0 troubleshooting the j-7020/7040 band saws – Jet Tools J-7040 User Manual
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13.0 Troubleshooting the J-7020/7040 Band Saws
Symptom Possible
Cause
Correction
Excessive blade
breakage
Material loose in vise.
Clamp work securely.
Incorrect speed or feed.
Check machinist’s handbook for
speed/feed appropriate for the material
being cut.
Teeth too coarse for material.
Check machinist’s handbook for
recommended blade type.
Incorrect blade tension.
Adjust blade tension to the point where the
blade just does not slip on the wheel.
Saw blade is in contact with
workpiece before the saw is started.
Start the motor before placing the saw on
the workpiece.
Blade rubs on the wheel flange.
Adjust blade tracking.
Misaligned guides.
Adjust guides.
Cracking at weld.
Longer annealing cycle.
Premature blade
dulling
Blade teeth too coarse.
Use a finer tooth blade.
Blade speed too high.
Try a lower blade speed.
Inadequate feed pressure.
Decrease spring tension.
Hard spots in workpiece or scale
on/in workpiece.
Increase feed pressure (hard spots).
Reduce speed, increase feed pressure
(scale).
Work hardening of material
(especially stainless steel).
Increase feed pressure by reducing spring
tension.
Insufficient blade tension.
Increase tension to proper level.
Operating saw without pressure on
workpiece.
Do not run blade at idle in/on material.
Bad cuts
(out-of-square)
Workpiece not square with blade.
Adjust vise so it is square with the blade.
(Always clamp work tightly in vise.)
Feed pressure too fast.
Decrease pressure.
Guide bearings not adjusted
properly.
Adjust guide bearing clearance to 0.001
inch (0.002 inch maximum).
Inadequate blade tension.
Gradually increase blade tension.
Span between the two blade guides
too wide.
Move blade guide bar closer to work.
Dull blade.
Replace blade.
Incorrect blade speed.
Check blade speed.
Blade guide assembly is loose.
Tighten blade guide assembly.
Blade guide bearing assembly loose.
Tighten blade guide bearing assembly.
Blade tracks too far away from wheel
flanges.
Adjust blade tracking.
Guide bearing worn.
Replace worn bearing.
Bad cuts (rough)
Blade speed too high for feed
pressure.
Reduce blade speed and feed pressure.
Blade is too coarse.
Replace with finer blade.
Blade is twisting
Blade is binding in the cut.
Decrease feed pressure.
Blade tension too high.
Decrease tension on blade.