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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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notes    
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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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![](video/SEQ-rct-add-blk-enc.mp4)

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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