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added correct fasteners

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Alan Han 2026-03-24 19:29:09 -04:00
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commit 79ee7a67e9
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documentation/bom/bom.md
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# Bill of Materials (BOM)
## Mechanics
| Name | Qty | Description | Comments | Suggested link | Image |
|------|-----|-------------|----------|----------------|-------|
| Steel ball | 12 | Ø1.25 mm (0.05") | Precision G10 or better. Can be sourced from small ball bearings | |
| Steel ball | 12 | Ø1 mm (0.04") | Precision G10 or better. Can be sourced from small ball bearings | |
| PU stretch cord | 1 m | Ø1mm | e.g. "Stretch Magic" or "Magic String" | [Aliexpress](https://www.aliexpress.us/item/3256805953910514.html)| ![Pu strech cord](images/PU_StretchCord.png)|
| Neodym Cylinder Magnet | 70 | Ø3mm h=5 mm | N52 Grade | [Ebay Link]()|
| Brass Pipe | 1 m | OD=Ø2mm ID=Ø1 mm | | [Amazon](https://a.co/d/1pRFmtf)| ![Brass Pipe](images/BrassPipe.png)|
| M2 Screw | 12 | M2×12 mm, Countersunk | | |
| M3 Grub Screw | 6 | M3×4 | | |
| M2-8 dowel | 9 | | | | |
| SHCS M2-8 | 9 | | | | |
| Set Screw M3-6 | 3 | | | | |
| FHCS M3-6 | 3 | | | | |
| FHCS M3-10 | 9 | | | | |
| FHCS M3-20 | 12 | | | | |
## Electronics
| Name | Qty | Description | Comments | Suggested link | Image |
|------|-----|-------------|----------|----------------|-------|
| DC-DC Step Down Module | 1 | 4.75–23 V Step-Down Buck Converter | | [Aliexpress](https://www.aliexpress.us/item/3256806752772875.html)| ![DC-DC Step Down](images/DC_DC-StepDown.png)|
@ -25,13 +31,15 @@
| 4 Pin Header | 4 | 2.5 mm pitch | | |
| 8 Pin Header | 1 | 2.0 mm pitch | | |
| NEMA 17 Stepper Motor | 3 | Body ≤ 38 mm | Body length <= 38mm | |
## PCBs
| Name | Qty | Description | Comments | Image |
| ------------------- | --- | ----------- | -------- | ----- |
| Control Board | 1 | | | |
| balljoint_plate_pcb | 6 | | | |
## 3D Printing - Machine
## 3D Printing
| Name | Qty | Description | Comments | Image |
| ------------------- | --- | ----------- | --------------------------------------------------------------- | -------------------------------------------------- |
@ -42,6 +50,7 @@
| Base Block | 1 | | | ![Base Block](images/BaseBlock.png) |
# Tool - Rod Sharpener
## 3D Printing
| Name | Qty | Description | Comments | Image |
@ -52,9 +61,11 @@
# Tool - Rod Length Setting Press
## PCBs
| Name | Qty | Description | Comments | Image |
| ----------------------- | --- | ----------- | -------- | ----- |
| ball_alignment_disc_pcb | 1 | | | |
## 3D Printing
| Name | Qty | Description | Comments | Image |