Grizzly T33903 Owner's Manual page 42

Operation (Cont.)
Symptom Possible Cause
Bad surface 1. Spindle speed/feed rate too fast.
finish.
2. Dull or incorrect cutting tool/bit.
3. Workpiece not secure.
4. Spindle extended too far down during or at
beginning of operation.
Spindle 1. Machine operated at high speeds for
overheats.
extended period.
Spindle does 1. Poorly adjusted return spring.
not fully retract.
2. Debris on spindle/quill rack.
3. Worn return spring.
Drill bit drifts. 1. Dull/incorrectly sharpened drill bit.
2. Tool/bit/chuck incorrectly installed.
Drill bit slips in 1. Chuck jaws loose.
chuck or stuck
2. Workpiece squeezing drill bit.
in workpiece.
3. Feed rate too fast.
4. Spindle speed/feed rate to slow.
Workpiece 1. Workpiece not secure.
thrown from
2. Tool/bit too large for feed speed.
table.
Excessive 1. Debris on chuck, arbor, or in spindle taper.
runout or
wobbling in
chuck/drill bit.
2. Tool/bit bent.
3. Tool/bit installed incorrectly.
4. Spindle bearings worn.
-40-
Possible Solution
1. Reduce spindle speed (Page 29); reduce feed rate.
2. Sharpen cutting tool or select one that better suits
operation.
3. Properly clamp workpiece on table or in vise.
4. Fully retract spindle and raise table to increase rigidity.
1. Allow drill to cool.
1. Increase return spring tension (Page 41).
2. Clean and lubricate spindle/quill rack (Page 37).
3. Replace return spring.
1. Correctly sharpen drill bit.
2. Correctly install tool/bit (Page 30)/chuck
(Page 26).
1. Tighten chuck jaws.
2. Properly clamp workpiece on table or in vise.
3. Decrease feed rate.
4. Increase spindle speed (Page 29)/feed rate.
1. Properly clamp workpiece in table or in vise.
2. Use smaller tool/bit or decrease feed speed.
1. Remove chuck and arbor, clean chuck, arbor, and
spindle taper, then re-install (Page 26). Deburr
mating surfaces, if necessary.
2. Replace with straight tool/bit.
3. Install tool/bit correctly (Page 30) or replace.
4. Replace spindle bearings.
Model T33903/T33904 (Mfd. Since 07/23)