guide as you insert the Chuck into
the Sharpening Port to set the depth
of the bit. The bit should be pushed
up inside the Chuck and should
rotate slightly as the Chuck is
plunged into the Sharpening Port
and contacts the Diamond Sharpen-
ing Wheel. Push until the Chuck is
fully inserted into the Port.

Problem

Surface of the
bit isn’t smooth
and/or heavy
grinding sound.

Problem

Heel same height or higher
than the cutting edge

Cause

Bit is misaligned or the Cam
failed to stay in contact with
the Cam Guide during sharp-
ening.

Solution

Carefully repeat the alignment
and sharpening procedure,
making sure to use light pres-
sure to keep the Cam in contact
with the Cam Guide during
sharpening.

Cutting Edge

Heel

Relief Angle

Problem

Cause

Too much pressure during
sharpening, dirty Chuck, or
Chuck not tightened enough.

Solution

Use just enough pressure to
keep the Cam in contact with
the Cam Guide. If the bit con-
tinues to slip, clean the Chuck
as described on Page 17.

Bit backing out or
slipping out of the
jaws when you are
sharpening

Sharpening Bits of Different
Lengths and Diameters

Drill Bits Of Different Sizes

Too many rotations of a small-diameter bit may result in
incorrect sharpening and too few on a large bit may not
sharpen enough.

3/32-inch bits

—use 2 to 4 half-turns,

1/8-inch bits

—use 4 to 6 half-turns,

3/8-inch bits

—use 16 to 20 half-turns.