All booms have this ability to flex so they can absorb the loading forces that come from lifting a heavy weight. It occurs when a crane is lifting a load and its boom appears to be bending. Hence if we consider an overhead crane having a length or span of 25000 mm, then its deflection limit would be equal to 27.8 mm.Ĭrane boom deflection is another phenomenon that happens to all cranes. How is overhead crane deflection calculated?įor enclosed track workstation overhead cranes, the deflection limit can be calculated using the term L/900 L is the length of the crane.

The crane has a lifting radius of 100 metres and the load capacity maxes out at 400 tons. The two highest measurements, 51′ EXT.Ībout the 500-Ton Crane With the largest reach, radius, and lift capacity of any mobile crane, the 500-ton crane has the potential to add value to any company seeking large-scale hoisting services. The arced lines extending from each of these measurements show the position of the boom at various lift angles. The measurements going up the right side of the chart note the boom length (in feet) at various levels of extension. How to Read a Crane’s Working Range Diagram. If you have a jib crane with an 8-foot (2.4 meter) boom and the manufacturer allows L/150, your measured maximum deflection at 100% of the crane’s rated capacity should be approximately 0.64 inches (16 mm) according to the formula /15=0.64 (2,400/150=16).Ĭapable of reaching a maximum working radius of 40 meters. This formula can be used with any unit of measurement. How do you calculate jib crane deflection?

Consider the hook height required with lifting equipment.

Allow for the height of obstructions between crane and load.

Determine clearance issues, either height under ceiling or overhead obstructions.

Calculate the maximum radius from the center of pin.

The distance is measured from the center pin of the crane to the center of the load. EXAMPLE: You need to lift a load of 15 tons (30,000 pounds) a distance of 25 feet. ‘ indicator on the left axis represents the radius, the distance from the center pin to the center of the load. 7 How is the weight of a crane determined?.6 Which is better horizontal jib or horizontal trolley jib?.4 How is overhead crane deflection calculated?.3 How do you read a crane range diagram?.2 How do you calculate jib crane deflection?.

Crane radius chart