Stihl TS 440 Manual De Instrucciones página 19

Be alert to potential movement of the
workpiece or anything else that could
cause the cut to close and pinch, bind or
clamp the wheel. In order to reduce the
risk of pinching, binding or clamping,
support the workpiece in such a way that
the cut remains open during the cutting
process and when the cut is finished
(see illustration). Never make a cut that
results in a binding of the wheel. If you
cannot properly support the workpiece,
do not use a cutting-off machine to make
the cut; select another tool or method.
Where there is a possibility of a pinch,
you should leave an uncut portion of the
workpiece that prevents the cut from
closing and pinching the wheel, which
can later be broken manually using a
hammer or other appropriate tool. If you
are making a complete cut, make sure
that the final, separating cut is made at
the top of the workpiece using the
bottom of the wheel, with the guard of
the machine pushed fully forward to the
forward stop position. In this way, if there
is any residual pinching, it will be at the
bottom of the wheel, where it may result
in pull-away, but not in kickback. Be alert
for pull-away.
Objects to be cut always must be
properly supported and must be secured
against pinching, rolling away, slipping
or vibration.
TS 440
Support an exposed pipe in a trench so
that it is stable and will not "sag" or
"drop." If the ends of the pipe are firmly
in the ground, the ground may act as a
support where the pipe emerges into the
open. Additional support will be needed
closer to the cut, however, to prevent
sagging (see illustration).
Be alert for pipe that is under stress that
may cause it to shift when cut; pipe in the
ground may be under stress because of
uneven pipe bed surfaces. The release
of stress or tension in the pipe can
propel the cut-off machine, causing loss
of control and resulting in severe
personal injury or death. It also can
cause a binding or pinching of the
abrasive cutting wheel, which could
result in reactive forces, including
kickback.
Make sure any section of pipe to be
removed is also properly supported and
will not shift. After the first cut, you may
need to move the supports or add
additional support for the second cut so
that both sides of that cut are fully
supported, including the section to be
removed.
Always pay attention in
subgrade/subsurface work areas
supporting material can crumble or slide
away, causing the pipe to sag and pinch
the wheel.
WARNING
Be particularly alert when cutting a
workpiece such as a pipe with a bell end
or when cutting out a section of pipe in a
trench that, if not properly supported,
can sag or drop upon completion of the
cut, creating a pinch or bind. Without
proper support, a pipe with a bell end
laying on the ground will tend to create a
ramp effect that will cause the pipe to
sag or drop as the pipe is cut. If the pinch
or bind occurs in the upper quadrant of
the abrasive cutting wheel, kickback can
result.
WARNING
Use wet-cutting whenever feasible.
Water can act as a lubricant in a pinch
situation and can reduce both the
likelihood of reactive forces occurring
and the energy of any such forces if they
do occur, making it easier to maintain
control of the machine. Please note,
however, that wet cutting should not be
used with composite wheels on the
TS 440.
WARNING
Only STIHL branded cutting
attachments are recommended. Use of
certain non-STIHL branded wheels may
be extremely dangerous. Many
substandard diamond cutting wheels
are available in the market. If they are
not manufactured with the proper quality
materials in their core, if they are not
properly hardened or tensioned, or if
other design or manufacturing problems
exist, they may begin to wobble during
use, lose segments or exhibit other
operational problems that can
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