Description
Overview
Spinjig automates the tedious part of speaker measurement: rotating the speaker accurately, again and again, for a full set of polar responses. It rotates in precise steps synced to REW so a spinorama can be captured hands-free.
The printed cross-roller bearing running on airgun BBs is the heart of it — cheap, surprisingly smooth, and stiff enough for a 15 kg speaker.
What it enables
- Repeatable angles for valid before/after comparisons
- Hands-free polar captures — no nudging the speaker between sweeps
- A homing switch so every session shares the same zero reference
Specifications
| Step resolution | 10 ° (configurable) |
|---|---|
| Payload | 15 kg max |
| Drive | NEMA 17 + belt 5:1 reduction |
|---|---|
| Control | Microcontroller REW-triggered |
Bill of Materials
| Component | Qty | Unit | Unit Price | Total | Notes | Buy |
|---|---|---|---|---|---|---|
| NEMA 17 stepper + driver | 1 | €18.00 | €18.00 | |||
| Microcontroller board | 1 | €8.00 | €8.00 | |||
| GT2 belt + pulleys + bearings | 1 | €16.00 | €16.00 | |||
| Airgun BBs (bearing balls) | 1 | €6.00 | €6.00 | |||
| PETG filament | 1 | €20.00 | €20.00 |
Build Guide
Print the turntable and base
2 days print- Print the bearing race slowly — a smooth race is the difference between repeatable and jittery angles.
Build the drive
3 hSync to REW
4 h- Add a homing switch so every session starts from the exact same zero angle.
Calibrate and verify
2 hDiscussion
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