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22
12.0 Troubleshooting JWBS-14SFX Band Saw
12.1 Operational problems
Table 4
Symptom Probable Cause Correction
Table tilt does not hold
position under load.
Lock handle not tight. Tighten lock handle.
Trunnion locking mechanism is broken
or worn.
Replace trunnion locking mechanism.
Table will not tilt. Trunnion not lubricated. Lubricate trunnion.
Trunnion jammed. Disassemble and replace jammed
parts.
Table vibration while
sawing.
Band saw on uneven floor. Place machine on level surface; use
shims if needed.
Loose fasteners. Inspect and tighten screws, nuts, etc.
Drive belt too slack. Increase tension on drive belt. Replace
belt if worn.
Incorrect choice of saw blade pitch. Check blade selection chart and use
correct blade.
Saw dust or debris on band wheel. Or
tire is worn/damaged.
Keep band wheels clean. Replace tires
if necessary.
Surface finish on
workpiece is rough.
Blade pitch too coarse. Change to finer pitch blade.
Workpiece being fed too strongly. Reduce feed force.
Blade cutting
inaccurately. Cuts not
straight.
Gum or pitch on blade. Clean blade.
Worn blade teeth or damaged blade. Replace blade.
Fence not parallel to blade. Align fence properly.
Incorrect adjustment of blade guides. Adjust blade guides properly.
Workpiece being fed too strongly. Reduce feed force.
Upper blade guides not located close
enough to workpiece.
Position guides about 3/16” above
workpiece.
Incorrect choice of saw blade for that
particular operation.
Install correct blade.
Blade tension too light. Increase tension.
Blade cannot be
tensioned properly.
Tension spring is fatigued. Replace tension spring (contact JET
service representative).
Blade binds in
workpiece.
Incorrect blade tension or damaged
blade.
Correct accordingly.
Blade too wide for desired radius. Select narrower blade.
Blade forms cracks at
base of teeth.
Teeth not suitable for operation, or
incorrectly set.
Replace with proper blade.
Blade thickness not suitable for band
wheel diameter.
Replace with proper thickness blade.
Blade sharpened incorrectly, becomes
overheated.
Sharpen blade properly or replace.
Band wheels have become misaligned. Contact JET service representative.
Cracks on back edge
of blade.
Workpiece being fed too quickly. Reduce feed speed to lessen strain on
blade.
Welding on blade not perfectly aligned. Eliminate welded part, and re-weld
properly; or acquire a new blade. Round
(i.e. “stone”) the back edge of a new
blade.
Thrust bearing is worn; caused by
constant contact with back of blade.
Replace thrust bearing. Adjust new
bearing according to instructions.
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