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Byline: R. David Hampton, Naveed Quraishi, Geoffrey S. Beech Boeing's active rack isolation system (ARIS) isolates microgravity space-science experiments on the international space station (ISS) against station-induced disturbances, at the level of the international standard payload rack (ISPR). Part 1 of this documentation presented a linearised model of ARIS, hand-developed via Kane's method. Part 2 reported the use of software packages to develop and verify a corresponding non-linear model, without umbilicals. Part 3 documented the augmentation of the non-linear model with an arbitrary number of umbilicals, with specified arbitrary attachment points, and arbitrary (parallel) stiffnesses and dampings. Part 4 reviews the general model-development procedure; reports on the reformulation of the model into a standard, linearised, input-coupled, state-space (descriptor) form, with all bias-force and -moment terms removed; summarises the significant features of the completed model; and discusses its possible uses in support of future microgravity vibration-isolation efforts.

A trim-and-drill tool, developed by researchers at the DOE's Oak Ridge National Laboratory (ORNL), Tenn., was named the largest solid 3D-printed item by Guinness World Records. Measuring 17.5 x 5.5 [...]

Boeing is using the Mini Flex Track, which is a two-axis numerically controlled (NC) positioning system that complements Flex Track in drilling 787's test fuselage areas. The system features a simple user interface for minimal operator training and a multiple access controller. Other details about the positioning system are discussed.

Use of small-diameter cutting tools such as Precise Corp.'s electric spindles and Ingersoll Milling Machine's CNC drills (which use the Precise spindles) in making aircraft parts is discussed.