Octagon Hammerhead Bevel

[Jersey22651]

Referring back to my hammer pic, my goal is to maintain the sharp edge on the outer or larger octagon, the true 45-degree angle descending into a circle on the face. Reiterating that I want the bevel to look as if it were cut on a lathe.

It is fine if this cannot be exactly done in sketchup.

I just need to know if it is possible and if so, how.

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[TBoy]

Use Fredo6_CurviLoft.
In the above picture circle is inscribed and 45 degree will be at points where circle touch the octagon. 45 degree angle will vary according to distance of corresponding points from octagon to circle.

[Dave R]

Maybe something close to this? Nothing but native tools.

[Dave R]

I modeled basically what TBoy shows with his bolt head image. I modeled it the same way I would model that bolt head, too.

[TBoy]

Here bevel angle is constant but octagon is not with straight lines.
DaveR proposal is to make very small second bevel to convert small octagon to circle.

[Jersey22651]

Thank you all for your help.

Dave R: I have no experience modeling a bolt head as shown in your picture. That is exactly what I want the hammerhead to look like.

Would you mind providing information on how to do this?
Or, refer me to a tutorial somewhere?

[Box]

One option is to use solid tools to use a cutter that you subtract from the octagon.

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[Dave R]

Sorry. I got called away. I did something similar to what Box shows with the addition of a chamfer added to the head first. Offset to define the limits chamfer, Move with Auto-Fold to pull the face out. Then a dome shape intersected and the waste removed.

You can change the result to be like the head of the bolt by omitting the chamfer and you can adjust the location of the dome.

[pilou]

...or take a look to the Geodesic Taffgosh collection!
Or the McMaster-Carr collection...

[Mike Amos]

Interesting links but the McMaster-Carr collection appears not to have a CAD relevance.