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78 lines
3.2 KiB
Markdown
78 lines
3.2 KiB
Markdown
# nakamochi 3D designs
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the repo contains 3D models of parts used in the nakamochi project.
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those design sources which are made with [freecad](https://freecad.org/)
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use a version no older than v0.20. a stock installation of freecad should
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be sufficient but you might want to install
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[fasteners workbench](https://wiki.freecadweb.org/Fasteners_Workbench) if working on
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a design assembly.
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there are currently designs only for the [NERD edition](https://nakamochi.io/#nerd).
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KAFI version is coming later on. generated files like STL, STEP and DXF are attached
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to their respective releases on https://git.qcode.ch/nakamochi/3d/releases
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## NERD edition
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this version features a custom heatsink combined with the bottom plate, suitable
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for aluminium CNC milling. the construction provides a good heat dissipation,
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making an active cooling like a fan redundant.
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<img alt="NERD temperature during IBD" src="nerd/ir_1166.jpg" align="right">
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the baseplate serving as a heatsink brings down the main CPU temperature
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from around 70℃ to 50℃. when measured externally while doing bitcoin initial
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blocks download, an IR camera showed around 36℃.
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the main file [nerd.FCStd](nerd/nerd.FCStd) contains all parts
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as well as the assembly. a complete assembly BOM is as follows.
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**off the shelf parts**
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- [raspberry pi 4 model b][rpi4]
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- [waveshare 4.3inch DSI LCD][lcd]
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- [sandisk portable 1TB SSD sdssde30-1t00][ssd]
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- 90 degree angle [USB-C adapter][usbc90deg] 3.1 gen 2, 10Gbps
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- adhesive gasket/seal tape for LCD, 1mm thick, 10mm width, L370mm
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- 3 thermal pads 1.5mm thick, 424mm sq total area - see baseplate drawing
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- 7 screws M2.5 L10mm
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- 4 adhesive bottom pads Ø5mm, 3mm+ thick
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[rpi4]: https://www.raspberrypi.com/products/raspberry-pi-4-model-b/
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[lcd]: https://www.waveshare.com/wiki/4.3inch_DSI_LCD
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[ssd]: https://www.westerndigital.com/en-in/products/portable-drives/sandisk-usb-3-2-ssd
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[usbc90deg]: https://www.delock.de/produkt/65915/merkmale.html
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other parts, harvested from the above list:
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- 2 self-tapping screws 2.9mm L3mm (from the SSD)
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- 1 screw M2.5 L5mm (from the LCD)
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- 4 PCB standoffs M2.5 L30mm (from the LCD)
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**custom parts**
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- CNC milled aluminium baseplate (look for `baseplate_techdraw_c.pdf` in releases)
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- 3D-printed enclosure box (look for `box.stl` in releases)
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- 3D-printed SSD support plate (look for `ssdsupport.stl` in releases)
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- 3 Ø3mm hole 2.4mm thick spacers (use `spacer_3x2.4mm.stl` for 3D-print)
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> TODO: assembly instructions
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## assets
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various files are placed in the [assets](assets/) to use in an assembly composition.
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for example, you'll find a 4.3inch display, raspberry pi 4 and a heatsink in there.
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when creating a design assembly, make a new [std part](https://wiki.freecad.org/Std_Part)
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group and import desired assets into it. if an asset is in a freecad file format,
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open the file and drag&drop the top level object into the newly created std part.
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then close the original file ignoring the changes.
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## license
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[CC-BY 4.0](https://creativecommons.org/licenses/by/4.0/)
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