hard learned lesson: premo drill bits are worth the price. Better steel, better grinding, etc. For regular bits -> https://www.amazon.com/DEWALT-DW1361-Titanium-Pilot-21-Piece/dp/B004GIO0F8 … https://twitter.com/jkrwld/status/831211003228590080 …
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10/ Not surprising. Drill bit are actually fairly complicated tech: precise nose angle, precise relief angle,https://twitter.com/Octapode/status/831212368646529024 …
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11/ flutes are a certain helical angle, body center ground, thickness of web changing over length... so easy to make a trashy drill bit.
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