Thomas SAR 460 SA G DIGIT, Use And Maintenance Manual

Page: 39 / 42

39
SAR 460 SA G
FAULT PROBABLE CAUSE REMEDY
Check distance between pads (see
Chapter “Machine adjustments” in the
Blade Guide blocks section): extremely
accurate guiding may cause cracks and
breakage of the tooth. Clean carefully.
Check that on the blade tightening pres-
sure gauge reads 22 BAR, yhe ideal tight-
ening value.
Approach head as near as possible to
material to be cut so that only the blade
section employed in the cut is free, this
will prevent deflections that would exces-
sively stress the blade.
The back of blade rubs against the sup-
port due to deformed or poorly welded
bands (tapered), causing cracks and
swelling of the back contour.
Check level of liquid in the tank. Increase
the flow of lubricating refrigerant, check-
ing that the hole and the liquid outlet pipe
are not blocked. Check the emulsion per-
centage.
Replace them.
Adjust them (see Chapter “Machine ad-
justments” in
Blade guide blocks section).
Check fastenings of the blade guide
heads as to the counter-vice so that they
are not too loose and adjust heads verti-
cally; bring into line the position of the
degrees and if necessary adjust the stop
screws of the degree cuts.
Check and vertically re-adjust the blade
guide blocks; reset proper side guide play
(see Chapter “Machine adjustments” in
Blade guide blocks section).
Decrease advance, exerting less cutting
pressure. Adjust the braking device if
mounted on the machine.
Approach head as near as possible to
material to be cut so that only the blade
section employed in the cut is free, this
will prevent deflections that would exces-
sively stress the blade.
Check that the tightening pressure gauge
reads 22 BAR, the ideal tightening value.
Replace it.
Blade used probably has too large teeth;
use one with more teeth (see Chapter
“Material classification and blade se-
lection” in the
Selecting blade section).
Blade guide pads not regulated or
dirty because of lack of maintenance
Blade too slack
Blade guide block too far from mate-
rial to be cut
Improper position of blade on fly-
wheels
Insufficient lubricating refrigerant or
wrong emulsion
Damaged or chipped blade guide
pads
Tight or slackened blade guide pads
Blade not parallel as to the counter-
vice
Blade not perpendicular due to the
excessive play between the guide
bearings and maladjustment of the
heads
Too fast advance
Blade guide block too far from mate-
rial to be cut
Blade too slack
Worn out blade
Wrong tooth pitch
STREAKED OR ETCHED BANDS
CUTS OFF THE STRAIGHT