Octagon Hammerhead Bevel

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Octagon Hammerhead Bevel

Postby Jersey22651 » Fri Dec 20, 2019 12:05 am

I designed a small sledge hammer to be made of brass and used for display.

I actually made one about almost 50 years ago and decided to craft one for my grandson.

The 45-degree bevel on each end of the original hammer was machined on a lathe.

In Sketchup I beveled the octagon on the ends of the hammer using Fredo6 Round Corner and, as seen in the drawing below, the face of the hammer is also octagonal.

I tried to make the face at the end of the bevel round while keeping the octagon at the top of the bevel without success.

Does anyone have any idea if this can be done?

Any help will be appreciated.
Hammerhead.jpg

Thanks

Don
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Re: Octagon Hammerhead Bevel

Postby L i am » Fri Dec 20, 2019 1:43 am

Hammer2.png
Hi, I would not have used the round corner tool I would have used "follow me" tool
If you rounded off the octagonal edge a bit it would also work and be a little more real

Cheers
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Re: Octagon Hammerhead Bevel

Postby Box » Fri Dec 20, 2019 2:19 am

Something like this.
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Re: Octagon Hammerhead Bevel

Postby Jersey22651 » Fri Dec 20, 2019 4:04 am

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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Re: Octagon Hammerhead Bevel

Postby TBoy » Fri Dec 20, 2019 4:45 am

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.
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Re: Octagon Hammerhead Bevel

Postby Dave R » Fri Dec 20, 2019 5:16 am

Maybe something close to this? Nothing but native tools.
Screenshot - 12_19_2019 , 10_15_45 PM.png
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Re: Octagon Hammerhead Bevel

Postby TBoy » Fri Dec 20, 2019 5:39 am

51puLpZT8mL._SX342_.jpg

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.
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Last edited by TBoy on Fri Dec 20, 2019 5:59 am, edited 3 times in total.

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Re: Octagon Hammerhead Bevel

Postby Dave R » Fri Dec 20, 2019 5:45 am

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

Postby Jersey22651 » Fri Dec 20, 2019 6:26 am

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?
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Re: Octagon Hammerhead Bevel

Postby Box » Fri Dec 20, 2019 7:12 am

One option is to use solid tools to use a cutter that you subtract from the octagon.
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Re: Octagon Hammerhead Bevel

Postby Dave R » Fri Dec 20, 2019 1:25 pm

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.
hammer.gif


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.
Screenshot - 12_20_2019 , 2_37_06 PM.png
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Re: Octagon Hammerhead Bevel

Postby pilou » Fri Dec 20, 2019 3:55 pm

...or take a look to the Geodesic Taffgosh collection! ;)
Or the McMaster-Carr collection...
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Re: Octagon Hammerhead Bevel

Postby Mike Amos » Sat Dec 21, 2019 11:48 am

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