Calculating The Hook Load - Greenlee 639 Instruction Manual

Hook Load (cont'd)

Calculating the Hook Load

One Attachment Point
To calculate the hook load exerted at one attachment
point, use the Reference Table and Formula 1.
Formula 1:
R = 2 x T x SIN [(180 – θ) / 2]
R = the resultant force, or hook load; this force is exerted on the hook, anchoring and structural support
θ = the angle of change in rope direction
T = the tension exerted on the rope by the cable puller
Note: The total load on the support structure = R + the weight of the sheave.
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Sheave with One Attachment Point
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