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Insufficient use of cutting
oil or unsuitable type of
oil
Incorrect speed selection.
Fill arbor with an oil of light
viscosity and check to be sure
oil is being metered into
cutter when pilot is
depressed.
If not, check
pilot groove and arbor
internally for dirt or apply oil
externally.
Even a small amount of oil is
very effective.
Select appropriate speed.
5) ) Excessive
cutter wear
Incorrectly re-sharpened
cutter.
Insufficient or spasmodic
cutting pressure
Refer to instructions and a
new cutter for proper tooth
geometry
Use sufficient steady pressure
to slow the drill down. This
will result in optimum cutting
speed and chip load.