28
Troubleshooting – Welded Blade Inspection
Trouble Probable
Cause
Remedy
Dirt or scale on clamp jaws or blade.
Always keep jaws clean. Clean blade
before welding.
Blade ends not square.
Before welding, grind cut edges of the
blade until they are square. Use the
shear on the band saw for square
cuts.
Blade ends not correctly aligned when
clamped in jaws.
Align the ends properly before
clamping.
Worn clamp jaws
Replace clamp jaws.
Weld is misaligned.
Clamp jaws not aligned correctly.
Align jaws correctly.
Pressure knob is set for wider blade
than the one used.
Adjust the pressure knob correctly for
particular blade width.
Misaligned weld:
Blade ends are
overlapped.
Blade ends or clamp jaws not aligned
correctly.
Make corrections as needed.
Weld is weak and incomplete;
possible “blow holes” (see Figure 19).
Cut and re-weld the blade ends.
Weld has been ground too thin.
Cut and re-weld the blade ends.
Weld breaks when
used.
Weld is not annealed correctly.
Follow annealing instructions on page
18.
Pressure knob not set correctly.
Make appropriate adjustment
Improper clamping procedures.
Follow instructions on pages 16
through 19.
Limit switch (#1, page 39) not
adjusted correctly.
Adjust limit switch correctly.
Defective limit switch; doesn’t break
circuit at end of welding operation.
Replace limit switch.
Incomplete weld.
Clamp jaw movement obstructed by
kinked jaw cable or tangled wires.
Bend cable and untangle wires.
Incorrect annealing heat.
Bring weld up to correct color (see
page 18).
Brittle weld.
Scale or oil on weld caused poor
annealing.
Keep clamp jaws and blade clean.
Summary of Contents for VBS-3612
Page 23: ...23 Speed and Pitch Chart ...
Page 24: ...24 Typical Band Saw Operations ...
Page 35: ...35 VBS 3612 Band Saw ...
Page 36: ...36 VBS 3612 Band Saw ...
Page 39: ...39 Welder Shear and Work Lamp Assemblies ...
Page 40: ...40 Electrical Connections 3Ph 230 460V ...
Page 42: ...42 Electrical Box see page 41 for identification of parts ...
Page 43: ...43 ...