| Breakers |
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Chipping hammers weighing
between 3-5 kilos are suitable for light chipping
work, trimming and finishing, making holes and
channels in concrete floors and walls, and other
tasks.
The larger sizes, up to 40 kilos are suitable for
heavier tasks such as concrete demolition, tamping,
breaking up frozen ground, asphalt breaking, driving
piles and digging trenches. |
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Drills |
|
Hand held rock drills are
suitable for light bench drilling, secondary rock
drilling, plug drilling and drilling for smoth
blasting. For maximum effect, the rock drill chosen
should be determined by two factors:
- The diameter and
depth of the hole required. The deeper the hole,
the larger the drill and bit.
- The type of material
to be drilled, granite or soft rock requires a
larger diameter drill hole.
Ergonomically designed
rock drills have high impact energy in relation to
weight and are far less tiring to work with. |
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| When using breakers and
drills, choose T-handle machines for vertical jobs.
D-handle tools should only be used for jobs where
the machine is held in a horizontal position. |
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Working tool selection |
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When selecting a steel,
it is important to choose the correct shape as well
as the correct dimension.
Shanks come in a number of different shapes.
The illustration shows some typical examples.
Use only steels and drills with shanks of the
correct shape for the machine. |
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Cutting and compacting asphalt |
|
| Asphalt cutters have a
sligthly curved edge which gives more concentrated
energy for starting each cut. When working with soft
asphalt, a wider cutter will help avoid cutting too
deeply and eliminate the risk of sticking. |
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| When starting, run the
breaker at idling speed and make a score by holding
the machine at an angle. If the steel get stuck, try
small sideways movements to release it. If it
doesnīt work, use another steel to free it. Donīt
take too big a bite and donīt overpenetrate. |
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| Using the tamper, compact
the base thoroughly. |
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| Start at the edges when
packing new asphalt, the result will be a lasting
seal. Compact the rest of the material and level
off. |
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Concrete breaking |
|
| When breaking concrete,
work to a clear edge whenever possible. Using the
widest tool the material will allow, makes the job
go faster. |
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| To make an opening in a
concrete wall, mark the outline of the hole. Drill
some holes in the middle. Then break out the
material. |
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Drilling |
|
Atlas Copco offers an
extensive range of drills for different materials
and jobs. Avoid making a wider hole than necessary.
Choosing the correct drill saves both time and
energy.
Integral drill steels are grouped in series. When
drilling a deep hole start with a short wide drill
and continue successively using the next size down.
This avoids jamming and allows extra extraction.
|
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a) Button bits are
most suitable for drilling large holes in concrete
or soft rock.
b) The pilot drill is useful for an accurate
start and for drilling large diameter shallow holes.
c) Integral drills steels are the best choice
for harved materials. |
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| To get maximum effect,
tools should be kept sharp and their shanks must
have the correct dimensions. |
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| Tools should be reground
to the shape shown. |
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| Donīt forget to check the
flushing air hole. |
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| When collaring a hole,
start drilling at reduced throttle and guide the
drill steel with your feet. |
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| Under no circumstances
should you grip the centre carrying handle when
adjusting the throttle on drilling machines. If you
do and the drill jams, it could result in a wrist or
hand injury. |
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| The tools should be
centered at all times allowing it to rotate freely
in the hole. If the rotation becomes sluggish, or
if the drill keeps sticking, lift the machine a few
times to improve flushing. |
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| Always try to regulate
the feed pressure and rotation according to the
material you are working with. Never let the drill
jump freely on the shank. If the tool gets stuck,
stop the machine and free it with a drill wrench or
spanner. |
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| Drill dust in camp rock
can cause the drill to stick. Pouring more water into
the hole dissolves the sludge and frees the drill. |
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| A dust collector in the
form of a suction hood around the hole protects both
machine and operator from dust particles. |
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