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Additive Manufacturing (DRY process (Fused Deposition Modelling (FDM)…

- - - - An ultraviolet light is generated that solidifies focused surface areas of the photopolymer
        
        A cross-section is traced on the surface of the liquid resin by the laser
        
        Servomotors drive a set of mirrors that reflect the laser beam to the surface of the polymer material
        
        the cross-section then gets recoated
        
        possible scenario to add support
        
        ceiling
        
        island
        
        ceiling with an arch
        
        gussets
- - - - ABS
        
        can withstand heat
        
        tougher than PLA
        
        prone to warping
      - PLA (Polyactic Acid)
        
        Non-toxic
        
        Easy-to-print with minimum warping or curling
    - - Need of support
      - Bridge
      - horizontal hole
    - - Polyject printer combines the technology of FDM with liquid photopolymer
      -  Is similar to a standard Inkjet printer filament, it deposit liquid plastic
      -  Instead of extruding melted
      -  It allows multiple material to be printed at each layer
  - - - PC with WINDOW OS
      -  Prepares the .STL files
      -  Slices the parts
      -  Monitors and controls the entire building process
    - - Houses the equipment to filter gas recirculated from the process chamber
      -  Maintains a set temperature on the air flowing into the process chamber
      -  Regulates the nitrogen atmosphere used in the unit
    - -  Accuracy is 0.015 in., depending upon the material.
      -  Almost any material that softens and decreases in viscosity upon heating can theoretically be selectively sintered
      -  egABS , PVC, nylon, investment casting wax, and polycarbonate
      -  powdered metals, ceramics, and advanced composite powders with suitable binders
      -  New materials such as stainless steel for SLS are currently being developed
      -  Ability to provide self support during building.
      -  Un-sintered powder surrounding the part in the build cylinder acts as a natural support for the next layer (except for metal powder)
      -  No elaborate supports need to be built such as in some photopolymer systems
      -  Excess powder material can be returned to the powder feed catridges for reuse
      -  Part building speed of 0.4 to 2 in./hour for a part with 0.005 in. layer thickness