Pressure Adjustment; Air Pressure; Calibrate The Correct Air Pressure; Drill Steel - Atlas Copco BBD 12 Sicherheits- Und Betriebsanleitung

Safety and operating instructions

Pressure adjustment

Air pressure

Ensure that the compressor can deliver the required
air pressure of 4–6 bar to the tool.
1. High pressure causes rough operation and
excessive wear.
2. Low pressure results in a slow drilling speed.

Calibrate the correct air pressure

Use the Atlas Copco (9090 0550 80) pressure gauge
to check the air pressure when the rock drill is
running. The pressure should be measured close to
the inlet nipple. Maximum allowed working pressure
is 6 bar.
The pressure gauge is equipped with a needle which
is pressed into the hose to measure the pressure
inside.

Drill steel

WARNING Ejected insertion tool
If the tool retainer on the machine is not in a locked
position, the inserted tool can be ejected with force,
which can cause personal injury.
► Before changing the insertion tool, stop the
machine, switch off the compressed air supply
and bleed the machine by activating the start and
stop device.

Before fitting the drill steel

Check that the tool shank is of the correct size and
length for the chuck used. The shank must be clean
and the tool must be in good condition. Shanks which
are chipped, rounded, out of square or too hard on
the striking end will operate inefficiently and cause
premature piston failure.
Inspect the drill steel:
16
A dull drill steel will slow down the drilling speed and
overstrain the drill mechanism. When changing drill
steel make sure that the new one is the correct size
to follow your previous bore.
Before drilling, check that the flushing hole in the drill
steel is not blocked.
CAUTION Hot insertion tool
The tip of the insertion tool can become hot and
sharp when used. Touching it can lead to burns and
cuts.
Never touch a hot or sharp insertion tool.
►
► Wait until the insertion tool has cooled down before
carrying out maintenance work.
NOTICE Never cool a hot insertion tool in water, it
can result in brittleness and early failure.

Fitting the drill steel

Whenever fitting the drill steel the following
instructions must be observed:
© 2010 Atlas Copco Construction Tools AB | No. 9800 0937 90 | 2010-01-01
BBD 12, 15
Original instructions