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Movable Work Platforms

While he was Principal Chief Engineer at Hamilton Engineering, Gil Lund was responsible for the design, building and installation of many work platforms used by Boeing final assembly personnel.


The original 747 final assembly platforms were built in the late 1960s and the lift leveling system consisting of four hydraulic cylinders never worked well. In 1984 Hamilton Engineering was given the design task to improve the system. The cylinders were replaced by new units using four Temposonic linear position sensors. The hydraulic system was modified with four independent proportional valves connected by a closed servo loop to the linear sensors. The required electronic controller was developed specifically for this application since at that time no off the shelf control or software was readily available. The system installed in 1984 is still in daily operation without any major changes.

As a result of the successful rebuild of the 747 platforms Hamilton Engineering was given the task of designing, building, testing and installing the six new 777 final assembly platforms. These platforms are much larger than the 747 version and are operated by mechanical screw jacks. All the platforms are currently in daily operation and there have been no service issues since the original installation.

When Boeing decided they would need a new paint hangar for the 777, Hamilton Engineering was tasked with design, build and testing of the facility personnel access platforms. The hydraulic lift scissor jacks needed for the very low profile vertical lift wing platforms was a significant design challenge. The custom scissor lift designed for the tail platform probably is one of the largest scissor lifts in existence.