Sthor 79053 Manual Del Usuario página 15

GB
is pressed, press the lock button with your thumb and release the switch. In order to release the lock, it is sufficient to press the
electric switch.
Drilling in wood
Before drilling, it is recommended to fix the material to be processed with a clamp or in an anvil, and then using a punch or a nail
mark the place of drilling. Install the drill in the chuck, set the speed, connect the drill to the mains and start drilling. In case of
drilling through the material, it is recommended to place a wooden pad under the material, so that the edge of the hole at the outlet
will be smooth. In case of drilling large diameter holes, it is recommended to drill first a smaller guide hole.
Drilling in metals
It is always necessary to fix the material to be processed securely. In case of thin sheet metal, it is recommended to place a piece
of wood under it, so as to avoid any deformations. Then mark the places of drilling using a punch and start drilling. Use drills for
steel. In case of drilling in white cast iron, it is recommended to use drills with sintered carbide bits. While drilling larger holes, it is
recommended to drill first a smaller guide hole. While drilling steel, cool the drill with machine oil. In case of drilling in aluminium,
use turpentine oil or paraffin to cool the drill. In case of drilling in brass, copper or cast iron do not use any substances to cool the
drill. In order to cool it, is required to remove it frequently from the material.
Drilling in ceramic materials
Drilling in hard and compact materials: concrete, hard bricks, stone, marble etc.
While the hammer drill is disconnected from the mains, install a drill in the chuck.
If necessary, install the drilling depth-limiting device.
Set the operating mode selector to drilling with hammer action, or if it is available, to drilling without hammer action.
Plug the tool to the mains, turn the hammer drill on with the switch and start work.
During work make regular breaks – avoid overheating of the hammer drill and the tool.
Drilling with hammer action is recommended only in case of compact ceramic materials: concrete, hard bricks, stone etc. In case
of drilling holes of large diameter, it is recommended to drill first a smaller guide hole, and then use a drill of the final diameter. Use
drills designed for hammer action drilling.
It is not recommended to use the hammer action function in case of ceramic materials of loose structure, such as: glaze, soft
bricks, plaster, etc. Hammer action drilling in such materials may damage the material.
The hammer drill is equipped with a clutch that prevents overloading of the electric motor in case when the tool is jammed during
work, for example as a result of hitting a reinforcement wire. In such cases the drill will stop rotating, although the electric motor
is still working.
Also excessive pressure exerted on the tool during work may cause activation of the clutch.
In such cases remove the tool from the hole, make sure the hammer drill is functioning correctly and then resume work, applying
only the pressure which is necessary for proper operation. In case a reinforcement rod or another hidden metal obstacle is hit,
drill it using the hammer action function and a drill for metal of the same diameter as the hammer action drill, and then continue
drilling in the ceramic material.
Drilling in glaze, soft brick, plaster, etc.
Drill as in case of hard materials, but without hammer action. From time to time remove the drill from the hole, in order to remove
dust and debris. While drilling press the tool with constant strength.
Adjustments of the angle of the chisel
Certain hammering tools require adjustments to a certain angle, in order to guarantee a safe and ergonomic operation, for
example chisels and cutters. It is possible to use for this purpose an adequate operating mode selector. Install the tool in the
chuck in accordance with the recommendations indicated in the manual. Set the selector to the hammer symbol with an arrow,
and then press the switch. The tool will start to rotate in accordance with the selected direction of rotation. Release the switch,
once the tool has reached the required position. Set the operating mode selector to the hammering position – hammer symbol,
and then start work.
Hammering
While the tool is disconnected from the mains install the required tool in the chuck: cutter or punch.
Set the operating mode selector to the hammering position. Plug the drill to the mains, turn the hammer drill on with the switch,
wait until it has reached the full speed and start work.
During hammering, do not drive the tool too much into the material to be processed. Hack the material off in thin layers, not
exerting excessive pressure on the hammer drill.
Carving holes
The drill may be used to carve larger holes in wood, using special drills of fixed diameter or interchangeable bits from the saw set
– jig-saws. In order to obtain smooth edges of the outlet of the hole, place a piece of wood under the material.
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