Reflatables: Tube-Based 3D Fabrication
This fabrication method uses hook-and-loop fasteners to create reconfigurable inflatable 3D shapes.
Inflatable structures maintain their form by air pressure inside, and are used in a variety of applications from playground equipment to soft robotics. One thing they all seem to have in common is that once a bounce castle or robo-hand is constructed via a sealing process, they’re pretty much stuck that way. But what if you need something different, or would like to experiment before making your soft-whatever permanent? Researchers in Japan may have the answer: Reflatables, a tube-based fabrication method for creating large-scale 3D objects.
Instead of a permanent sealing process, the objects here are shaped by the placement of hook-and-loop (i.e. Velcro) fasteners. These fasteners define bend points, allowing a variety of shapes to be made and changed as needed. They can even be stacked for more three-dimensional configurations. Shapes are designed in a conventional CAD package, and custom software is then used to define the position angle of these hook-and-loop fastener bend points.
To facilitate this experimentation, the researchers have developed a machine to help automate the attachment process. This machine consists of a series of rollers, controlled by an Arduino and motor shield to drive a stepper motor that properly folds and attaches the fasteners. This machine also implements a photoreflector sensor to read the black and white pattern on the inflatable tube for tracking.
Perhaps we'll see such a technique used in the future to help rapidly prototype novel inflatables!