Spring Loaded Drag Bit Holder for PCB Soldermask Removal
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Spring loaded bit for removing soldermask material
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There are multiple designs similar to this one, including a Youtube video (here) and the one Makera sells, as well as the design on the Wegstr machines. The key difference with mine are that it uses readily available springs on amazon. I think the spring type is important - some designs use springs from a ballpoint pen, but I think those springs are too strong. The wire for most pen springs is 0.3 mm. I recommend 0.2mm, up to 40mm spring. Tension can be set with the set screw in the end.
An M5 set screw is required for tensioning the spring, and an M3 is required for preventing the bit from slipping out.
Holes are intentionally undersized on the ends, so you can drill them out to a smooth mating surface, avoiding binding on the FDM layers.