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Using metal-coated atomic force microscope (AFM) tips and single-walled carbon nanotube (SWNT) BuckyPaper films, the authors have successfully explored the feasibility of electro-machining (EM) at the nanometer scale. Highly ordered pyrolytic graphite (HOPG) and thin metal films were used as a substrate (workpiece) and metal-coated (Cr/Au) Si AFM tips and BuckyPaper films were used as electrodes. A negative voltage pulse was applied to the AFM tip to fabricate holes as small as 30 nm in diameter on the HOPG surface. Using SWNT BuckyPaper films, the submicron holes were fabricated on a metal surface, demonstrating that SWNTs can work as electrodes.Copyright © 2006 by ASME

In this research, the mechanism of material removal in green machining of unsintered tungsten alloy (W-Ni-Fe) was explored via orthogonal cutting. Parameters related to tool design (e.g. forces, stresses, and energy required during material removal processes at different settings) were calculated and compared. Dimensional integrity of production machining in pre-sintered tungsten alloy was also investigated via drilling and end-milling. The results, then, were compared with the conditions after sintering. Statistical analyses were used to quantify and explain the relationships among potential parameters. This research utilizes designed experiments and data analyses to investigate the material removal mechanism in green machining and the dimensional integrity of production machining pre-sintered tungsten alloy versus its status after sintering.Copyright © 2004 by ASME