Tech-dat/acturator-dat/motor-dat/motor-dat.md
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@@ -190,7 +190,7 @@ more comprehansive Brushed vs. Brushless DC Motors
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## apps
192 192
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-- [[vacuum-cleaner-dat]] - [[robot-dat]]
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+- [[vacuum-cleaner-dat]] - [[robot-dat]] - [[roller-dat]]
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app-dat/roller-dat/roller-dat.md
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@@ -34,7 +34,13 @@ Since 775 motors are high-speed/low-torque, a gear reduction is mandatory:
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If your budget allows, a **Brushless DC (BLDC) Hoverboard Motor** is much better for carrying humans. They have internal Hall sensors and much higher torque without needing gears.
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36 36
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+## tech
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+
39
+- [[alu-extrusion-dat]]
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## ref
39 42
40
-- [[robot-dat]] - [[robotics-dat]] - [[RC-dat]] - [[roller-dat]] - [[motor-dat]]
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\ No newline at end of file
0
+- [[robot-dat]] - [[robotics-dat]] - [[RC-dat]] - [[roller-dat]] - [[motor-dat]]
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+
2
+
3
+- [[roller]]
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\ No newline at end of file
mechanics-dat/mechanical-parts-dat/bearing-dat/bearing-dat.md
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@@ -2,6 +2,11 @@
2 2
# bearing-dat
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4 4
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+- [[bearing-pillow-dat]] - [[bearing-dat]]
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+
7
+
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+
9
+
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## 6202 / 6302
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## 6201-2RS / 6301 Bearing Specifications
mechanics-dat/mechanical-parts-dat/gear-dat/gear-dat.md
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@@ -3,7 +3,9 @@
3 3
4 4
5 5
6
-- [[RPM-dat]] - [[physics-dat]] - [[gear-dat]] - [[Sprocket-dat]]
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+- [[RPM-dat]] - [[physics-dat]] - [[gear-dat]] - [[Sprocket-dat]] - [[wheel-dat]]
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+
8
+- [[chain-dat]]
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9 11
## gear ratio
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@@ -18,6 +20,32 @@ Common Combinations:
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20 22
23
+## Small Wheel Bicycle Drivetrain Specifications (12" - 16")
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+
25
+For small-diameter wheels, the gear ratio is designed to balance pedaling effort with the shorter distance traveled per wheel revolution. Most bikes in this category use a **Single-Speed Freewheel** system.
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+
27
+---
28
+
29
+#### 1. Typical Tooth Counts by Wheel Size
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+
31
+| Wheel Size | Front Chainring (Teeth) | Rear Cog (Teeth) | Gear Ratio | Purpose |
32
+| :--- | :--- | :--- | :--- | :--- |
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+| **12-inch** | **24T - 26T** | **16T** | 1.50 - 1.62 | Maximum torque for toddlers/beginners. |
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+| **14-inch** | **28T** | **16T** | 1.75 | Balanced ratio for neighborhood riding. |
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+| **16-inch** | **28T - 32T** | **16T or 18T** | 1.77 - 2.00 | Higher top speed for older children. |
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+
37
+---
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+
39
+#### 2. Component Anatomy
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+
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+
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+
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+* **The Rear Cog (The Driven Sprocket):** * **Standard Size:** 16T is the industry default.
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+ * **Thread Type:** Most use a standard 1.375" x 24 TPI (Threads Per Inch) interface, allowing you to swap cogs easily.
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+* **The Front Chainring (The Drive Sprocket):** * Larger wheels require more teeth on the front to prevent "ghost pedaling" (where the legs move too fast for the speed of the bike).
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+* **The Chain:** * Standard small bikes use a **1/2" x 1/8"** chain (wider than multi-speed chains).
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+
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+
21 49
## ref
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23 51
- [[motor-dat]]
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\ No newline at end of file
mechanics-dat/mechanical-parts-dat/hook-crane-dat/2026-02-28-23-50-49.png
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mechanics-dat/mechanical-parts-dat/hook-crane-dat/hook-crane-dat.md
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@@ -0,0 +1,12 @@
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+
2
+# hook-crane-dat
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+
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+Crane Hook: 起重机吊钩（最常用，指安装在起重机或葫芦上的钩子）。
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+
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+![](2026-02-28-23-50-49.png)
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+
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+- [[tube-dat]]
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+
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+## ref
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+
12
+- [[crane-dat]]
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\ No newline at end of file
mechanics-dat/mechanical-parts-dat/wheel-dat/2026-03-01-00-14-25.png
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mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-dat.md
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@@ -30,11 +30,20 @@
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+## wheel front == Driven Wheel / Idler Wheel
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+![](2026-03-01-00-14-25.png)
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+wheel without motor
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+
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+bearing 6302
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+
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+![](2025-04-03-15-42-28.png)
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+
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-## wheel with motor
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+
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+## wheel with motor / rear wheel == Driving Wheel
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39 48
mostly used for balancer kart, electric go-kart, and electric tri-cycle,
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@@ -48,12 +57,9 @@ mostly used for balancer kart, electric go-kart, and electric tri-cycle,
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12-inch 3000W 18-shaft + Mingzhe semi-molten tire
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+## wheels with hub
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-## wheel without motor
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-
54
-bearing 6302
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-
56
-![](2025-04-03-15-42-28.png)
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+- [[wheel-hub-dat]]
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58 64
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## ref
mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-hub-dat/2026-02-28-23-53-13.png
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mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-hub-dat/2026-02-28-23-54-06.png
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mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-hub-dat/2026-02-28-23-55-03.png
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mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-hub-dat/2026-02-28-23-55-19.png
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mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-hub-dat/2026-02-28-23-56-00.png
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mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-hub-dat/2026-02-28-23-56-37.png
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mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-hub-dat/2026-03-01-00-11-42.png
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mechanics-dat/mechanical-parts-dat/wheel-dat/wheel-hub-dat/wheel-hub-dat.md
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@@ -1,10 +1,64 @@
1 1
2 2
# wheel-hub-dat
3 3
4
-- [[wheel-dat]] - [[wheel-hub-dat]] - [[bearing-dat]]
4
+- [[wheel-dat]] - [[wheel-hub-dat]] - [[bearing-dat]] - [[gear-dat]]
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6 6
![](2026-02-28-19-59-13.png)
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8 8
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+- 14 x 2.125
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+- 16 x 2.125
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+
12
+
13
+- 12~20 inch
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+
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+## 14-inch wheels == kids bike
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+
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+![](2026-02-28-23-53-13.png)
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+
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+![](2026-02-28-23-54-06.png)
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+
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+front wheel
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+
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+![](2026-02-28-23-55-19.png)
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+
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+![](2026-02-28-23-56-37.png)
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+
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+rear wheel
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+
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+![](2026-02-28-23-55-03.png)
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+
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+![](2026-02-28-23-56-00.png)
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+
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+## other sizes
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+
35
+- 24-inch == wheelchair
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+
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+![](2026-03-01-00-11-42.png)
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+
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+
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+## static wheel hub
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+
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+in almost all modern bicycles, the axle itself does not rotate.
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+
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+### Bicycle Rear Wheel Rotation: What Moves?
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+
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+| Component | Status | Movement Description |
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+| :-------------------- | :------------- | :----------------------------------------------------------------- |
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+| **Axle (The Axis)** | **Stationary** | Bolted or clamped to the bike frame; it never spins. |
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+| **Sprockets (Gears)** | **Rotating** | Spin when you pedal; they stay still when you "coast." |
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+| **Hub Shell & Wheel** | **Rotating** | Always spin while the bike is in motion. |
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+| **Bearings** | **Active** | The bridge that allows the wheel to spin *around* the static axle. |
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+
53
+---
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+
55
+### How it works:
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+1. Your **frame** holds the **axle** perfectly still.
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+2. The **bearings** sit on that axle.
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+3. The **hub** (the middle of the wheel) sits on the bearings.
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+4. When you pedal, the **sprockets** push the hub, and the whole wheel spins around that fixed center axis.
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+
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+
9 62
## ref
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+- [[wheel]] - [[wheel-hub]]
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\ No newline at end of file
mechanics-dat/mechanical-structure-dat/Shaft-dat/tube-dat/tube-dat.md
... ...
@@ -2,6 +2,9 @@
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# tube-dat
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5
+- [[tube-dat]] - [[rod-dat]]
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+
7
+
5 8
- [[tube-copper-dat]]
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7 10
- [[tube-pvc-dat]]
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@@ -157,6 +160,14 @@ The "S" shape naturally wants to twist (torsion) and straighten out under load.
157 160
| **6mm Stainless Tube** | **3x Higher** | Moderate |
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159 162
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+## app
164
+
165
+- [[crane-dat]]
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+
167
+## accessories
168
+
169
+- [[hook-crane-dat]]
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+
160 171
## ref
161 172
162 173
- [[tube]] - [[BOM]]
mechanics-dat/mechanical-structure-dat/chain-dat/chain-dat.md
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@@ -8,6 +8,15 @@
8 8
![](2026-01-08-13-45-31.png)
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+## chain types ?
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+
13
+| Chain Type | Pitch (P) | Internal Width (W) | Avg. Tensile Strength | Best Use Case |
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+| :------------- | :-------- | :----------------- | :-------------------- | :--------------------------------- |
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+| **#25 (1/4")** | 6.35 mm | 3.18 mm | ~4,000 N | Small, high-speed, lightweight. |
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+| **T8F (8mm)** | 8.00 mm | 4.80 mm | ~6,000 N | Heavy-duty scooters (High Torque). |
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+| **#35 (3/8")** | 9.53 mm | 4.77 mm | ~9,500 N | Go-karts / Heavy loads. |
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+
19
+
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## main specs
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13 22
- 06B
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@@ -18,29 +27,29 @@
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### 1. Chain — Main Parameters
20 29
21
-| Parameter | Description | Unit / Example |
22
-| --- | --- | --- |
23
-| Pitch (p) | Distance between adjacent roller centers | mm (e.g., 12.7, 15.875) |
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-| Roller Diameter (d₁) | Roller outer diameter | mm |
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-| Inner Width (b₁) | Inner width between chain plates (sprocket tooth fit) | mm |
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-| Chain Length | Total number of links × pitch | mm |
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-| Plate Thickness | Determines load capacity | mm |
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-| Tensile Strength / Rated Load | Maximum allowable tension the chain can carry | N or kN |
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-| Type / Series | Standard or series (ANSI, ISO, DIN, light/medium/heavy) | e.g., ANSI 40, DIN 08B-1 |
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+| Parameter | Description | Unit / Example |
31
+| ----------------------------- | ------------------------------------------------------- | ------------------------ |
32
+| Pitch (p) | Distance between adjacent roller centers | mm (e.g., 12.7, 15.875) |
33
+| Roller Diameter (d₁) | Roller outer diameter | mm |
34
+| Inner Width (b₁) | Inner width between chain plates (sprocket tooth fit) | mm |
35
+| Chain Length | Total number of links × pitch | mm |
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+| Plate Thickness | Determines load capacity | mm |
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+| Tensile Strength / Rated Load | Maximum allowable tension the chain can carry | N or kN |
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+| Type / Series | Standard or series (ANSI, ISO, DIN, light/medium/heavy) | e.g., ANSI 40, DIN 08B-1 |
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31 40
> ⚠️ Pitch is the most critical parameter. The chain and sprocket must have the same pitch to mesh correctly.
32 41
33 42
### 2. Sprocket — Main Parameters
34 43
35
-| Parameter | Description | Unit / Example |
36
-| --- | --- | --- |
37
-| Number of Teeth (z) | Sprocket tooth count; determines gear ratio | 10–120 teeth |
38
-| Pitch (p) | Must match the chain pitch | mm |
39
-| Tooth Profile Standard | Defines the tooth shape for proper engagement | ANSI, ISO, DIN |
40
-| Outside Diameter (OD) | Useful for layout and clearance calculations | mm |
41
-| Mounting Bore / Pin Hole Diameter | Sprocket mounting for shaft or bolts | mm |
42
-| Thickness / Tooth Width | Must be compatible with chain inner width | mm |
43
-| Material / Strength | Determines wear resistance and load capacity | Steel, cast iron, aluminum alloy |
44
+| Parameter | Description | Unit / Example |
45
+| --------------------------------- | --------------------------------------------- | -------------------------------- |
46
+| Number of Teeth (z) | Sprocket tooth count; determines gear ratio | 10–120 teeth |
47
+| Pitch (p) | Must match the chain pitch | mm |
48
+| Tooth Profile Standard | Defines the tooth shape for proper engagement | ANSI, ISO, DIN |
49
+| Outside Diameter (OD) | Useful for layout and clearance calculations | mm |
50
+| Mounting Bore / Pin Hole Diameter | Sprocket mounting for shaft or bolts | mm |
51
+| Thickness / Tooth Width | Must be compatible with chain inner width | mm |
52
+| Material / Strength | Determines wear resistance and load capacity | Steel, cast iron, aluminum alloy |
44 53
45 54
> ⚠️ Tooth count and sprocket diameter set the drive ratio but do not affect mesh compatibility as long as the pitch is the same.
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mechanics-dat/mechanical-structure-dat/frame-profile-dat/alu-extrusion-dat/alu-extrusion-dat.md
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@@ -10,7 +10,11 @@
10 10
- [[ALU-extrusion-1515-sys-dat]]
11 11
12 12
13
-### aluminum profile
13
+## ALU profile accessories
14
+
15
+- [[bearing-pillow-dat]] - [[bearing-dat]]
16
+
17
+## aluminum profile
14 18
15 19
3030 Profile: This refers to an aluminum profile that is 30mm x 30mm in cross-section.
16 20
- It is often used for smaller frames, workstations, and lighter structural applications.