Tech-dat/lens-dat/lens-phone-dat/lens-phone-dat.md
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+# lens-phone-dat
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+- common lens for phone == 17 mm
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+- [[thread-dat]]
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fab-dat/fab-product-dat/fab-3d-print-dat/fab-3d-print-dat.md
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![](2026-02-16-11-50-58.png)
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+- [[lens-dat]]
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## ref
mechanics-dat/CAD-dat/onshape-dat/2026-02-21-18-52-23.png
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mechanics-dat/CAD-dat/onshape-dat/onshape-dat.md
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+## custom features
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+![](2026-02-21-18-52-23.png)
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+- [[thread-dat]]
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## relevant
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- [[ALU-extrusion-dat]] - [[Alu_Extrusion-dat]]
mechanics-dat/mechanical-structure-dat/thread-dat/2026-02-21-19-04-05.png
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mechanics-dat/mechanical-structure-dat/thread-dat/thread-dat.md
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# thread-dat
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+1. The "Rule of Three" Threads
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+For a secure connection in engineering, it is standard practice to have at least 3 full thread rotations engaged.
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+If the pitch is 1.0mm: You need a minimum of 3.0mm thickness.
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+If the pitch is 0.75mm: You need a minimum of 2.25mm thickness.
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+## thread pitch
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+For a 17mm mounting plate, **1.0mm (Fine Pitch)** is the superior choice over 2.0mm.
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+| Feature | 1.0mm (Fine) | 2.0mm (Coarse) |
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+| :-------------------- | :------------------------------------ | :----------------------------------- |
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+| **Thread Engagement** | **High** (3-5 threads in a 4mm plate) | **Low** (1-2 threads in a 4mm plate) |
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+| **Security** | Better resistance to vibration | Higher risk of stripping |
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+| **Compatibility** | **Standard** for mobile optics | Non-standard for this size |
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+![](2026-02-21-19-04-05.png)
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+## counterbore VS countersink
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## Metric & Imperial Systems
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-| Standard | Name | Angle | Region |
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-|--------|------|-------|--------|
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-| ISO Metric | Metric Thread (M) | 60° | Worldwide |
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-| Unified | UNC / UNF / UNEF | 60° | USA |
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-| Whitworth | BSW / BSP | 55° | UK |
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-| Pipe Thread | NPT / BSPP / BSPT | 60° / 55° | Piping |
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+| Standard | Name | Angle | Region |
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+| ----------- | ----------------- | --------- | --------- |
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+| ISO Metric | Metric Thread (M) | 60° | Worldwide |
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+| Unified | UNC / UNF / UNEF | 60° | USA |
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+| Whitworth | BSW / BSP | 55° | UK |
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+| Pipe Thread | NPT / BSPP / BSPT | 60° / 55° | Piping |
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---
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## 3️⃣ Metric Thread Details (ISO)
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-| Property | Description |
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-|--------|-------------|
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-| Designation | M6 × 1.0 |
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-| Major Diameter | Nominal outer diameter |
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-| Pitch | Distance between threads |
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-| Thread Angle | 60° |
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-| Direction | Right-hand / Left-hand |
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+| Property | Description |
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+| -------------- | ------------------------ |
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+| Designation | M6 × 1.0 |
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+| Major Diameter | Nominal outer diameter |
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+| Pitch | Distance between threads |
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+| Thread Angle | 60° |
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+| Direction | Right-hand / Left-hand |
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### Common Metric Threads
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| Size | Pitch (mm) |
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-|----|-----------|
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-| M3 | 0.5 |
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-| M4 | 0.7 |
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-| M5 | 0.8 |
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-| M6 | 1.0 |
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-| M8 | 1.25 |
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+| ---- | ---------- |
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+| M3 | 0.5 |
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+| M4 | 0.7 |
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+| M5 | 0.8 |
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+| M6 | 1.0 |
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+| M8 | 1.25 |
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+## ref
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+- [[CAD-dat]]
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