Manual Makita BDF 442 (page 6 of 48) (English, German, Dutch, Danish, French, Italian, Portuguese, Spanish)

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• Do not use the speed change lever while the tool is

running. The tool may be damaged.

Adjusting the fastening torque (Fig. 6)

The fastening torque can be adjusted in 17 steps by

turning the adjusting ring so that its graduations are

aligned with the pointer on the tool body. The fastening

torque is minimum when the number 1 is aligned with the

pointer, and maximum when the marking is aligned with

the pointer.

The clutch will slip at various torque levels when set at the

number 1 to 16. The clutch is designed not to slip at the

marking.

Before actual operation, drive a trial screw into your

material or a piece of duplicate material to determine

which torque level is required for a particular application.

ASSEMBLY

CAUTION:

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

battery cartridge is removed before carrying out any

work on the tool.

Installing or removing driver bit or drill bit

(Fig. 7)

Turn the sleeve counterclockwise to open the chuck jaws.

Place the bit in the chuck as far as it will go. Turn the

sleeve clockwise to tighten the chuck.

To remove the bit, turn the sleeve counterclockwise.

Installing bit holder (Optional accessory)

(Fig. 8)

Fit the bit holder into the protrusion at the tool foot on

either right or left side and secure it with a screw.

When not using the driver bit, keep it in the bit holders.

Bits 45 mm long can be kept there.

Hook (Optional accessory) (Fig. 9)

The hook is convenient for temporarily hanging the tool.

This can be installed on either side of the tool.

To install the hook, insert it into a groove in the tool

housing on either side and then secure it with a screw.

To remove, loosen the screw and then take it out.

OPERATION

CAUTION:

• Always insert the battery cartridge all the way until it

locks in place. If you can see the red part on the upper

side of the button, it is not locked completely. Insert it

fully until the red part cannot be seen. If not, it may

accidentally fall out of the tool, causing injury to you or

someone around you.

Hold the tool firmly with one hand on the grip and the

other hand on the bottom of the battery cartridge to

control the twisting action.

Screwdriving operation (Fig. 10)

CAUTION:

• Adjust the adjusting ring to the proper torque level for

your work.

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.

Drilling operation

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

the marking. Then proceed as follows.

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.

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.

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

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Makita BDF 442 Manual

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