Sony Walkman WM-EX808 Gear K
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Replacement gear for a Sony Walkman
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- Audio
- Licencja
- Creative Commons — Attribution
This is a gear made for the Sony Walkman WM-EX808, specifically Gear (K) with part number 3-365-755-01
According to this part number it should also fit on the EX66, EX77, EX88, EX60, EX70, EX707, FX70, FX77, FX707, and FX777.
Since this is a very small part it's recommended to print it on a CNC or SLA/SLS printer. I tried it on my FDM but even at 0.08mm it was not small enough to be able to print the teeth
To create these, I took measurements of one I had and then compared it to standards that are used. My measurements were:
Large gear section:
66 teeth
20.20mm +/- diameter including teeth
Teeth around 0.63-0.7mm high
Thickness at the teeth is 0.58mm, this thickness stretches for 2mm after which it gets 0.8mm thick.
At the center there is another disc that secures the 1.28mm pin, this one is 0.10mm high and has a diameter of 2.26mm
On the other side there is a smaller gear:
14 teeth
4.6mm diameter including teeth
1mm thick
Also has an extra "disc" to secure the 1.28mm pin, this one is higher at around 0.45mm high and has a diameter of 2.26mm. Due to my original wheel being defective it kept going in between 0.35 and 0.45mm. I got 0.45 on the most sections so I took that value.
I've fine-tuned the 3D file a bit on 06 august 2028 because I noticed it was not yet a perfect fit. The main things I've adjusted are the disc on bottom and top from 0.15mm and 0.15mm to 0.1mm and 0.45mm. In addition, I've increased the pin hole to 1.3mm to ensure a smoother fit with less friction.