When using load/capacity charts, what does the term "jib angle to ground" refer to?

The term "jib angle to ground" refers to the angle formed between the jib and the horizontal plane of the ground, particularly considering how the jib is positioned relative to the main boom. This angle is significant because it affects the lifting capacity and the stability of the crane when performing lifts.

When calculating the jib angle to the ground, the correct approach involves understanding the relationship between the main boom and the jib, specifically how the jib is offset from the main boom. The main boom angle is taken as a reference, and to determine the jib's effective angle relative to the ground, the jib's offset is subtracted. This adjustment is critical for accurately determining the crane's load capacity at various configurations and ensuring safe operation.

So, when assessing the load/capacity charts, it is essential to accurately represent this relationship. By subtracting the jib’s offset from the main boom angle, operators can ensure they are looking at the correct configuration for lifting operations, promoting both safety and efficiency in crane use.