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Troubleshooting
Trouble Probable Cause Remedy
Excessive vibration. Motor out of balance. Balance motor or replace.
Noisy Operation.
Improper quill adjustment. Adjust quill.
Dry spindle.
Lubricate spindle. See the Lubrication
section.
Noisy motor
Check motor bearings or for a loose
motor fan.
Motor Stalls.
Overfeeding. Reduce feed rate.
Dull drill bit. Sharpen drill bit.
Motor not running up to speed.
Replace or repair motor. Check fuses in
all three legs on three phase motors
and replace, if necessary.
Drill or tool heats up or
burns work.
Excessive speed. Reduce speed.
Dull tool. Sharpen tool or replace.
Feed rate too slow. Increase feed enough to clear chips.
Rotation of drill incorrect. Reverse motor rotation.
Failure to use cutting oil or coolant (on
steel).
Use cutting oil or coolant (on steel).
Drill leads off.
No drill spot. Center punch or center drill workpiece.
Cutting lips on drill off center. Re-grind drill.
Quill loose in head. Tighten quill.
Bearing play. Reseat or replace bearings.
Excessive drill runout
or wobble.
Bent drill. Replace drill.
Bearing play. Reseat or replace bearings.
Drill not seated properly in the chuck. Loosen, reset, and tighten chuck.
Work or fixture comes
loose or spins.
Failure to clamp work piece or work
holding device to table.
Clamp work piece or work holding
device to the table surface.