Troubleshooting Vbs-18Mwevs Band Saw; Operational Problems - Jet VBS-18MWEVS Operating Instructions And Parts Manual

16.0 Troubleshooting VBS-18MWEVS Band Saw

16.1 Operational problems

Symptom
Table tilt does not hold
position under load.
Table will not tilt.
Table vibration while
sawing.
Surface finish on
workpiece is rough.
Blade cutting
inaccurately. Cuts not
straight.
Blade cannot be
tensioned properly.
Blade binds in
workpiece.
Blade forms cracks at
base of teeth.
Cracks on back edge
of blade.
Probable Cause
Lock handle not tight.
Trunnion locking mechanism is broken
or worn.
Trunnion not lubricated.
Trunnion jammed.
Drive belt too slack.
Incorrect choice of saw blade pitch.
Saw dust or debris on band wheel. Or
tire is worn/damaged.
Blade pitch too coarse.
Workpiece being fed too strongly.
Gum or pitch on blade.
Worn blade teeth or damaged blade.
Fence not parallel to blade.
Incorrect adjustment of blade guides.
Workpiece being fed too strongly.
Upper blade guides not located close
enough to workpiece.
Incorrect choice of saw blade for that
particular operation.
Blade tension too light.
Tension spring is fatigued.
Incorrect blade tension or damaged
blade.
Blade too wide for desired radius.
Teeth not suitable for operation, or
incorrectly set.
Blade thickness not suitable for band
wheel diameter.
Blade sharpened incorrectly, becomes
overheated.
Band wheels have become misaligned.
Workpiece being fed too quickly.
Welding on blade not perfectly aligned.
Thrust bearing is worn; caused by
constant contact with back of blade.
Feed force too great.
Table 5
Correction *
Tighten lock handle.
Replace trunnion locking mechanism.
Lubricate trunnion.
Disassemble and replace jammed
parts.
Increase tension on drive belt. Replace
belt if worn.
Check blade selection chart and use
correct blade.
Keep band wheels clean. Replace tires
if necessary.
Change to finer pitch blade.
Reduce feed force.
Clean blade.
Replace blade.
Align fence properly.
Adjust blade guides properly.
Reduce feed force.
Position guides about 1/8" above
workpiece.
Install correct blade.
Increase tension.
Replace tension spring (contact JET
service representative).
Correct accordingly.
Select narrower blade.
Replace with proper blade.
Replace with proper thickness blade.
Sharpen blade properly or replace.
Contact service representative.
Reduce feed speed to lessen strain on
blade.
Eliminate welded part, and re-weld
properly; or acquire a new blade. Round
the back edge of a new blade.
Replace thrust bearing. Adjust new
bearing according to instructions.
Reduce feed force.
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