Grizzly G9969 - Manual (Page 32)

-30-
G9969 Radial Drill Press
Symptom Possible Cause Possible Solution
Machine vibrates excessively or is
unusually noisy. 1. Motor or component is loose.
2. Belt is slapping belt cover.
3. V-belt is worn or is loose.
4. Motor fan is rubbing on fan cover.
5. Pulley is loose.
6. Machine is incorrectly mounted to
the workbench, or the workbench is
uneven.
7. Chuck or cutter is at fault.
9. Spindle bearings at fault.
8. Motor bearings are at fault.
1. Replace component fasteners and re-tighten
with thread locking fluid.
2. Replace, realign, or re-tension belt (refer to
Page 24).
3. Replace belt.
4. Replace/repair dented fan cover, and replace
loose or damaged fan.
5. Remove pulley, replace with key as required,
and re-install securely.
6. Make sure the mounting hardware is tight;
place shims under machine.
7. Replace out-of-round chuck, replace or
resharpen cutter, use appropriate feed rate
and cutting RPM.
8. Check bearings, replace motor or bearings
as required.
9. Replace bearings.
Symptom Possible Cause Possible Solution
Drilling stops, but the motor still
operates. 1. The belt is loose or worn.
2. The motor pulley is slipping on the
shaft.
3. Bit slips in chuck.
1. Replace or adjust the belt.
2. To resecure the pulley:
a. UNPLUG THE DRILL PRESS.
b. Remove set screw on slipping pulley.
c. Align flats on the pulley shaft with set screw
hole.
d. Reinstall and tighten the set screw.
3. Tighten bit; inspect bit for burrs or other
obstructions that might interfere with clamp-
ing surface.
The chuck wobbles or is loose on
the spindle shaft. 1. Foreign material is stuck between the
chuck-to-spindle mating surface.
2. Damaged chuck.
1. Remove the chuck and clean and de-burr the
tapered chuck and spindle mating surfaces,
then reassemble.
2. Replace chuck and arbor.
The spindle does not retract com-
pletely in the uppermost position
or it binds. 1. The quill shaft is gummy with sawdust
and oil.
2. The feed shaft return spring is weak.
3. The quill deflection screw is binding
the quill.
4. The return height nut is preventing the
quill from retracting fully.
1. Clean the gummy substance with penetrat-
ing oil and lubricate with a light coat of oil.
2. Increase the feed shaft return spring tension
as described on Page 31.
3. Loosen jam nut. Slightly turn out screw
where the quill binds, retighten jam nut and
recheck for binding.
4. Loosen return height nut.
The quill has excessive deflec-
tion. 1. The quill shaft is at fault.
2. The quill bearings are worn. 1. Adjust the quill screw.
2. Replace the quill bearings.
Holes drilled at an angle. 1. Headstock is not at 90 degrees. 1. Adjust headstock tilt (see Page 26).
Drill bit wobbles, holes are over-
sized. 1. Drill bit installed incorrectly. 1. Remove drill bit and reinstall.
Drill Press Operations