The disclosure generally relates to a locating assembly as a component of a locating table segment for positioning truss segments in a truss assembly system. The system generally includes a plurality of table segments aligned in parallel and adapted to position a series of locating blocks on a top surface of the system/table, where each block is a component of one of a plurality of locating assemblies in the system. The block positions collectively define an outer boundary of a support truss (e.g., as a roofing truss). Once the blocks are moved to their desired position, appropriately sized truss segments are placed within the block-defined boundary and fastened together.