Identifying Correctly Split Bits - DRILL DOCTOR 750X Mode D'emploi

Identifying Correctly Split Drill Bits
(And What to Do With Those That Aren't!)
Correctly Split
Split line
Undersplit
Split lines do not meet in
the center but Chisel
Edge remains.
Not enough material has
been removed from the
Heel of the drill bit.
Oversplit
Too much material
removed. Split lines are
joined in the center and
Chisel Edge has been
removed.
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Split lines are nearly straight
across.
Solution
More grinding is needed for
larger drill bits. If one side of
the bit is undersplit, insert
the Chuck into the Splitting
Port again and split both
sides. Push the Chuck into
the Port until it stops. Repeat
until the split sides are equal
and look like the correctly
split bit shown above.
Solution
Reinsert the chucked bit into
the Sharpening Port and
remove enough of the tip
until the split tip looks like
the correctly split bit above.
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