, is a critical document that specifies the maximum weight a crane can safely lift based on the horizontal distance between the crane's center of rotation and the center of the load. As the lifting radius increases, the crane's lifting capacity significantly decreases due to the increased leverage and tipping moment. Core Components of a Radius Chart A typical chart is structured as a grid where you cross-reference different variables to find the "Gross Capacity": Operating Radius (Horizontal Axis/Left Column): The horizontal distance from the center pin to the load's center of gravity. Boom Length (Top Row): The total extended length of the crane's arm. Boom Angle: The angle between the boom and the horizontal ground. Lower angles generally result in a larger radius and lower capacity. Gross Capacity: The total weight the crane is rated for at that specific intersection of radius and boom length. Calculating Net Capacity It is important to distinguish between "Gross Capacity" and what the crane can actually lift, known as
The you’re working with (Mobile, Tower, Crawler?) If you need help calculating rigging deducts crane radius chart
The angle of the boom relative to the horizontal ground. , is a critical document that specifies the
Locate the column that matches your current boom extension. Boom Length (Top Row): The total extended length
Before diving into the chart, let’s define the "radius."
Check for overhead obstructions or power lines within the boom's swing path. If you'd like to dive deeper, let me know: