Jet VBS-3612 Operating Instructions And Parts Manual page 28

Troubleshooting – Welded Blade Inspection
Trouble
Weld is misaligned.
Misaligned weld:
Blade ends are
overlapped.
Weld breaks when
used.
Incomplete weld.
Brittle weld.
Probable Cause
Dirt or scale on clamp jaws or blade.
Blade ends not square.
Blade ends not correctly aligned when
clamped in jaws.
Worn clamp jaws
Clamp jaws not aligned correctly.
Pressure knob is set for wider blade
than the one used.
Blade ends or clamp jaws not aligned
correctly.
Weld is weak and incomplete;
possible "blow holes" (see Figure 19).
Weld has been ground too thin.
Weld is not annealed correctly.
Pressure knob not set correctly.
Improper clamping procedures.
Limit switch (#1, page 39) not
adjusted correctly.
Defective limit switch; doesn't break
circuit at end of welding operation.
Clamp jaw movement obstructed by
kinked jaw cable or tangled wires.
Incorrect annealing heat.
Scale or oil on weld caused poor
annealing.
Remedy
Always keep jaws clean. Clean blade
before welding.
Before welding, grind cut edges of the
blade until they are square. Use the
shear on the band saw for square
cuts.
Align the ends properly before
clamping.
Replace clamp jaws.
Align jaws correctly.
Adjust the pressure knob correctly for
particular blade width.
Make corrections as needed.
Cut and re-weld the blade ends.
Cut and re-weld the blade ends.
Follow annealing instructions on page
18.
Make appropriate adjustment
Follow instructions on pages 16
through 19.
Adjust limit switch correctly.
Replace limit switch.
Bend cable and untangle wires.
Bring weld up to correct color (see
page 18).
Keep clamp jaws and blade clean.
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