2 Feb 2011 cultibot   » (Observer)

examples (and the limits) of design through imagination

At the beginning of March, 2009, two such ideas (designs or simulations running inside my head) had been taking up cerebral resources for some time, weeks or months, so, since they weren't going to be getting any better in the absence of something more tangible, either a CAD model or a mockup, neither of which I had time for, I decided to offload them to one of my blogs, in the hope that someone else might benefit.

The first is essentially the miniature equivalent of inserting an air hose through the tread of a tire at a very shallow angle, nearly tangent, to create a dust barrier via the resulting airflow, with the idea of using it to keep dust off of camera lenses and the like.

The second had its origin in the knowledge that the closer you get to the pivot point of a lever the more force is available. Applied to a robotic manipulator, this means that the outer tips of the 'fingers' should be more sensitive and delicate than segments closer to the 'wrist' (the point of attachment to the supporting arm). Conversely, it also means that those inner segments might be used where more force is needed, as in clipping through the stem of a woody shrub. Inconveniently, stems in need of clipping come at odd angles, so if a shear only operates in a single plane that plane may need to be rotated as much as 90 degrees in moving from one clipping to the next, which might require repositioning the entire machine, which could slow down the operation considerably. Giving the manipulator a set or semi-rotatable digits, that can pair in two different X-shaped configurations, 90 degrees opposed from each other, could provide as many as six shear planes without any rotation of the manipulator unit as a whole. This would allow a pruning robot to move from one clipping to the next with a simple repositioning of its digits.

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