Weka HD16 Notice D'utilisation page 19

should note when using the machine.
Please observe the special instructions for the drill rig.
Kinds for fixing the rig
Fixing the stand using dowels, by vacuum and 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 16 mm.
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 seal is released.
In case of wet drilling it is possible to suck up the water with a vacuum cleaner through a water-collecting
ring.
6.3 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 to the axe) or use
the start drilling aid (special accessories).
After the bit has worked its way into the object for about 1/8-1/4 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
millimeters. This can simply be a wooden plate with a recess in it in 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.
ATTENTION: 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 60 mm. In case of a sudden blocking of
the core bit the machine, despite the safety clutch, might get out of control and hurt you
considerably. Avoid working positions at face level.
6.4 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 drilled 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 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.
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.
7. M A I N T E N A N C E
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 and grease
it.
Clean the machine with a dry or moist cleaning-rag and not with a jet of water.
Damaged frequency converters, cords and plugs have to be repaired or exchanged exclusively in an
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