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5. Safety precautions
5.1 Basic safety information
In addition to the safety precautions listed in the indi-
vidual sections of these operating instructions, the fol-
lowingpoints mustbe strictlyobserved at all times.
5.2 Correct use
The DG150 may be operated only in conjunction with
theDPC20.TogetherwiththeHiltiVCD50Landthecor-
responding DG-CW 150/6" diamond cup wheels, the
DG150forms averyadvantageouselectrically-powered,
hand-held grinding system that releases a minimum of
dust. In order to ensure optimum dust extraction, an
industrial vacuum cleaner in good working condition
mustbe usedat alltimes. Toensure safeoperation, the
DG150may beusedonlytogetherwithoriginal Hilti cup
wheels.TheDG150isdesignedexclusivelyfordrygrind-
ing on the surface of concrete or similar mineral mate-
rials and for removing thin coatings, with a maximum
thicknessof 3mm, fromthese materials.
Thelocallyapplicablehealthregulations and corresponding
safety precautions must be observed and implemented
at all times while grinding coated or uncoated mineral
materialswith theDG150.
Do not, under any circumstances, use the tool in any
way other than as described in the operating instruc-
tions.
5.3 Incorrect use (misuse)
●The tool is not suitable for grinding metals, wood or
othermaterials notlisted atparagraph 5.2.
●The tool is not suitable for use with diamond cutting
discs, abrasive cutting or grinding discs, wire brushes
orotherinserttoolsnotapprovedforuse(seesection3).
●Thetool isnot suitablefor wetgrinding.
●Donot clampthe toolin avice.
●Grinding materials containing asbestos is not per-
missible.
●Materialscontainingsubstanceshazardousto health
may be ground only after consultation with the local
authority responsible for safety at work and in accor-
dancewiththelocally applicable regulationsconcerning
safetyat work.
●Diamondcupwheels,clampingflanges and clamping
nuts not listed in section 3 "Diamond cup wheels and
accessories"may notbe used.
5.4 State of the art
●The tool is designed and manufactured according to
thestate ofthe art.
●Thetoolanditsancillaryequipment may presenthaz-
ards when used incorrectly by untrained personnel or
notas directed.
5.5 Proper arrangement and organisation of the work-
place
●Work from a safe stance and remain in balance at all
times.
●Whenworkingoutdoors,the use ofrubberglovesand
non-slipshoes isrecommended.
●Avoidunfavourablebody positions.
●Ensurethat theworkplace iswell lit.
●Objectswhichcouldcauseinjury shouldberemoved
fromthe workingarea.
●Keepotherpersons,childrenin particular,outsidethe
areaaffected(toolandsupply cord) whileyouarework-
ing.
●Grindingoffprojectingobjectssuch as nailsandscrews
etc. is not permissible. Such objects must be removed
carefullybefore beginninggrinding.
●Do not wear loose clothing, loose long hair and jew-
ellery whichcould becomecaught upin movingparts.
●Alwaysleadthesupplycord, extension cordandextrac-
tionhose awayto therear whenworking.
●Takecaretoavoidtrippingoverthe supply cord,exten-
sioncord orextraction hose.
●Donotexposethe tool torainorsnowand do notuse
itin dampor wetareas or wherethere isa riskof fire or
explosion.
●Avoid a high dust concentration by ensuring that the
workplaceis wellventilated.
●The side handle must be fitted to the tool at all times
whenin use.
●Keepthegripsdry,cleanandfree fromoilandgrease.
●Thetool mustbe heldby bothhands whenin use.
●Useclamps ora viceto secureloose workpieces.
●Takecareof thecup wheels.Youwill workmore effi-
ciently and more safely if the cup wheels are kept clean
andsharp(segmentsunpolished). Observe themainte-
nance regulations and instructions on changing cup
wheels.
●Takecareto avoid concealed electric cables,gas and
water pipes. Check the working area, e.g. using a metal
detector.
●Sparks may fly when grinding. Take care to ensure
that flying sparks do not present a hazard to other per-
sons. Due to the risk of fire, grinding must not be car-
ried out in the vicinity of inflammable materials (within
thearea offlying sparks).
●Forincreasedpersonalsafety,theuseofaground fault
interrupter / residual current device (30 mA) is recom-
mendedundercertaincircumstances,e.g.invery damp
conditions or where large quantities of conductive dust
areproduced.
