Grizzly G7944 Owner's Manual page 39

Drill Press Operations
Symptom Possible Cause
Tool loose/lack of 1. Tool incorrectly installed in spindle taper.
power in spindle.
2. Debris on tool or spindle taper mating
surfaces.
3. Taking too big of a cut.
4. V-belts are loose.
5. Wrong voltage.
Workpiece or tool 1. Table locks not tight.
vibrates or chatters
2. Workpiece not secure.
during operation.
3. Spindle speed/feed rate is too fast.
4. Spindle or quill extended too far down.
Headstock is hard to 1. Headstock lock nuts at fault.
raise.
2. Rack and pinion at fault or jammed with
grime/debris.
Bad surface finish. 1. Spindle speed too fast for workpiece
material.
2. Dull or incorrect cutting tool.
3. Wrong rotation direction of cutting tool.
4. Workpiece not secure.
5. Spindle extended too far down during
operation.
Spindle overheats. 1. Drill operated at high speeds for extended
period.
Spindle does not 1. Poorly adjusted return spring.
return to highest
2. Worn return spring.
position.
Depth stop pro- 1. Depth stop not calibrated.
ducing inaccurate
results.
Model G7943/G7944 (Mfd. Since 09/17)
Possible Solution
1. Remove and re-install (Page 32).
2. Clean tool and spindle taper.
3. Lessen depth of cut and allow chips to clear
(Page 29).
4. Properly tension V-belts (Page 28).
5. Correct voltage.
1. Tighten table locks (Page 31).
2. Properly clamp workpiece on table or in vise.
3. Set spindle speed correctly (Page 28) or use
slower feed rate.
4. Fully retract spindle and lower headstock. This
increases rigidity to decrease vibration.
1. Loosen/replace lock nuts.
2. Fix/replace broken or loose parts; clean and
lubricate rack and pinion.
1. Set spindle speed correctly (Page 28).
2. Sharpen cutting tool or select one that better suits
the operation.
3. Check for proper cutting tool rotation.
4. Properly clamp workpiece on table or in vise.
5. Fully retract spindle and lower headstock. This
increases rigidity.
1. Allow drill to cool.
1. Increase return spring tension (Page 38).
2. Replace return spring.
1. Calibrate depth stop (Page 38).
-37-