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Splined 3/8 Drive Adapter
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Turn the starter shaft of an engine during maintenance. Fits on 3/8 ratchet, packs away easily in borescope case.
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- Creative Commons — Attribution — Noncommercial — Share Alike
Comes in two sizes, smaller and larger to fit what I need it to (your mileage may very) Splines are curved (don't ask me how I did it, I just did it, it was hard. They're involute-ish maybe(?), I did a lot of measuring, guestimating, draft prints, and trial and error) Prints without supports
Testing to failure I found that: PETG
- 3x wall loops failed between 125-150 lb/in
- 5x wall loops failed between 150-200 lb/in
- Both exhibited same failure mode, the square-drive slot turned round
- Either torque was high enough that it would indicate much bigger problems than a broken tool if encountered during borescope inspection
- I did not perform test with 100% infill or higher wall loop count