Stihl TSA 230 Manual De Instrucciones página 16

English
Avoid wedge action. The severed part
must not bind the abrasive wheel.
Be alert to potential movement of the
workpiece or anything else that could
cause the cut to close and pinch the
wheel. In order to reduce the risk of
pinching, 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 cutting technique that is not
subject to kickback.
Where there is a possibility of a pinch,
you can leave an uncut part that
prevents the kerf from closing and
pinching the wheel, which can later be
broken manually. If you are making a
complete cut, make sure that the final,
separating cut is made at the top of the
workpiece with the bottom of the wheel.
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 must therefore be
properly supported and must be secured
against pinching, rolling away, slipping
or vibrations.
14
Support an exposed pipe in a trench so
that it is stable and capable of bearing
weight. 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.
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. That section can also be
supported by means of a strap from
above, e.g., suspended from a backhoe.
It must be evenly supported and
properly tensioned, however, so that the
section remains in its position and does
not tend to go up or down as a whole or
on one side when separated.
Always pay attention in
subgrade/subsurface work areas –
supporting material can crumble or slide
away.
WARNING
Be particularly alert when cutting a
workpiece such as a pipe with a belled
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
not where you are actually cutting but,
rather, at or near the top of the
workpiece. If the pinch is in the upper
quadrant of the abrasive wheel,
kickback can result.
WARNING
Use wet-cutting whenever feasible,
since the water can act as a lubricant in
a pinch situation and thus reduce both
the likelihood of reactive forces
occurring and the energy of any such
forces that do occur, making it easier to
maintain control of the machine.
WARNING
Only STIHL branded cutting
attachments are recommended. Use of
certain non-STIHL branded wheels may
be extremely dangerous. Many
substandard diamond wheels, for
instance, are available in the market. If
they are not manufactured with the
proper quality steel in their core, if they
are not properly tensioned, or if other
design or manufacturing defects exist,
they may, e.g., begin to wobble during
use, lose segments or exhibit other
operational problems that can
substantially increase the risk of
personal injury or death. If a diamond
wheel begins or ceases to wobble within
the kerf, the change in the behavior of
the wheel may cause a severe binding
TSA 230