CAID Industries in Tucson is responsible for several main structural components of LSST including the M1M3 weldment (earlier story here). At this point, CAID has begun final phase of M1M3 Cell machining. This final phase breaks down the the 4400 mirror support system's interface features on the deck plate into multiple machining zones. This manufacturing technique allows machined features to be precisely located by utilizing a laser tracker and a 3-axis CNC controlled machining head. In this short video, the DePMaS (Deck Plate Machining System) is mounted directly onto the M1M3 Cell and engraving the LSST logo on a sample piece of material.