63d960f8a5
Changed Buck converter from adjustable to 5V fixed to prevent accidental damage to the Pico
5.8 KiB
5.8 KiB
Bill of Materials (BOM)
Mechanics
| Name | Qty | Description | Comments | Suggested link | Image |
|---|---|---|---|---|---|
| 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 |  |
| Neodym Cylinder Magnet | 70 | Ø3mm h=5 mm | N52 Grade | NeoMagnets | |
| Brass Pipe | 1 m | OD=Ø2mm ID=Ø1 mm | Amazon |  |
|
| 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 | ||||
| Crimp Beads | 12 | Used to affix the ends of the PU cord |
Electronics
| Name | Qty | Description | Comments | Suggested link | Image |
|---|---|---|---|---|---|
| DC-DC Step Down Module | 1 | 5V Fixed Output Step-Down Buck Converter | Aliexpress |  |
|
| (1N5819) OR (PMEG4010) | 1 | Diode (through-hole or SMD) | |||
| Raspberry Pi Pico 2 | 1 | Microcontroller board |  |
||
| MT6835 Magnetic Encoder Module | 3 | Magnetic encoder | Aliexpress |  |
|
| TB6612FNG Driver | 3 | Aliexpress |  |
||
| 470 µF Electrolytic Capacitor | 3 | > 100 µF | anything > 100µF will work well | ||
| 10 µF Ceramic Capacitor 0603 | 3 | Optional | |||
| 4.7 k Resistor 0603 | 2 | Optional | |||
| NEMA 17 Stepper Motor | 3 | Body ≤ 38 mm | Body length <= 38mm | ||
| JST XH2.54 4P connector | 3 | 4P Housing & Header 2.54mm pitch | J1, J2, J3 (motors) | Aliexpress |  |
| XT60H Connector | 1 | 2P Male & Female pair 7.5mm pitch | Power connector | Aliexpress |  |
| PH2.0 4P Housing PH2.0 8P Housing |
1 1 |
4P 2mm pitch Housing 8P 2mm pitch Housing |
J5 (tool/I2C) J4 (encoders) |
Aliexpress |  |
| PH2.0 4P Header PH2.0 8P Header |
1 1 |
4P 2mm pitch Header 8P 2mm pitch Header |
J5 (tool/I2C) J4 (encoders) |
Aliexpress |  |
PCBs
| Name | Qty | Description | Comments | Image |
|---|---|---|---|---|
| Control Board | 1 | |||
| balljoint_plate_pcb | 6 |
3D Printing
| Name | Qty | Description | Comments | Image |
|---|---|---|---|---|
| Motor Horn | 3 | 0.4 mm+ nozzle may require post-processing |  |
|
| RubberBandCollet | 12 | 0.4 mm nozzle, 0.1mm Layer height + may require post-processing |  |
|
| Motor Mount | 3 |  |
||
| End Effector | 1 |  |
||
| Base Block | 1 |  |
Tool - Rod Sharpener
3D Printing
| Name | Qty | Description | Comments | Image |
|---|---|---|---|---|
| Rod Guide | 1 | |||
| Blade Carrier | 1 |
Tool - Rod Length Setting Press
PCBs
| Name | Qty | Description | Comments | Image |
|---|---|---|---|---|
| ball_alignment_disc_pcb | 1 |
3D Printing
| Name | Qty | Description | Comments | Image |
|---|---|---|---|---|
| RodGrindingJigA | 1 | |||
| RodGrindingJigB | 1 | |||
| RodGuide | 1 | |||
| RodCollet | 2 | |||
| CaliperClamp | 2 |