Jet 891100, Operating Instructions And Parts Manual

21

EVBS-20

Machine will not start/restart or re-
peatedly trips circuit breaker or blows 
fuses (cont.)

Miswiring of the unit.

Double check to confi rm all electrical 
connections are correct. Refer to ap-
propriate wiring diagrams to make any 
needed corrections.

Switch failure.

If switch is suspect, you have two op-
tions: Have a qualifi ed electrician test 
the switch for function, or purchase a 
new start switch and establish if that 
was the problem on changeout.

Band Saw does not come up to speed.

Extension cord too light or too long.

Replace with adequate size and length 
cord.

Low current.

Contact a qualifi ed electrician.

15.3 WELDED BLADE INSPECTION

Table 3

Trouble

Probable Cause

Remedy

Weld is misaligned.

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 
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 ends properly before clamping.

Worn clamp jaws

Replace clamp jaws.

Clamp jaws not aligned correctly.

Align jaws correctly.

Misaligned weld: Blade ends are over-
lapped.

Pressure knob is set for wider blade 
than the one used.

Adjust pressure knob correctly for 
particular blade width.

Blade ends or clamp jaws not aligned 
correctly.

Make corrections as needed.

Weld breaks when used.

Weld is weak and incomplete; possible 
“blow holes” (see Figure 16).

Cut and re-weld blade ends.

Weld has been ground too thin.

Cut and re-weld blade ends.

Weld incorrectly annealed.

Follow annealing instructions in sec-
tion 12.4.

Incomplete weld.

Pressure knob not set correctly.

Make appropriate adjustment

Improper clamping procedures.

Use proper procedures. See section 
12.0.

Limit switch not adjusted correctly.

Adjust limit switch correctly.

Defective limit switch; doesn’t break 
circuit at end of welding operation.

Replace limit switch.

Clamp jaw movement obstructed by 
kinked jaw cable or tangled wires.

Bend cable and untangle wires.

Brittle weld.

Incorrect annealing heat.

Bring weld up to correct color. See 
section 12.4

Scale or oil on weld caused poor 
annealing.

Keep clamp jaws and blade clean.