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David Wheeler
@daveofthings.bsky.social

The bit had slipped by 6mm during the last pass. Possibly it had slipped more before that. When it broke there was less than 8mm of the bit held by the collet. Yikes!

David Wheeler
@daveofthings.bsky.social

My mistake was thinking I could mill a slot 7/8 in deep in oak, even using 1/8 stepdowns. When the chips couldn't escape, they grabbed the up-cut spiral bit and pulled it down. I should have used an extra roughing pass to create space around the bit.

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