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(4) Comparison of hammer and number of strokes
Thanks to the larger hammer (higher hammer inertia J) than the previous model, the number of strokes (N) of
the Model WR 12DM is increased. As a guide, stroking force is proportional for J X N
2
J X N
of the Model WR 12DH is 100, the J X N
Model WR 12DH as shown in the table below.
Model
Voltage
Outside diameter of hammer (D)
Height of hammer (H)
Hammer inertia J
Number of strokes (N)
2
J x N
WR 12DM
Unit
V
mm
mm
2
kgmm
min
-1
(No. of strokes/min.)
%
2
of the Model WR 12DM is about 1.5 times larger than the
WR 12DH
WH 12DM
12
42.6
20
37.4
3140
150
--- 13 ---
2
. Therefore, when the
C
C
WR 12DM
12
12
42
39.5
16.5
21
31.7
28.8
3070
2900
100
120
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