11
6.2
Water collecting ring
For collecting the water which escapes from the drill hole when drilling wet, you need a water collecting
ring (21) and an all-purpose suction unit.
Push the tension spring (24) as far as it will go into the gap between rig foot (1) and rig column (4). Take
care that the angled part of the tension spring points downwards. Bring the water collecting ring (21) into
position and put the tension spring onto the supporting point at the water collecting ring. (The links at the
ends of the tension spring are required for pulling the spring upwards.) By the tension force of the spring
the water collecting ring with its sealing is pushed to the underground and together with the vacuum of the
wet/dry suction unit avoids the water outlet.
The water collecting ring can be turned within its tension ring, for bring the connecting piece into the
desired position. Therefore open the fastening of the tension ring at the water collecting ring, turn the
water collecting ring as required and close the fastening again.
6.3
Drilling
W hen the drill rig if necessary with water collecting ring is fixed absolutley safe and rigid and is adjusted,
open the water valve so that enough water for cooling and flushing is available. Choose the gear on the
core drill which is most suitable for your drilling diameter and switch the machine on.
Choose the position of the hand wheel (20) which is most suitable for you (left or right).
Start drilling by turning the feed wheel at the drill rig carefully. Thereby take care that the core bit does
neither vibrate or shake heavily. When the core bit has centered itself after approx. 1 - 2 cm drilling depth,
the feed force can be increased until the optimal feed power is reached, however only to the maximum
power of the machine.
W hen you drill reinforcement you have to increase the feed force if necessary for ensuring an appropriate
feed. Often it makes sense to change the gear on the machine to a lower speed.
Ensure that you do not drill into or through a water pipe or even an electric mains. In case
of doubt you should on principle check your drilling area with a line detector.
When drilling with vacuum fixture the feed power may only be so high that the drill rig
does not tilt over and thus loosen the vacuum. When the drill rig begins to tilt, the feed
power must be reduced immediately.
6.4
General directions for drilling
Adjust the water quantity at the ball valve when drilling wet so that the cutted material is flushed from the
drill hole completely.
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 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 from the core
bit.
In case the tools gets stuck, do not try to loosen it by switching the machine 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.
7.
M A I N T E N A N C E
Clean the machine after finishing the drilling. Thereby also clean the thread of the tool fixture and grease
it.
Oil the threads of the lackscrews and the bearings of the feed and clamp shaft regularly.
Keep the toothed rack and the bearing surface of the column always clean.
7.1
Adjusting the guide slide bearings
For achieving good drilling results, the clearance between feed slide (16) and rig column (4) has to be as
low as possible.
Over the time the guide rolls may wear out and clearance can occur between the guide rolls and the rig
column. For eliminating this clearance both guide rolls must be readjusted on the side of the fixing brake
(19). Loosen both hexagon nuts (33) with a socket wrench (wrench size 17mm).
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