- 17 -
11.2 -
Blade and cut diagnosis
FAULT
PROBABLE CAUSE
REMEDY
TOOTH BREAKAGE
Too
fast
advance
Wrong
cutting
speed
Wrong
tooth
pitch
Chips
sticking
onto
teeth
and
in
the
gullets
or
material
that
gums
Defects
on
the
material
or
material
too
hard
Ineffective
gripping
of
the
part
in
the
vise
The
blade
gets
stuck
in
the
material
Starting
cut
on
sharp
or
irregular
section
bars
Poor
quality
blade
Previously
broken
tooth
left
in
the
cut
Cutting
resumed
on
a groove
made
previously
Vibrations
Wrong
tooth
pitch
or
shape
Insufficient
lubricating,
refrigerant,
or
wrong
emulsion
Teeth
positioned
in
the
direction
opposite
the
cutting
direction.
Decrease
advance,
exerting
less
cutting
pressure.
Adjust
the
braking
device.
Change
speed
and/or
type
of
blade.
See
chapter
on
"Material classification
and blade selection",
in
the
section
Blade selection table according to
cutting and feed speed.
Choose
a suitable
blade.
See
Chapter
"Material classification and blade
selection".
Check
for
clogging
of
coolant
drain
holes
on
the
blade-guide
blocks
and
that flow
is
plentiful
in
order
to
facilitate
the removal
of
chips
from
the
blade.
Material
surfaces
can
be
oxidized
or
covered
with
impurities
making
them,
at
the beginning
of
the
cut,
harder
that
the
blade itself,
or
have
hardened
areas
or
inclusions
inside
the
section
due
to
productive
agents
used
such
as
casting
sand, welding
wastes, etc.
Avoid
cutting
these materials
or
in
a
situation a cut has to be made use
extreme
care,
cleaning
and
remove
any
such
impurities
as
quickly
as
possible.
Check
the
gripping
of
the
part.
Reduce
feed
and
exert
less
cutting
pressure.
Pay
more
attention
when
you
start
cutting.
Use
a superior
quality
blade.
Accurately
remove
all
the
parts
left
in.
Make
the
cut
elsewhere
,
turning
the
part.
Check
gripping
of
the
part.
Replace
blade
with
a more
suitable
one. See
"Material classification and
blade selection"
in
the
Blade Types
section. Adjust
blade
guide
pads.
Check
level
of
liquid
in
the
tank.
Increase the
flow
of
lubricating
refrigerant,
checking
that
the
hole
and
the
liquid
outlet
pipe are
not
blocked.
Check
the
emulsion
percentage.
Turn
teeth
to
correct
direction.
