Angled d-bit / machinist reamer?

[Fulmen]

On Fulmen Said:

So, like this then?

This is a 20° included chamfer and a 20° oblique. And I think it’s a sensible idea, it should move the cutting action closer to the center line.

Yes, that’s it.  I also ronuded off the left hand end as shown but not actually necessary.

Martin

[FulmenParticipant @fulmen]

No, for a one-off job with a well sized hole it’s not absolutely required. But it’s a small tweak that should make the tool a bit more versatile.

[Author]

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