Just as Net Pay is what you get to spend, Net Capacity is what’s leftover that you can actually lift. Then there are taxes, insurance, and other deductions that leave them with their Net Pay. When teaching this concept to students, I compared it to their paycheck. The maximum weight of the load cannot exceed the net capacity. Net Capacity equals gross capacity minus all lifting deductions (rigging and attachments). Net capacity is calculated by reducing the value found on the load chart by the weight of the rigging and added attachments. Net Capacity: The maximum weight that can be lifted. This corresponds to the value found on the load chart. Gross Capacity: The maximum weight that a machine is designed to lift, which includes the load, attachments, and all rigging.
Load Radius: The distance from the center of rotation of the digger derrick to the center of gravity of the load. To begin, below are some important terms every digger derrick operator must understand. The rated capacity will be different depending on where in the load chart you are working, how many parts of line are used, and other factors such as type of rope installed. Such boom position factors include load radius, boom length, boom angle, and other parameters of use. The rated capacity of the digger derrick is the maximum working load permitted by the manufacturer for the boom configuration and boom position. If additional options are added to the digger derrick that increase the weight of the booms, a new load chart must be created to account for this additional weight. The load chart for that unit takes into consideration all the options installed on the boom when the digger derrick was built. While load charts are affixed to the device in view of the operator near the controls, it is critical to always verify that the serial number on the load chart matches the serial number of the unit. The nature of the industry is that digger derrick capacities are directly affected by the chassis the digger derrick is mounted on, where it is mounted, the options and accessories the digger derrick is equipped with. That means that just because you have more than one Terex Commander 4042 in your fleet, the same load chart may not be used for both units. An important part of the overall written exam score relates to load charts.ĭigger derricks load charts are designed specifically for the unit serial number of the unit. Applying this knowledge will help with safe operation of the equipment and taking the written test to become a CCO-certified digger derrick operator. In many ways, digger derricks are similar to cranes with telescoping and rotating booms, jibs and other attachments, and winches with load lines that can be configured with multiple parts of line. Just like when operating cranes, understanding how to read load charts, and applying that information to the operation of a digger derrick is critical.
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