# Ersatz-Zahnrad

<span style="white-space: pre-wrap;">Ein weiteres Projekt für unsere Susanne ist ein Ersatz Zahnrad für einen </span>[Dönergrill-Drehspieß](https://www.otto.de/p/rachs-kochwerk-doenergrill-drehspiess-grill-spiess-elektisch-haehnchen-1400-w-inkl-schaschlikspiesse-360-bis-zu-2-kg-fleisch-S0B9O0QC/#variationId=S0B9O0QC1ELC)

[![Unbenannt.jpg](https://unikat-ilmenau.de/wiki/uploads/images/gallery/2025-04/scaled-1680-/unbenannt.jpg)](https://unikat-ilmenau.de/wiki/uploads/images/gallery/2025-04/unbenannt.jpg)

The most difficult part was getting the gear right. I measured the inner and outer diameter of the gear (Kopfkreis Ø 25 mm and Fußkreis Ø 14 mm) and then asked DeepSeek for the modulus of the gear. The first time I didn't give it the amount of teeth and it gave me a long but useless answer. The second time it told me that the module is 2,5. Which turns out to be perfectly right. I used the Gear-Module in FreeCAD to model this gear:

[![grafik.png](https://unikat-ilmenau.de/wiki/uploads/images/gallery/2025-04/scaled-1680-/grafik.png)](https://unikat-ilmenau.de/wiki/uploads/images/gallery/2025-04/grafik.png)

I asked DeepSeek again just for completing this documentation, but it completely messed up:

> My cog has an outer diameter of 25mm and an inner diameter of 14mm. The gear has eight teeth. What is the module?

[![grafik.png](https://unikat-ilmenau.de/wiki/uploads/images/gallery/2025-04/scaled-1680-/yY6grafik.png)](https://unikat-ilmenau.de/wiki/uploads/images/gallery/2025-04/yY6grafik.png)

<p class="callout info">[zahnrad\_01.FCStd](https://unikat-ilmenau.de/wiki/attachments/83)</p>