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4.
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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Check the tip of the bit
carefully to determine that
both sides of the bit are split
equally. Compare it to this
illustration. If it does not
match, study the information
below.
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 Hole
again and split both sides.
Push the Chuck into the Hole
until it stops. Repeat until the
split sides are equal and look
like the correctly split bit
shown above.
Solution
After splitting, do not remove
the bit from the Chuck.
Reinsert the chucked bit into
the Sharpening Hole and
remove enough of the tip
until the split tip looks like the
correctly split bit above.
11
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