Jerry
99 lines
2.8 KiB
Markdown
99 lines
2.8 KiB
Markdown
# 7 — Right-angle bevel gear drive
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> **Prompt**
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>
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> Build a right-angle bevel gear drive: a 24-tooth bevel gear on a vertical shaft meshing at 90 degrees with a 16-tooth bevel pinion on a horizontal shaft, each on a short stub shaft.
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Fully parametric OpenSCAD built from the prompt above — adjustable dimensions and colours, exported as `.SCAD` and rendered to the orbiting preview with [`render.sh`](render.sh).
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<p align="center"><img src="07-bevel-gear-drive.gif" alt="Right-angle bevel gear drive — orbiting render" width="380"></p>
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**Parametric controls:** 9 dimensions · 3 colours
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**What it demonstrates**
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- A meshing **bevel gear pair** at 90° via BOSL2 `bevel_gear()` with matched pitch cones
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- 24-tooth gear + 16-tooth pinion, each on a stub shaft
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- Three colours for gear / pinion / shafts
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**Editable parameters**
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| Parameter | Default | Range / options | Description |
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| --- | --- | --- | --- |
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| `gear1_teeth` | `24` | `[10:1:60]` | |
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| `gear2_teeth` | `16` | `[10:1:60]` | |
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| `circular_pitch` | `5` | `[2:0.5:10]` | |
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| `face_width` | `8` | `[4:1:20]` | |
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| `bore_diameter` | `5` | `[2:0.5:20]` | |
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| `shaft_length` | `30` | `[10:1:50]` | |
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| `shaft_diameter` | `5` | `[2:0.5:20]` | |
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| `gear2_spin` | `11.25` | `[0:0.1:45]` | |
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<details>
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<summary>OpenSCAD source — <code>07-bevel-gear-drive.scad</code></summary>
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```scad
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include <BOSL2/std.scad>
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include <BOSL2/gears.scad>
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/* [Gear Specifications] */
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gear1_teeth = 24; // [10:1:60]
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gear2_teeth = 16; // [10:1:60]
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circular_pitch = 5; // [2:0.5:10]
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face_width = 8; // [4:1:20]
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bore_diameter = 5; // [2:0.5:20]
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shaft_length = 30; // [10:1:50]
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shaft_diameter = 5; // [2:0.5:20]
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gear2_spin = 11.25; // [0:0.1:45]
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/* [Colors] */
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gear1_color = "SteelBlue";
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gear2_color = "DarkOrange";
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shaft_color = "Silver";
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$fn = 64;
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module gear_system() {
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// Gear 1: Vertical (Z-axis)
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color(gear1_color)
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bevel_gear(
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circ_pitch = circular_pitch,
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teeth = gear1_teeth,
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mate_teeth = gear2_teeth,
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face_width = face_width,
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bore = bore_diameter,
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spiral = 0,
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anchor = "apex"
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);
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// Vertical Shaft
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color(shaft_color)
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translate([0, 0, -shaft_length/2])
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cylinder(h=shaft_length, d=shaft_diameter, center=true);
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// Gear 2: Horizontal (X-axis)
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color(gear2_color)
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rotate([0, 90, 0])
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rotate([0, 0, gear2_spin]) // Fine-tune tooth meshing
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bevel_gear(
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circ_pitch = circular_pitch,
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teeth = gear2_teeth,
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mate_teeth = gear1_teeth,
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face_width = face_width,
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bore = bore_diameter,
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spiral = 0,
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anchor = "apex"
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);
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// Horizontal Shaft
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color(shaft_color)
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rotate([0, 90, 0])
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translate([0, 0, -shaft_length/2])
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cylinder(h=shaft_length, d=shaft_diameter, center=true);
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}
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gear_system();
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```
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</details>
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