Adequate Feed Force - Atlas Copco 34-DSI Safety And Operating Instructions Manual

BBC 34-DSI
Do not mount the front attachment (B) for the rock
drill by means of the side bolts, since this can
interfere with the internal alignment of the machine,
resulting in damage and reduced output. See
"Appendix A" for dimensional drawings of
attachments.
To minimize stress and hole deviation, the rock drill
chuck and drill steel support must be aligned
perfectly. If drill steels longer than 1.8 m are to be
used, an intermediate drill steel support is
recommended in order to improve hole straightness.

Adequate feed force

For utilizing the impact energy of a rock drill, the drill
bit must be pressed against the rock with a certain
force. How much force depends on the impact energy
and the hardness of the rock being drilled. Higher air
pressure gives higher impact energy.
On rigs for light rock drills, a feed force of 1.4 kN is
recommended on each rock drill cradle. The feed
system must include a pressure regulator for stepless
control of the feed force.
If two or more rock drills are to be mounted on the
same feed unit, the cradle must be designed to
permit variations in the rate of penetration between
individual rock drills and must maintain the correct
feed force on each rock drill.
Correct air flushing
Flushing air must be connected to the inlet nipple (A)
to clean the drill hole while drilling. If the rock drill is
converted to water flushing, the water nipple must
be connected to either air or water to obtain sufficient
flushing. Adequate flushing of the drill hole is
important for the penetration rate and for the lifespan
of the wearing parts of the rotation mechanism.
© 2010 Atlas Copco Construction Tools AB | No. 9800 0678 71 | 2010-03-22
Original instructions
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Safety and operating instructions
Hoses and connections
Compressed air source
A.
B. Water separator, VAM 5A (optional)
Lubricator, BLG 30 or CLG 30 (optional)
C.
Maximum 3 meter (10 feet) compressed air
D.
hose between the lubricator and the machine.
E. Air hose, machine
Air hose, flushing
F.
♦ Check that you are using the correct
recommended operating pressure, 6 bar (e).
♦ The maximum permissible air pressure, 7 bar (e),
must not be exceeded.
♦ Blow any impurities out of the compressed air hose
before connecting it to the machine.
♦ Select the correct dimension and length for the
compressed air hose. For hose lengths up to 30
meters, a hose with a minimum internal diameter
of 25 mm (1 in.) should be used. If the hose length
is between 30 and 100 meters, a hose with a
minimum internal diameter of 50 mm (2 in.) should
be used.
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