Grizzly G7947 - Manual (Page 39)

G7947/G7948 12 Speed Floor Drill Press
-37-
Symptom Possible Cause Possible Solution
Drilling stops, but the motor still oper-
ates. 1. The belt is loose or worn.
2. The pulley for the spindle shaft or the
motor is slipping on the shaft.
3. Bit slips in chuck.
1. Replace and/or adjust the belt.
2. To resecure the pulley, do these
steps:
a. UNPLUG THE DRILL PRESS.
b. Remove the setscrew on the slipping
pulley.
c. Align the flats on the pulley shaft with
the setscrew hole.
d. Reinstall and tighten the setscrew.
3. Tighten bit; inspect bit for burrs or other
obstructions that might interfere with
clamping 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.
The spindle does not retract completely
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.
1. Clean the gummy substance with pen-
etrating oil and lubricate with a light
coat of oil.
2. Increase the feed shaft return spring
tension as described on Page 38.
3. Loosen the jam nut, and slightly turn
out the screw where the quill binds.
Retighten the jam nut and recheck for
binding and looseness at all spindle
locations.
The quill has excessive deflection. 1. The quill shaft is at fault.
2. The quill and/or bearings are worn.
1. Adjust the quill screw.
2. Replace the quill and/or bearings.
Holes drilled at an angle. 1. Table is not at 90 degrees. 1. Adjust table angle (see Page 30).
Drill bit wobbles, holes are oversized. 1. Drill bit installed incorrectly. 2. Remove drill bit and reinstall.
Drill Press Operations