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Prototyping Methods (Subtractive (Computer Numerical Control (How it…

- - - - A pre-programmed computer software that dictates the movement of the tools while it removes the material from a raw material
      - The process is programmable. textControl by NC program
    - - Desktop type
        
        Control Panel
        
        Cutting Tool
        
        Workpiece
    - - Manual Programming(Text File)
      - Can be generated from Computer Aided Manufacturing(CAM) System
        
        What is CAM?
        
        Machining path can be programmed in a CAM System
        
        Design done in CAD system can output to STL format, and use a CAM system to generate the tool-path and output to a NC program for CNC
        
        :Workflow
        
        <---CAD
        
        <--CAM
        
        2 more items...
    - - Advantages
        
        The process is programmable
        
        It can cut on hard-metallic material
        
        Smooth surface finish
      - Disadvantages
        
        Deciding how to hold the part on the machine table
        
        Work piece is held by a rotating chuck
        
        Work piece need to be "clamped"
        
        Deciding the depth of cut, the tool-bit size
        
        Limitation of tool-bit(cutter diameter) size to produce small details
        
        Not able to mill the whole design in one setup
- - - - Creating slices of the CAD file, cured by laser with liquid polymer
      - Elevating table, laser, liquid polymer(resin) components of SLA machine, VAT, building platform
      - Recoater System
      - Remove supports, cured in UV oven
  - - - A process which uses laser selectively to trace the surface of powder and sinters the material together
      - Advantages
        
        Self support during building
        
        Excess powder can be reuse
        
        Fast & high accuracy
        
        Many choices of material
    - - Uses Filament
        
        PLA(Polyactic Acid)
        
        Non-toxic
        
        Easy to print
        
        ABS
        
        Withstand higher heat
        
        Tougher than PLA