How to Make Almost Anything: The Digital Fabrication Revolution


A new digital revolution is coming, this time in fabrication. It draws on the same insights that led to the earlier digitizations of communication and computation, but now what is being programmed is the physical world rather than the virtual one. Digital fabrication will allow individuals to design and produce tangible objects on demand, wherever and whenever they need them. Widespread access to these technologies will challenge traditional models of business, foreign aid, and education.

The roots of the revolution date back to 1952, when researchers at the Massachusetts Institute of Technology (mit) wired an early digital computer to a milling machine, creating the first numerically controlled machine tool. By using a computer program instead of a machinist to turn the screws that moved the metal stock, the researchers were able to produce aircraft components with shapes that were more complex than could be made by hand. From that first revolving end mill, all sorts of cutting tools have been mounted on computercontrolled platforms, including jets of water carrying abrasives that can cut through hard materials, lasers that can quickly carve fine features, and slender electrically charged wires that can make long thin cuts.

Today, numerically controlled machines touch almost every commercial product, whether directly (producing everything from laptop cases to jet engines) or indirectly (producing the tools that mold and stamp mass-produced goods). And yet all these modern descendants of the first numerically controlled machine tool share its original limitation: they can cut, but they cannot reach internal structures. This means, for example, that the axle of a wheel must be manufactured separately from the bearing it passes through.

In the 1980s, however, computer-controlled fabrication processes that added rather than removed material (called additive manufacturing) came on the market. Thanks to 3-d printing, a bearing and an axle could be built by the same machine at the same time. A range of 3-d printing processes are now available, including thermally fusing plastic filaments, using ultraviolet light to cross-link polymer resins, depositing adhesive droplets to bind a powder, cutting and laminating sheets of paper, and shining a laser beam to fuse metal particles.

Businesses already use 3-d printers to model products before producing them, a process referred to as rapid prototyping. Companies also rely on the technology to make objects with complex shapes, such as jewelry and medical implants. Research groups have even used 3-d printers to build structures out of cells with the goal of printing living organs.


Author:
Neil Gershenfeld

Source and Full Article:
http://cba.mit.edu/docs/papers/12.09.FA.pdf
 

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