Weka KS50 Mode D'emploi page 12

5.2 Assembling the diamond core drill
For assembling the diamond core drill to the drill rig, the machine has to be screwed first to the machine
adaptor (8). Fix the machine adaptor as shown in the picture. Therefore absolutely use the supplied
parallel keys and tighten the screws (M8x25-10.9).
Remove the eccentric shaft (9) as far as it will go and now apply the machine to the rig. Put the eccentric
shaft in again and tighten it with the hand wheel (12).
For drilling over 350mm diameter a distance plate (10) is required which is applied between machine
adaptor and core drill. If required this part has to be fixed with the supplied hexagon socket head screws
(M8x105-10.9) tightly. Thereby the distance plate has to be applied in that way that the upper border of
the machine adaptor and the distance plate run flush to each other.
5.3 Water collecting ring
For collecting the water which escapes from the drill hole when drilling wet, you need a water collecting
ring (22) and an all-purpose suction unit. The water collecting ring is suitable for WEKA diamond core
drills DK 22, DK 32, SR 35, DK 42, DK 52, SR 75.
Cut a hole with the required diameter into the sealing ring.
Apply the engaging sleeves (26) at the rig foot with hexagon socket head screws M5x12. At the steel foot,
two additional cheese head screws (31) have to be applied.
Bring the water collecting ring into position and put the tension springs to the point of support. Press the
tension springs via the chamfer of the engaging sleeve down until these engage.
Use a suitable hose coupling (27) for your water suction unit.
5.4 Drilling
When 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 (12) which is most suitable for you (left, right, direct or via fine
feed).
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.
When 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 priciple check your drilling area with a line detector.
5.5 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.
6. 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.
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