Berner BS 200 Manual De Usuario página 23

7
A proper drill stand fastening leads to high drilling
performance and good hole quality, besides reducing
friction, increasing safety and reducing segments wearing.
Your core drill stand, depending on the model, can be
fastened in different ways.
Anchor fastening
Your stand can be fastened using different kind of anchor
depending on the material of the workpiece. This fastening
mode is effective but time-consuming since it needs an
anchor for each hole you want to perform.
Warning: for your safety, make always sure
that the material in which you install the anchor
and the anchor itself are suitable to hold the
system when drilling. Sometimes you may
need more than one anchor. In any case the
anchor's thread must be at least M12.
Read the instructions provided by the anchor
manufacturer and make sure that the anchor is
suitable for this use.
Follow these instructions:
once decided the position of the hole, identify
▪
the position of the anchor. The closer the
anchor is to the column, the better the fastening
is;
choose a proper anchor for the specific
▪
application making sure that the thread is at
least M12;
make a suitable hole for the anchor and insert it
▪
into the hole. Than, tighten a proper threaded
bar to the anchor;
▪ position the stand over the bar inserting the bar
(figure 4 I) into the slot (H) on the base. Put the
washer (included in the package with your
stand) over the bar and tighten securely the nut
(see figure 4). Make sure that the washer is
securely engaged with the base.
▪ if needed, turn the G screws in order to adjust
the base.
Proper anchors are
accessories.
Vacuum fastening
Vacuum fastening is possible if your rig stand is provided
with a vacuum fastening compatible base (figure 5) or with
vacuum fastening accessories.
Vacuum fastening means that the base is kept securely in
position by the vacuum created by a vacuum pump. You
can use vacuum fastening only if the surface where you
position your base is:
▪ flat, clean and free of debris, preventing suction
drops;
strong enough to hold the system. Make sure
▪
the surface is compact, preventing the stand
from dropping off when drilling (for example not
well-applied plaster or tiles, glued tiles...are not
suitable for vacuum fastening).
If the surface is compact but not flat enough you can level it
removing roughness and/or applying some plaster where
the rubber seal will be placed.
Warning: always determine where the core drill
can drop off in case something goes wrong. Do
not stay in this area and do not allow anybody to
stay there, in particular in case of horizontal and
overhead (upwards) drilling.
Warning: in case of horizontal or overhead
(upwards) drilling, use further holding systems
07-2020
available among BERNER
English
that hold the core drill in case of drop off,
avoiding damage or injury. You can use for
example chains, an adjustable tubular prop that
fit into the F part of your stand, a scaffold or
rolling scaffold.
For your safety, we recommend to use a vacuum pump
equipped with safety vacuum tank.
Warning: follow the limitations below when
vacuum fastening.
Do NOT use vacuum fastening in the following cases:
▪ drilling diameter exceeds 250 mm;
the power of the core drill motor exceeds 3500
▪
W in case of electric motors, or equivalent in
case of non electric-powered motors;
▪ the core drill is not equipped with a torque
limitation system in case of overload.
Vacuum fastening can be carried out using stands with
base in figure 5. Use only vacuum pump equipped with
vacuum gauge. For vacuum fastening proceed as follows
referring to figure 5:
fit the rubber seal M in the slot in the under side
▪
of the base, making sure that the slot is properly
clean (5/A).
place the vacuum plug (N) over the opening (H)
▪
in the base. Make sure that the plug has the
rubber seal on. Than tighten the screw with
washer O from the under side of the base as
shown in figure 5/B. Use the Allen key provided;
loosen the 4 leveling screws L till they are
▪
completely inside the base;
▪ connect the pipe from the pump to the
connector P (5/D) or to the quick-connector P
(5/C). Make sure that the pipe is suitable for the
application.
Warning: always fix the pipe using a proper
hose clamp as shown in figure 5/C and 5/D.
position the stand;
▪
▪ switch the vacuum pump on;
▪ make always sure that the pressure under the
base is between -0,8 and -1 bar (green area).
You can read the pressure either on the gauge
of the pump or the one in figure 17;
Warning: the pump must be on in order to
secure the base: keep the vacuum pump on as
long as the application requires. Switch the
pump off just when you want to remove the
stand.
Warning: if the pressure under the base is
between -0,8 and 0 (red area), stop drilling,
switch the motor off and discover and remove
the cause of the
When you finish drilling, remove the seal in order to avoid
to damage it.
Overhead upward drilling
You can perform overhead upward drilling using a proper
core drill motor. Consider that the fastening system has to
hold, besides the push, also the system (stand, drill motor,
core bit), the weight of the water inside the core bit and the
core (when finish drilling).
If you use an electric drill motor than you must use a water
collecting system. This system is available among
BERNER accessories for drilling diameters below 330 mm.
In the other cases, use liquid tight motors (hydraulic,
suction drop.