Additional Safety Precautions - Hilti DD 250 Bedienungsanleitung

▶ Use power tools, accessories, insert tools, etc. only as described in this manual. Take the working
conditions and the work to be performed into account. Use of the power tool for operations different
from those intended could result in a hazardous situation.
▶ Keep grips and gripping surfaces dry, clean and free from oil and grease. Slippery grips and gripping
surfaces do not allow the power tool to be safely operated and controlled in unforeseen situations.
Service
▶ Have your power tool repaired only by qualified,skilled personnel, using only genuine Hilti spare
parts. The safety of the power tool can thus be maintained.
2.2.2 Diamond drill safety warnings
▶ When performing drilling that requires the use of water, route the water away from the operator's
work area or use a liquid collection device. Such precautionary measures keep the operator's work
area dry and reduce the risk of electrical shock.
▶ Operate power tool by insulated grasping surfaces, when performing an operation where the
cutting accessory may contact hidden wiring or its own cord. Cutting accessory contacting a "live"
wire may make exposed metal parts of the power tool "live" and could give the operator an electric
shock.
▶ Wear hearing protection when diamond drilling. Exposure to noise can cause hearing loss.
▶ When the bit is jammed, stop applying downward pressure and turn off the tool. Investigate and
take corrective actions to eliminate the cause of the bit jamming.
▶ When restarting a diamond drill in the workpiece check that the bit rotates freely before starting. If
the bit is jammed, it may not start, may overload the tool, or may cause the diamond drill to release from
the workpiece.
▶ When securing the drill stand with anchors and fasteners to the workpiece, ensure that the
anchoring used is capable of holding and restraining the machine during use. If the workpiece is
weak or porous, the anchor may pull out causing the drill stand to release from the workpiece.
▶ When securing the drill stand with a vacuum pad to the workpiece, install the pad on a smooth,
clean, non-porous surface. Do not secure to laminated surfaces such as tiles and composite
coating. If the workpiece is not smooth, flat or well affixed, the pad may pull away from the workpiece.
▶ Ensure there is sufficient vacuum before and during drilling. If the vacuum is insufficient, the pad
may release from the workpiece.
▶ Never perform drilling with the machine secured by the vacuum pad only, except when drilling
downwards. If the vacuum is lost, the pad will release from the workpiece.
▶ When drilling through walls or ceilings, ensure to protect persons and the work area on the other
side. The bit may extend through the hole or the core may fall out on the other side.
▶ When drilling overhead, always use the liquid collection device specified in the instructions. Do
not allow water to flow into the tool. Water entering the power tool will increase the risk of electric
shock.

2.2.3 Additional safety precautions

Personal safety
▶ Tampering with or modification of the machine is not permitted.
▶ The machine is not intended for use by inexperienced persons who have received no special
training.
▶ Keep the machine out of reach of children.
▶ Avoid touching rotating parts. Switch the machine on only after it is in position at the workpiece.
Touching rotating parts, especially rotating accessory tools, may lead to injury.
▶ Avoid skin contact with drilling slurry.
▶ Dust from materials, such as paint containing lead, some kinds of wood, concrete / masonry / stone
containing silica, and minerals as well as metal, may be injurious to health. Contact with or inhalation of
the dust may cause allergic reactions and/or respiratory or other diseases to the operator or bystanders.
Certain kinds of dust are classified as carcinogenic such as oak and beech dust, especially in conjunction
with additives for wood conditioning (chromate, wood preservative). Material containing asbestos must
only be handled by specialists. Use a dust removal system that is as effective as possible. Accordingly,
use a suitable vacuum cleaner of the type recommended by Hilti for wood dust and/or mineral dust and
which is designed for use with this power tool. Ensure that the workplace is well ventilated. The use
of a dust mask suitable for the particular type of dust is recommended. Observe national regulations
applicable to the materials on which you intend to use the machine.
▶ The diamond core drilling machine and the diamond core bit are heavy pieces of equipment. There is a
risk of crushing parts of the body. The user and any other persons in the vicinity must wear suitable
36 English
Printed: 22.08.2017 | Doc-Nr: PUB / 5245693 / 000 / 02 Printed: 22.08.2017 | Doc-Nr: PUB / 5245693 / 000 / 03