Hitachi NR 65AK, Service Manual

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5-3. Nail Driving Force
Fig. 2 shows by type of wood and nail the nailer output energy provided by the supply pressure and the nailing
energy required for driving the nail flush. Air pressure which exceeds the intersecting point between the nailer
output energy and the required nailing energy for driving the nail allows the nail to be fully driven.
For example, when driving a nail of 3.3 mm dia. x 38 mm length (0.131" x 1-1/2") into a workpiece of hemlock with
the Model NR 65AK, a pressure of about 5.5 bar (5.7 kgf/cm 2 , 80 psi) allows the nailer to drive the nail flush with
the wood surface. A pressure beyond this value causes the nail head to be driven below the wood surface.
Fig. 2 should be used as a reference only because those values vary depending on the type of wood, moisture
content, and grain of wood.
Fig. 2 Required nailing energy and nailer output energy
Air pressure setting to drive nail flush with NR 65AK
Hemlock
HITACHI NR 65AK
Y
R
3.3 x 38 mm (0.131" x 1-1/2") 3.8 x 38 mm (0.148" x 1-1/2") 3.8 x 64 mm (0.148" x 2-1/2")
4.1 x 64 mm (0.162" x 2-1/2")
200 250 100 150 (mm
2
)
0.15
0.2 0.25
0.3 0.35 0.4 (in
2
)
80
60
40
20
1000
800
600
400
200
100
80
60
40
20
80
60
40
20
1000
800
600
400
200
100
80
60
40
20
Required nailing energy Nailer output energy