Use a Reuleaux triangle drill bit to create square holes (…well, almost-square holes).
…sort of like a Wankel engine for woodworking.
Reuleaux Triangle – Mathworld … via Hacker News
Related posts:
How to Drill Square Holes
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{ 2 comments… read them below or add one }
This is cool, I use this technique in my woodworking shop all the time!
This is cool. I never would’ve figured this out on my own, either.