Hilti DSH 900-X Mode D'emploi Original page 42

6 Types of work
6.1 Cutting techniques
There is a risk of kickback if the gasoline-powered saw comes into contact with the working surface in the
area indicated.
Kickback is the result of product misuse and/or incorrect operating procedures or conditions. To prevent
kickback, follow the safety instructions and the instructions for use below.
▶ Do not bring the accessory tool into contact with the working surface in the area marked.
▶ Allow the gasoline-powered saw to reach full speed before starting the cut.
▶ Apply pressure to the product so that the accessory tool enters the material slowly.
▶ Apply moderate pressure, adjusting the rate of advance to suit the material being cut.
A decrease in the rate of cutting progress may be an indication of blunt/dull ("polished") diamond
segments. The diamond segments can be resharpened by making a few cuts in an abrasive
material (Hilti sharpening plate or sand-lime block).
▶ Guide the gasoline-powered saw smoothly and without applying lateral pressure to the cut-off wheel.
▶ Always hold the gasoline-powered saw and the saw trolley firmly with both hands on the grips provided.
Keep the grips dry, clean and free from oil and grease.
▶ Make sure there is no-one in the working area and, in particular, in the direction in which the cut is to be
made. Keep everyone approx. 15 m away from your workplace.
6.2 Avoiding stalling
If the cut-off wheel binds, the product tends to pull away from the operator.
CAUTION
Risk of cut-off wheel breakage or kickback. Application of excessive pressure causes distortion of the
cut-off wheel. Sticking or stalling of the cut-off wheel increases the probability of kickback or cut-off wheel
breakage.
▶ Avoid applying excessive pressure when cutting and don't allow the cut-off wheel to stick and stall.
▶ Don't attempt to make an excessively deep cut.
1. Cutting through thick workpieces should be accomplished, as far as possible, by making a several cuts.
Avoid making excessively deep cuts.
2. Never attempt to cut through more than one workpiece at a time.
3. Support slabs or large workpieces so that the kerf remains open during and after the cutting operation.
6.3 Avoiding kickback
Kickback is a sudden reaction to a pinched or snagged rotating wheel. Snagging or binding brings the
rotating accessory tool to an abrupt stop. This causes the product to be accelerated in the direction opposite
to the accessory tool's direction of rotation at the point of binding. For example, if a cut-off wheel is snagged
or pinched by the workpiece, the edge of the cut-off wheel entering the pinch point can dig into the surface
of the material causing the cut-off wheel to climb out or kick back. If this happens the cut-off wheel moves
toward or away from the operator. The further forward the cut-off wheel binds, the higher the probability of a
kickback. Cut-off wheels can also break under these conditions. A kickback is the result of product misuse
and/or incorrect operating procedures or conditions. It can be avoided by taking the proper precautions as
described below.
If the cut-off wheel binds when the product is cutting in the direction of the ground, the product can jump
forward in an uncontrolled manner.
If the cut-off wheel binds when the product is cutting vertically, for example in a wall, the product can jump
upward in an uncontrolled manner.
1. Always bring the cut-off wheel into contact with the workpiece from above, with the throttle trigger fully
depressed.
▶ Allow the cut-off wheel to contact the workpiece only at a point below its rotational axis.
2. Take special care when inserting the cut-off wheel in an existing kerf.
34 English
9
8
9
2271384
*2271384*