Browsing by Subject "Process Control, Rod growth"

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    Trussed Structures: FreeForm Fabrication without the Layers
    (1997) Pegna, Joseph; Messia, David; Lee, Woo Ho
    Recent progress in 3D-LCVD have demonstrated the advantages ofrod micro-fabrication, both from the point of view of the range of volumetric deposition rates -from 1cl- to 109 cubic micron per second- andfrom the point ofview ofprocessable materials. A methodforfabricating trussed structures by LCVD ofethylene was tested, based upon scanning of the laserfocus perpendicular to the laser axis during rod growth. Control of the process is achieved though feedback ofthe laser power. A closed loop system was designed, which maintains a constant volumetric deposition rate during growth. Such capability, combined with previous results by the authors and other researchers in the field, open a new approach to free form fabrication without layers. Indeed, current results constitute a proofofconceptfor the fabrication oftruss structures akin to a finite element mesh.