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    # Roller Coaster Gantries
    
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    Parametric, low-complexity fabrication linear axis designs using ubiquitous hardware.
    
    ## Gantry for NEMA23 Motor, 1/4" Aluminum
    
    ![RCTN23-025ALU](images/RCTN23-025ALU.png)
    
    [RCTN23-025ALU Fusion CAD File](cad/RCTN23-025ALU_v49.f3d)
    
    
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    ![](video/SEQ-fusion-parametric-enc.mp4)
    
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    In Fusion[^2], you can open this file up and use (from the top menu)
    
    ``` Modify >> Change Paremeters ```
    
    Each of these models should have some parameters *starred*, these are what you'll want to configure. Go ahead and set axis lengths, material thicknesses according to what you're doing. When you're satisfied, you can export the model as a .step file, using the file menu, to prep it for fabrication.
    
    ``` File >> Export ``` 
    
    Make sure to change 'type' to .step, and check the 'save to my computer' box. 
    
    
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    ### N23 / 0.25" ALU Hardware 
    
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    Type | Size | QTY | Where Used | McMaster PN
    --- | --- | --- | --- | --- 
    SHCS | M3 | 2.5mm Hex | 91292A110 
    SHCS | M4 | 3mm Hex | 91292A116 
    SHCS | M5 | 4mm Hex | 91292A124 
    
    
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    ### N23 / 0.25" ALU Tools 
    
    Tool | Where Used | McMaster PN or Link
    --- | --- | ---
    M3 Tap | Extensively | 
    
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    ## 90 Degree Block for 1/4" Aluminum 
    
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    ![RCTBLK-90-025ALU](images/RCTBLK-90-025ALU.png)
    
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    [RCTBLK-90-025ALU Fusion CAD File](cad/RCTBLK-90-025ALU_v6.f3d)
    
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    # REF
    
    Find [Open Assemblies Hardware Reference](https://github.com/jakeread/openassemblies/blob/master/hardware.md) for shorthands etc. 
    
    # Jake's Notes
    
     - doc
      - bom
      - hardware callout drawing (probably more useful than video)
    
     - nice to include a note on what those flexures are up to ... and some other design decisions 
     - kinematic mounts are three button head cap screws on 20mm grid w/ reciprocal / wherever-u-like mount ins 
     - all axis have scroll-along top plate w/ connection to motor plate, final scroll kinematic triangle 
     - all axis have scroll-along bottom beam plate w/ 20mm grid w/ last scroll kinematic triangles