According to those regulations WEKA core drills with water supply are
provided with a PRCD inline protector assembled between the cord.
The PRCD includes a GFCI as well as an under voltage breaker.
The PRCD is ready for service after connecting the electric main by
pressing the ON button. If the voltage is disconnected, the PRCD
switches off and is, after the voltage returns, to start once more.
ATTENTION: Do not put the PRCD into water. It is
regularly to be checked on perfect functioning by
pressing the TEST key. Never use a core drill with a GFCI
being directly connected to the mains connection.
2. WATER SUPPLY
Connect the machine with the water supply by using a GARDENA
coupling to the Quick Connect Nipple. ATTENTION: Maximum water
pressure is 3 bar. Use only clean water because the sealing wears
more quickly with dirty water. If water comes out of the indicator hole
the rotary shaft seals are to be replaced immediately. It is preferable
to have this done in an authorised specialist’s workshop only.
3. INSTALLATION IN THE DRILL STAND
In the drill stand, the machines are fastened by clamping the gearbox
( 60mm). Put the machine into a solidly designed drill stand that is
equipped with a clamping ring that exactly fits the machine. Be careful
that the machine’s axis is absolutely parallel to the stand column.
4. MOTOR SWITCH AND OVERLOAD PROTECTION
After having switched on the motor starts softly. If the machine is
being overloaded the motor electronic switches over to the pulsating
operation for showing the operator the overload. If the force is then
not reduced, the motor switches off after a few seconds. After
switching the machine off and on again, the motor starts again softly.
The motor electronic can temporarily be used on 260 volt. Higher
voltages however can cause irreparable damages. Please note that
when operating the machine via a generator, this not generate higher
voltage peaks.
5. GEAR CHANGING
The DK16 is equipped with a 3-speed gear unit. Please do never
change gears forcibly but only when the machine has come to a
complete stop.
6. SAFETY CLUTCH
The integrated safety clutch protects the operator, the machine and the
tools against high mechanical overstrain. Please notice that the
safety clutch is activated after only 2-3 seconds because
otherwise the wear and the development of heat increase greatly.
1. DIAMOND CORE BITS
The tool fixture is prepared for standard drill bits with G½”, 1 ¼” UNC
or the new M 33/3 thread.
Only use appropriate diamond tools of high quality. Especially when
drilling manually use core bits that cut easily and have a low specific
initial pressure. Take care that the segments jut out sufficiently against
the tube. Take care that the radial run out at the diamond segments of
the core bits is not more than 1mm.
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.
2. DRILLING – DIRECTED BY A DRILL RIG (STAND)
Fixing the stand using dowels, by vacuum and a by a brace.
The mainly applied method to fix the stand is given by using dowels. It
is preferable to use metal dowels. The diameter must be at least
10mm.
When fixing the stand by vacuum take care that the vacuum is
sufficient high. Make sure the seals are not worn out. Please take
care that the rig is really fixed solid and stable, if by aid of the adjusting
screws at the base plate of the rig the vacuum is released.
See separate Drill Rig Operating Instructions (DRU160)
before using drill rig.
3. DRILLING – HAND HELD
Open the ball valve and start the machine.
Hold the core drill as rigidly as possible.
Touch the surface you want to work on with the core bit in a slight
angle (of about 30 degrees to the axe) or use a start drilling aid.
After the bit has worked its way into the object for about 1/8 – ¼ of the
circle’s circumference, turn the core drill up into a right-angled position,
using sufficient initial pressure. Formula: drilling diameter in mm x 4 =
contact power in N.
Use especially for bigger core bits a drilling start aid which helps to
keep track for the first few millimetres. This can simply be a wooden
plate with a recess in it the shape of a triangle in which the core bit can
be guided.
Take special care that the core bit is directed in a straight way in the
drilled hole so it does not block.
ATTNETION: Please do consider that the machine has a
very high torque, especially in the first gear. Therefore,
drill manually only extremely concentrated, especially
when working in the first gear and with diameters of more than
60mm. In case of a sudden blocking of the core bit the machine,
despite the safety clutch, might get out control and hurt you
considerably. Avoid working positions at face level.
5. GENERAL DIRECTIONS FOR DRILLING
Adjust the quantity of water by using the ball valve to such an extent
that the loose material gets completely washed out of the drill hole.
You do not wash out enough material if mud occurs around the drilled
hole.
Use sufficient contact pressure. If it is too low the diamonds tend to
polish. This means that the feed speed becomes less until finally no
material is being cleared away any more. In this case the segments
are to “sharpen” again by means of a SiC-grindstone.
Take care that the core bit does not vibrate; otherwise the diamonds
are detached by force.
By drilling of reinforcements you might have to use greater initial
pressure and the next lower gear.
In case the machine gets stuck do not try to loosen it by switching it on
and off. Immediately switch off the machine and loosen the bit by
turning an appropriate wrench to the left and right. At the same time,
pull the machine out of the drilled hole carefully.
ATTENTION: If oil comes out of the machine, stop working with it
immediately. Leakage of oil does damage the gear system.
Take care not to cut a water pipe or even an electric mains. In
case of doubt use a line detector for searching the drilling area.
6. MAINTENANCE
Always and on principle pull the mains plug before
beginning with works of maintenance or repairs.
Clean the machine after you have finished drilling. Do not forget to
clean the core bit thread.
Clean the machine with a dry or moist cleaning rag and not with a jet of
water. Keep the ventilation apertures clean.
Damaged PRCDs, cords and plugs have to be repaired or exchanged
exclusively in an authorised repair station.
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