Gears and transmission
Shawarma Spit Machine with Gear-Rack Knife Drive
- Bounding box
- 150.0 × 150.0 × 190.0 mm
- Engine
- Precision B-rep
- Parameters
- 30
- Published
- October 6, 2026
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The prompt
Base and Frame: A stable base platform (150mm x 150mm x 20mm) with two vertical side support towers (height 160mm) holding a top beam. Rotating Shawarma Spit: A central vertical rotating spit (diameter 8mm, height 120mm) mounted vertically on the base, driven by a spur gear train at the bottom for smooth rotation. Vertical Sliding Knife: A vertical slicing blade mechanism mounted alongside the spit, guided by vertical linear rails, driven to move up and down using a rack and pinion gear system. Gear Interlock Mechanism: An interconnected gear assembly combining spur gears and a rack-and-pinion to drive both the spit rotation and blade vertical motion simultaneously via a single rotary handle/knob. Design Requirements: Engineered with 0.3mm clearances between moving parts for 3D printing assembly (PLA material), smooth mechanical aesthetics, and clean parametric feature geometry.
Parameters
| Name | Value | Range |
|---|---|---|
| Base Length | 150 mm | 80 – 300 |
| Base Width | 150 mm | 80 – 300 |
| Base Height | 20 mm | 6 – 40 |
| Tower Cross Section | 20 mm | 8 – 40 |
| Tower Height | 160 mm | 60 – 300 |
| Top Beam Height | 20 mm | 8 – 40 |
| Spit Diameter | 8 mm | 4 – 20 |
| Spit Length | 120 mm | 40 – 300 |
| Gear Module | 1 mm | 0.5 – 3 |
| Drive Gear Teeth | 30 teeth | 12 – 60 |
| Idler Gear Teeth | 24 teeth | 10 – 50 |
| Spit Gear Teeth | 20 teeth | 10 – 50 |
| Rack Pinion Teeth | 18 teeth | 10 – 40 |
| Gear Face Width | 6 mm | 2 – 20 |
| Idler / Pinion Bore | 6 mm | 2 – 20 |
| Handle Shaft Diameter | 6 mm | 3 – 12 |
| Knob Diameter | 20 mm | 8 – 50 |
| Knob Thickness | 8 mm | 3 – 30 |
| Rack Length | 100 mm | 40 – 250 |
| Rack Width | 8 mm | 4 – 20 |
| Rack Thickness | 8 mm | 4 – 20 |
| Carriage Length | 30 mm | 15 – 80 |
| Carriage Depth | 20 mm | 10 – 60 |
| Carriage Height | 15 mm | 8 – 40 |
| Blade Height | 100 mm | 30 – 250 |
| Blade Width | 30 mm | 10 – 80 |
| Blade Thickness | 1 mm | 0.4 – 5 |
| Rail Length | 120 mm | 40 – 300 |
| Rail Profile Size | 10 mm | 4 – 25 |
| Running Clearance | 0.3 mm | 0 – 1 |
Every value above is a live dimension. Open a model like this in the editor and each one becomes a slider you can drag before exporting.
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