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Trouble or fault
The drive wheel / saw-
ing wire don't begin to
rotate.
The drive wheel slips /
the wire is not driven.
The wire jumps off the
drive wheel or guide
pulley when starting the
saw.
Very little or no sawing
progress.
Excessively high dia-
mond bead wear.
32
English
Possible cause
The sawing wire is used the
wrong way round (direction
of travel).
The diamond wire is too
slack.
The drive wheel is too badly
worn.
The return stop has not been
set.
The guide pulleys are not
aligned exactly.
The power drawn by the
machine is too low.
The length of cut or wire in
contact is too long.
Stiff movement of the car-
riage on the wire guidance
unit.
The wire beads are polished,
worn or poorly sharpened.
The advance pressure cylin-
der has reached the end po-
sition or the carriage is at the
end stop.
Cutting speed or, respec-
tively, wire drive speed is too
low.
Action to be taken
▶ Change the direction of
travel.
▶ Set the advance control
valve to "advance".
▶ Increase the initial tension
by increasing the pres-
sure.
▶ Set the cylinder back to
the end of stroke and the
carriage back to the end
stop.
▶ Check that the guide
carriage moves easily
along the rail. If necessary,
clean the guide surfaces,
rack and rollers.
▶ Replace the drive wheel.
▶ Push the return stop all the
way toward the cylinder
and clamp it securely.
▶ Align the guide pulleys
exactly with each other.
▶ Set up the saw to cut in a
tighter arc.
▶ Use a release pulley to
reduce the length of wire
in contact.
▶ Reduce cutting length /
divide the cut into several
individual sections.
▶ Check that the carriage
moves easily (smooth
movement ≤ 1 bar air
pressure) and clean the
guide surfaces, rack and
rollers if necessary.
▶ Sharpen the sawing wire.
▶ Replace the sawing wire.
▶ Reposition the end stop.
▶ Readjust the cylinder
and fit the wire storage
extension.
▶ Increase the cutting
speed, i.e. wire drive
speed.
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