
10. Troubleshooting
Problem
Cause
Remedy
Noisy operation
1. Incorrect belt tension
1. Adjust tension
2. Dry spindle
2. Lubricate spindle
3. Loose spindle pulley
3. Check tightness of retaining nut on pulley and tighten
if necessary
4. Loose motor pulley
4. Tighten set screws in pulleys
Drill bit burns
1. Incorrect speed
1. Change speed
2. Chips not coming out of hole
2. Retract drill bit frequently to clear chips
3. Dull drill bit
3. Resharpen or change the drill bit
4. Feeding too slow
4. Change speed
5. Not lubricated
5. Lubricate drill bit
Drill bit wanders off centre
1. Hard grain in wood
1. Resharpen drill bit correctly
or hole not circular
2. Lengths of cutting lips and/or angles not equal
2. Resharpen drill bit correctly
3. Bent drill bit
3. Replace drill bit
Wood splinters on underside
No sacrificial material under workpiece
Use sacrificial material
Workpiece turns loose
1. Not supported or clamped properly
1. Support workpiece or clamp it in vice
Drill bit binds in workpiece
1. Workpiece pinching drill bit
1. Support workpiece or clamp it
2. Excessive feed pressure
2. Reduce feed pressure
3. Improper belt tension
3. Adjust tension.
Excessive drill bit run out or wobble
1. Bent drill bit
1. Replace drill bit
2. Worn spindle bearings
2. Replace bearings
3. Drill bit not properly installed in chuck
3. Install drill bit properly
4. Chuck not properly installed
4. Install chuck properly
Quill returns too slowly or too quickly
Spring has improper tension
Adjust spring tension see Maintenance & Operation
Chuck will not stay attached to spindle,
Dirt, grease or oil on the tapered inside surface
Using a household detergent, clean the tapered
it falls off when trying to install
of chuck or on the tapered surface of the spindle
surface of the chuck and spindle to remove all
dirt, grease and oil
Summary of Contents for DP25B
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