Screwdriving Operation; Drilling Operation - Makita BDF444 Instruction Manual

Installing or removing driver bit or drill bit
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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
1
2
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Fit the bit holder into the protrusion at the tool foot on
eithher 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
1
2
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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.
1. Sleeve
1
1. Bit holder
2. Bit
1. Groove
2. Hook
3. Screw
3
OPERATION

Screwdriving operation

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First, slide the action mode change lever so that it 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.
NOTE:
Make sure that the driver bit is inserted straight in
•
the screw head, or the screw and/or bit may be
damaged.
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)
3.1
3.5
3.8
4.5
4.8
5.1
5.5
5.8
6.1
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NOTE:
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 operation

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.
7
Recommended size of pilot hole
(mm)
2.0 - 2.2
2.2 - 2.5
2.5 - 2.8
2.9 - 3.2
3.1 - 3.4
3.3 - 3.6
3.7 - 3.9
4.0 - 4.2
4.2 - 4.4