Watch Case Back Polishing Arbor – Internal Expanding Collet / ID Chuck
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Holder for watch case backs or bezels for polishing or sanding.
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Model information
- Source
- Printables
- Category
- Tools
- License
- Creative Commons — Attribution — Noncommercial
Polishing watch case backs by hand against a spinning wheel usually results in rounded edges and uneven finishes. Professional horological holders keep the part centered and rotating, but commercial tools are expensive.
This model is a budget-friendly expanding split-collet mandrel tailored for watchmakers and modders. By mounting the case back from its interior perimeter, the external face and bevels remain completely unobstructed. When chucked into a drill or lathe, rotating the part against your polishing medium guarantees even material removal across the entire 360-degree radius.
Hardware Required
1x M5 Machine Screw:
Standard hex socket cap screw works best
30mm length or more
for smoother operation chamfer the bottom edge of the screwhead with a file while spinning the screw with a drill
1x M5 Hex Nut
mount the hex nut into the nut adaptor
1x Washer to distribute the clamping force
inner diameter 5mm
outer diameter 15mm or more