Actual Noise When Tightening Wood Screws And Bolts - Hitachi WR12DMB - 12.0 V 1/2" Impact Wrench 2 Battery Service Manual

7.6 Actual Noise When Tightening Wood Screws and Bolts

(1) Actual noise when tightening wood screws
The comparison data when tightening a wood screw (4.5 mm in diameter and 90 mm in length) into a cedar
workpiece are shown below. The data below are intended for reference purposes only because actual noise
will vary depending on the types of workpieces, hardness, etc.
Measuring conditions: (a) Wood screws (4.5 mm in diameter and 90 mm in length) and cedar
(dB)
98
96
94
92
90
88
86
(2) Actual noise when tightening bolts
Measuring conditions:
(dB)
98
96
94
92
90
88
workpieces
(b) Battery voltage 12 V, A-range, distance 1 m
(c) Average of tightening 5 screws
1.5
90.4
WH 12DM
(a) M12 bolts
(b) Battery voltage 12 V, A-range
(c) Average of tightening 5 screws
92.1
WH 12DM
--- 25 ---
2.4
93.6
WH 12DH
96.2
WH 12DH
(sec.)
3
2.5
2
1.7
1.5
1
91.3
0.5
0
C
96.1
C