Let's take a concrete example. Picture a telecom factory producing fiber optic modems. The assembly line includes a
workbench where workers install circuit boards, a
roller track that feeds components to the bench, and a material rack holding spare parts. Traditionally, each of these elements would be bolted or welded together with rigid joints. If the modem design changes—say, the circuit board grows by 2 inches—the
workbench surface needs to widen. With old steel joints, this would mean removing the entire bench top, cutting new steel pipes, welding new joints, and repainting to prevent rust. With the 90° external aluminum joint, the process is drastically simpler. The
workbench's frame is built with aluminum lean pipes connected by these joints. To widen the bench, workers loosen the bolts on the 90° joints, add an extra section of
aluminum profile to the frame, and re-tighten. The whole process takes under an hour, not a full day. The
roller track, too, benefits. Its aluminum guide rails are connected using the same 90° joints, allowing quick adjustments to the track's width or slope. Even the material rack, with its rows of shelves, can be reconfigured by adjusting the joints to hold taller or shorter component boxes. It's this level of integration—across workbenches, roller tracks, and racks—that turns individual components into a cohesive, adaptable
lean system.