Machining 101: How to drill a square hole at home without special tools.
Updated better method here: • How to Drill Square Holes! Make your own homemade broaching tool for "drilling" perfectly square holes in steel. In this case we are using it as a tool holder on a milling machine slotting attachment. Long term projects here: / ave

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Make a SQUARE hole with a ROUND forstner drill bit!

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