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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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 - 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 

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### BOM
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### Hardware 

Type | Size | QTY | Where Used | McMaster PN
--- | --- | --- | --- | --- 
SHCS | M3 | 2.5mm Hex | 91292A110 
SHCS | M4 | 3mm Hex | 91292A116 
SHCS | M5 | 4mm Hex | 91292A124 

Type | Meaning
--- | --- 
SHCS | Socket Head Cap Screw: machine screws with hex heads in a 'socket' - i.e. the head is the socket, not the driver. 
FHCS | Flat Head Cap Screw: similar to SHCS but have triangular heads, used when making fastener surfaces flush.
BHCS | Button Head Cap Screw: rounded head socket heads !
PLSTCF | Plastic Thread-Forming Screws: have triangular lobed threads and torx drive caps, wonderful in plastics as the beefy threads mean no inserts required. 

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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)