How to drill square holes and several other interesting mechanical principles.
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How to drill square holes
Apr 12, 2012
5 Replies
The Rouleau(sp?) triangle drill CANNOT drill a square hole ...exactly, because it cannot reach completely into the corners.
Check out "rotary broaching"
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- Mark the square
- Mark the center
- Drill a round hole
- Take a triangle file to open up the corners
This works well, and I use it in metal whenever I want to use a carriage bolt. This would obviously be too slow for production, though.
Jon
Use a mortising bit/
Rotary broaching is a great way to make small square holes in precision machined products. Take a look at this video which shows internal and external forms: (the video shows hexagons but square holes are made the same way)
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Also, see
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for more information about the tools.
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