Drill Press Operations - Grizzly G7943 Owner's Manual

Drill Press Operations

symptom
drilling stops, but the motor still oper-
ates.
the chuck wobbles or is loose on the
spindle shaft.
the spindle does not retract completely
in the uppermost position or it binds.
the quill has excessive deflection.
holes drilled at an angle.
drill bit wobbles, holes are oversized.
Model g7943/g7944 (Mfg. 10/02+)
possible Cause
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. Foreign material is stuck between the
chuck-to-spindle mating surface.
2. damaged chuck.
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. the quill shaft is at fault.
2. the quill and/or bearings are worn.
1. table is not at 90 degrees.
1. drill bit installed incorrectly.
possible solution
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.
1. remove the chuck and clean and de-
burr the tapered chuck and spindle
mating surfaces, then reassemble.
2. replace.
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 37.
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.
1. adjust the quill screw.
2. replace the quill and/or bearings.
1. adjust table angle (see Page 29).
2. remove drill bit and reinstall.
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