Creating Inverse Chamfer

[john1907]

Is there an easy way to create an inverse chamfer feature (like in the original STL on the left in the attached image) in Fusion 360?

[sanjana.shankar.goli]

@john1907 

Would this be closer to what you're looking for? (File here - https://a360.co/3uCAEgh)

[etfrench]

Model one hexagon with a chamfer (or draft).  Use a joint to position it flush with a hexagon in the current model. Copy it and joint the copies to each of the other hexagons in the model.  Hide (or Remove) the original model.

[TrippyLighting]

Please share the model. Export as .f3d and attach to a post.

[john1907 · Accepted solution]

So what I ended up doing was offsetting a construction plane from each individual hex, projecting the hex onto a sketch on that plane, offsetting the projection to create a smaller hex in the sketch, and then lofting between the original hex and the smaller hex in my sketch. I created some parameters to ensure that I could control all the chamfer dimensions and make sure the overall shell thickness didn't change. 

Probably an easier way to do it but I couldn't figure it out.

[john1907]

This method doesn't quite work for me because I need to create negative volume along an existing edge.

Basically changing from a cross section along each edge that looks like the black lines in the image below, to one that looks like the purple lines.

There is added complexity because the tiles themselves are angled in relation to each other and each joint has three edges coming together. Also not all of the tiles are hexagons, some pentagons are required to tile a sphere.

As I mentioned to another commenter below I was able to solve this with projections and lofts but it was pretty tedious.

[TrippyLighting]

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@john1907 wrote:

... but it was pretty tedious.

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Your entire method of constructing this is tedious 😉

While your object is not a truncated Icosahedron (or at least I don't think it is) I created a tutorial a few years ago on how to create one in Fusion 360.

Maybe you can adapt that workflow too your object:

[john1907]

If you are talking about the workflow to generate the original shape I used an add-on called Polyhedron Generator. I grabbed one of their preconstructed shapes from the weblink and the add-on worked some magic in Fusion 360 to create it. So that part was actually pretty untedious lol. But thanks for the helpful tutorial, it's useful to know how to make one if I ever need some additional customization.