Makita BHP343 User Manual download pdf (Page 6)

To remove the bit, turn the sleeve counterclockwise.

OPERATION

Hammer drilling operation

CAUTION:

• There is a tremendous and sudden twisting force

exerted on the tool/bit at the time of hole

break-through, when the hole becomes clogged

with chips and particles, or when striking

reinforcing rods embedded in the concrete.

First, turn the action mode changing ring so that the

arrow on the tool body points to the

marking. The

adjusting ring can be aligned in any torque levels for this

operation.

Be sure to use a tungsten-carbide tipped bit.

Position the bit at the desired location for the hole, then

pull the switch trigger. Do not force the tool. Light

pressure gives best results. Keep the tool in position and

prevent it from slipping away from the hole.

Do not apply more pressure when the hole becomes

clogged with chips or particles. Instead, run the tool at

an idle, then remove the bit partially from the hole. By

repeating this several times, the hole will be cleaned out

and normal drilling may be resumed.

Blow-out bulb (optional accessory)

Fig.8

After drilling the hole, use the blow-out bulb to clean the

dust out of the hole.

Screwdriving operation

Fig.9

First, turn the action mode changing ring so that the

arrow on the tool body points to the

marking. Adjust

the adjusting ring to the proper torque level for your work.

Then proceed as follows.

Place the point of the driver bit in the screw head and

apply pressure to the tool. Start the tool slowly and then

increase the speed gradually. Release the switch trigger

as soon as the clutch cuts in.

CAUTION:

• Make sure that the driver bit is inserted straight in

the screw head, or the screw and/or bit may be

damaged.

NOTE:

• When driving wood screws, predrill pilot holes to

make driving easier and to prevent splitting of the

workpiece. See the chart.

Nominal diameter of wood screw

(mm)

Recommended size of pilot hole

(mm)

3.1 2.0 - 2.2

3.5 2.2 - 2.5

3.8 2.5 - 2.8

4.5 2.9 - 3.2

4.8 3.1 - 3.4

5.1 3.3 - 3.6

5.5 3.7 - 3.9

5.8 4.0 - 4.2

6.1 4.2 - 4.4

006421

Drilling operation

First, turn the adjusting ring so that the pointer points to

the

marking. Then proceed as follows.

CAUTION:

• Pressing excessively on the tool will not speed up

the drilling. In fact, this excessive pressure will only

serve to damage the tip of your bit, decrease the

tool performance and shorten the service life of the

tool.

• There is a tremendous force exerted on the tool/bit

at the time of hole break through. Hold the tool

firmly and exert care when the bit begins to break

through the workpiece.

• A stuck bit can be removed simply by setting the

reversing switch to reverse rotation in order to back

out. However, the tool may back out abruptly if you

do not hold it firmly.

• Always secure small workpieces in a vise or similar

hold-down device.

• If the tool is operated continuously until the battery

cartridge has discharged, allow the tool to rest for

15 minutes before proceeding with a fresh battery.

Drilling in wood

When drilling in wood, the best results are obtained with

wood drills equipped with a guide screw. The guide

screw makes drilling easier by pulling the bit into the

workpiece.

Drilling in metal

To prevent the bit from slipping when starting a hole,

make an indentation with a center-punch and hammer at

the point to be drilled. Place the point of the bit in the

indentation and start drilling.

Use a cutting lubricant when drilling metals. The

exceptions are iron and brass which should be drilled

dry.

MAINTENANCE

CAUTION:

• Always be sure that the tool is switched off and the

battery cartridge is removed before attempting to

perform inspection or maintenance.

To maintain product SAFETY and RELIABILITY, repairs,

any other maintenance or adjustment should be

performed by Makita Authorized Service Centers,

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Makita BHP343 User Manual Page 6

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