Crane - Radius Chart

The horizontal distance from the center of rotation to the load's center of gravity. Boom Length: The total length of the extended boom.

Look at the vertical axis (Y-axis) of the chart, which usually represents . Find the boom length required to reach your target.

Reading these charts can be intimidating at first glance—they look like a mix of a graph and a math test. Here is a simple 4-step process to master it: crane radius chart

High winds exert side pressure on the boom and the load, creating unpredictable stresses.

The is the horizontal distance from the center pin (the axis of rotation) of the crane to the center of gravity of the load being lifted. Think of it as the length of the shadow the boom would cast on the ground if the sun were directly overhead. The horizontal distance from the center of rotation

Always use the exact chart for the specific crane model and serial number.

The angle of the boom relative to the horizontal ground. Find the boom length required to reach your target

Subtract the weight of the "deducts" (hook block, rigging, headache ball, and stowed jib) from the gross capacity to find how much actual payload you can lift. Factors That Affect Chart Accuracy