Stihl TS 440 Instruction Manual page 24

English
appropriate Assigned Protection Factor.
If you are unable to determine the water
flow rate, to reduce the risk of serious or
fatal respiratory illness or cancer the
operator and any bystanders should
always wear a properly rated, NIOSH-
approved respirator with an Assigned
Protection Factor sufficient to provide
the level of respiratory protection
needed for worksite- specific conditions.
Points to be noted with diamond and
composite cutting wheels
Object to be cut
Must be fully supported
–
Must be secured so that it cannot
–
roll or slip away
Must be protected against vibration
–
and movement
The cutting sequence
There are many ways to cut materials
and objects with a cut-off machine and
the operator and/or his supervisor, with
knowledge of the job site conditions and
requirements, always must exercise
good judgment and discretion in
determining how to safely complete a
cutting task. The methods described in
the following sections, while constituting
proven techniques, are illustrative only
and are not meant to substitute for the
judgment of the experienced workmen
with direct knowledge of on-site
conditions.
However, the cutting sequence is
important. The last cut must always be
made in such a way that the cutting
wheel cannot become pinched, bound
or clamped and so that the operator, co-
22
workers and bystanders are not at risk of
being injured by a falling part that has
been cut off or out, or by cutting debris or
sparks.
Leave small sections of uncut material to
hold the part being severed in position.
These sections can later be broken
through manually, using a hammer or
other appropriate tool. Always continue
to wear appropriate eye protection when
finishing a cut by breaking it manually.
A number of points must be decided
before the part is finally severed:
How heavy is the part?
–
In which direction can it move or fall
–
after being severed?
Is it under tension?
–
Is it properly supported to prevent
–
pinching or binding of the wheel?
The operator, co-workers and
bystanders must not be put at risk of
injury when the part is broken off or falls.
Cutting in several passes
Mark cutting line (A).
N
Work along the cutting line. If
N
corrections are necessary, always
lift the machine and reposition the
cutting wheel, taking care to ensure
that it is not wedged, tilted, twisted
or side loaded. Attempting to
change the position or direction of a
cut while the wheel is in the cut can
bind the wheel. This can lead to
kickback, other reactive forces or a
shattered composite cutting wheel,
which could result in severe or fatal
personal injury.The cutting depth
per pass should not exceed 2" to
2 1/2" (5 to 6 cm). Thicker material
must be cut in several passes. The
maximum cutting depth for abrasive
cutting wheels with a 14" diameter is
4.9 in. (125 mm).
Cutting slabs
Secure the slab (e. g. on a non-slip
N
surface, sandbed) and mark the
cutting line.
TS 440