Ryobi ZRD620H Manuel d'utilisation et d'entretien télécharger pdf (Page 9)

9 — English

NOTE: The hammer drill has not been designed for reverse

hammering.

Use carbide-tipped bits and select hammer mode when

drilling in hard materials such as brick, tile, concrete, etc.

Select normal drill mode when drilling with twist drills, hole

saws, etc., in soft materials.

DRILLING/DRIVING SCREWS

See Figure 10, page 12.

 Depress and release the switch trigger to be sure the drill

is in the OFF position before connecting it to a power

supply.

 Check the direction of rotation selector for the correct

setting (forward or reverse).

 Secure the material to be drilled in a vise or with clamps

to keep it from turning as the drill bit rotates.

 Plug the drill into power supply.

 Hold the drill firmly and place the bit at the point to be

drilled, or where the screw is to be driven.

WARNING:

Do not drive a screw where there is likely to be hidden

wiring behind the surface. Contact with a “live” wire will

make exposed metal parts of the tool “live” and possibly

shock the operator. If you must drive a screw where hid-

den wire may be present, always hold tool by insulated

gripping surfaces (handle) when performing the operation

to prevent a shock to the operator.

 Depress the switch trigger to start the drill.

 Move the drill bit into the workpiece, applying only enough

pressure to keep the bit cutting or driving the screw. Do

not force the drill or apply side pressure to elongate a

hole. Let the tool do the work.

WARNING:

When drilling, be prepared for binding at bit breakthrough.

When these situations occur, the drill has a tendency to

grab and kick in the opposite direction and could cause

loss of control when breaking through material. If not

prepared, this loss of control can result in possible seri-

ous injury.

 When drilling hard, smooth surfaces, use a center punch

to mark the desired hole location. This will prevent the

drill bit from slipping off-center as the hole is started.

 If the bit jams in the workpiece or if the drill stalls, stop

the tool immediately. Remove the bit from the workpiece

and determine the reason for jamming.

OPERATION

WOOD AND METAL DRILLING

For maximum performance, use high speed steel bits for

wood or metal drilling. Select drilling mode. Begin drilling

at a very low speed to prevent the bit from slipping off the

starting point.

Wood Drilling

 Increase the speed as the drill bit bites into the material.

 When drilling through holes, place a block of wood behind

the workpiece to prevent ragged or splintered edges on

the back side of the hole.

Metal and Steel Drilling

 Use a light oil on the drill bit to keep it from overheating.

The oil will prolong the life of the bit and increase the

drilling action.

 Maintain a speed and pressure which allows cutting

without overheating the bit. Applying too much pressure

will:

• Overheat the drill;

• Wear the bearings;

• Bend or burn bits; and

• Produce off-center or irregular-shaped holes.

 When drilling large holes in metal, start with a small bit,

then finish with a larger bit.

MASONRY DRILLING

For maximum performance, use carbide-tipped masonry

impact bits or designated hammer drill bits when drilling

holes in brick, tile, concrete, etc. Select hammer mode.

 Apply light pressure at medium speed for best results in

brick.

 Apply additional pressure for hard materials such as

concrete.

 When drilling holes in tile, practice on a scrap piece to

determine the best speed and pressure. Begin drilling at

a very low speed to prevent the bit from slipping off the

starting point.

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Ryobi ZRD620H Manuel d'utilisation et d'entretien Page 9

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