Greenlee G6 Operación Manual página 17

Cable Pulling Principles (cont'd)
Cable Pulling Forces (cont'd)
At the Sheaves
Sheaves are used to change the direction of the pull.
A change in direction creates a new resultant force
that may be greater than the cable puller's maximum
pulling force. This new resultant force exerts itself on the
sheaves, sheave anchoring system, and support struc-
tures illustrated.
The resultant amount of force depends on the angle of
the change in direction. A brief table is provided here;
For details on calculating the resultant force for any
angle, refer to IM 1363 (99929988).
Greenlee / A Textron Company
Resultant Force Table
(6000 lb or 26.7 kN Pulling Force)
Resultant Force
4600 lb (20.4 kN)
Typical Resultant Force at Sheave
17
Angle of Change
Illustration
in Direction
180°
150°
135°
120°
90°
60°
45°
30°
0°
135°
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G6 Turbo
Resultant Force
in lb (kN)
0 (0)
3100 (13.8)
4600 (20.4)
6000 (26.7)
8500 (37.8)
10,400 (46.3)
11,100 (49.3)
11,600 (51.6)
12,000 (53.4)