MasterForce 241-0413 Manuale dell'Operatore Scaricare il pdf (Pagina 15)

Page 14

OPERATION

NOTICE: Rotate the chuck body in the

direction of the arrow marked OPEN to

close the chuck jaws. Do not use a

wrench to tighten or loosen the chuck

jaws.

3. Remove the drill bit.

GENERAL DRILLING (FIG. 9)

1. Check the direction of rotation selector

for the correct setting (forward or

reverse).

2. Secure the material to be drilled in a vise

or with clamps to keep it from turning as

the drill bit rotates.

3. Hold the hammer drill ﬁrmly and place

the bit at the point to be drilled.

4. Depress the trigger switch to start the

hammer drill.

5. Move the drill bit to contact the work-

piece, applying only enough pressure

to keep the bit cutting. Do not force the

drill or apply side pressure to elongate a

hole. Let the tool do the work.

6. When drilling hard, smooth surfaces, use

a center punch to mark the desired

location of the hole. This will prevent the

drill bit from slipping off-center as the

hole is started.

7. When drilling metals, use 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.

8. If the bit jams in the workpiece or if

the hammer drill stalls, stop the tool

immediately. Remove the bit from the

workpiece and determine the reason for

jamming.

NOTICE: This hammer drill is equipped

with an electric brake. When the brake is

functioning properly, sparks may be

visible through the vent slots in the

housing. This is normal and is the action

of the brake.

DRILLING MODE OPERATION

1. Select the desired speed to match the

planned operation.

2. For wood drilling, use twist bits, spade

bits, power auger bits or hole saws.

Begin drilling at a very low speed to

prevent the bit from slipping off of the

starting point and 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.

3. For metal drilling, use high speed steel

twist drill bits. Begin drilling at a very low

speed to prevent the bit from slipping

off of the starting point. Maintain a

speed and pressure which allows

cutting without overheating the bit. Use

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.

4. If the hammer drill stalls, it is usually

because it is being overloaded.

Release the trigger switch immediately,

remove the drill bit from work, and

determine the cause of stalling.

FIG. 9

1 2 ... 10 11 12 13 14 15 16 17 18 19 20

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