Keypad And Display - Weka SR 25 Manual De Instrucciones

4.3 Fitting up in the core drill rig
The SR25/38/68 is fastened at the gear foot (see illustration) with 4 M8 screws (SR65: 6 screws M8,
SR75: 8 screws M8) with the core drill rig (2) or through an adapter disc which is delivered by
manufacturer of the drill rig.
Choose these screws with a length of thread engagement of at least 20 mm (SR25/38 15mm) and
tighten them with a torque of 20 Nm.
Place the machine only in a stable core drill rig which has precise guides which are free from clearance.
Ensure that the machine axis is absolutely parallel to the rig column.
Only use rigs with sufficient stability.
Only tear the drill bit without any obstacles from the bore hole, i.e. do not try to pull out a jammed drill bit, as
high angular forces on the drill spindle can break the bearing case. Take care, especially on horizontal drilling,
that the core is not pulled out with the core bit, as its high weight can also break the bearing case.
Since the rig is not included in the delivery, only a few important features are noted here.
The safety and operating instructions for the drill rig being used are to be strictly
observed.
Fixing methods
Dowel fixing - The most common method of fixing is dowel fixing. Use only metal dowels.
Bracing - It is also possible to fasten the drill stand with a suitable quick shift column against a rigid wall.
Appropriate columns are offered by the diamond tool market.
With the SR-machine you can also drill overhead without any further precautions. For protecting the
operator against water, you should however on principal use a water collecting ring (accessory for drill
rig). Consider that the drilled core slips into the core bit and thus loads machine and drill rig additionally.
Bigger cores have to be secured accordingly.
In order to avoid too high physical burden the diamond core drill and drill rig are to be assembled and
carried separated from each other.
4.4 Diamond drill bit
The SR-machine´s tool fixture consists of a shaft with a female thread of 1 ¼" UNC or the much easier
to loosen thread M33/3. Only use suitable high-quality diamond tools.
Only use appropriate diamond tools and ensure that the diamond segments are sufficiently larger than
the inner and outer diameter of the drill bit tube.
Apply water-resistant grease to the tool thread so that the tool can be easily loosened.
Fasten the drill bit tightly to the thread.
Ensure that the radial run out on the diamond segments of the drill bit is no greater than 1mm
(eccentricity).
Only use suitable wrenches for changing the core bit. Thereby hold the drilling spindle with another
wrench.
Never use a hammer or something similar to open the core bit. If necessary elongate the
wrench.
5. P U T T I N G I N T O O P E R A T I O N
5.1

Keypad and display

The SR-machine is fitted with a display. Via the keypad the motor can be started (green button) and
switched off (red button). Via the buttons + and - the speed can be preselected in 6 (4) steps. The
suitable drilling diameters are thereby shown in the display. When switching on by the start button the
motor is started with the preselected speed. The speed can also be changed while drilling, by simply
choosing the desired drilling diameter and pressing the start button again.
On the SR25/65 two diameters are displayed alternately. The first value corresponds to a cutting speed
of 2,5 m/s, the second value to the speed of 4,5 m/s.
On the SR38/68/75 three different drilling diameters are displayed alternately which refer to the three gear
speeds. The shown drilling diameters are calculated at the middle cutting speed of 3,5 m/s.
The speeds overlap in each step, thus at least two steps can be selected for one drilling diameter for
reaching the best possible results.
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