topic Re: How do I cut out an offset prism? in Fusion Design, Validate & Document Forum

How do I cut out an offset prism?

jwatte — Fri, 24 May 2019 16:22:27 GMT

I have a part, cut out of a rectangular block, where the bottom of the cut-out is not a horizontal plane (the bottom has slight drafts.)

Now, I want to make the "actual bottom" be 1.5mm thick along the Z axis (which is not 90 degrees to the draft -- more like 75 degrees.)

In a tool like 3ds Max, I would select the faces, then offset then along the Z axis to create a new prismatic feature, and then use CSG to cut out from underneath these surfaces. However, I can't figure out how to do this with the primitives available in Fusion, mainly because there doesn't seem to be a way to first construct a derived body, and then use that body to cut out from the original body.

How would I best accomplish what I want here? (In this screen shot, the floor of the carve-out is visible; I have also projected the faces of that floor to the bottom of the rectangular stock part, for illustration. I want the floor to be 1.5mm thick in the Z direction.)

Re: How do I cut out an offset prism?

HughesTooling — Fri, 24 May 2019 17:39:58 GMT

Try going to the patch workspace and use Offset face set to zero offset to make copies on the faces. Move the faces down the required distance. Still in the patch workspace build sides and a base, stick the faces to make a solid then switch back to the solid workspace and use combine set to Cut.

You can create a copy of a body using Boundary Fill by the way.

Mark

Re: How do I cut out an offset prism?

HughesTooling — Fri, 24 May 2019 17:42:37 GMT

Question, why can you just offset the faces, moving them down 1.5mm will create a variable wall thickness depending on the angle\curve of each face.

Mark

Re: How do I cut out an offset prism?

jwatte — Fri, 24 May 2019 18:50:34 GMT

I understand that the "true thickness" of the bottom will vary based on angle.

The "1.5 mm projected down" works better for my machining solution, and because all the faces are < 15 degree canted, the actual difference is small.

Separately: Thanks for the suggestion to check out "patch space" and also "combine" -- hopefully I can make something work along those lines!

Re: How do I cut out an offset prism?

chrisplyler — Sat, 25 May 2019 03:59:24 GMT

Another thing to consider:

Learn how to model this parametrically instead of using F360's crappy Primitive bodies.

Re: How do I cut out an offset prism?

Anonymous — Sat, 25 May 2019 04:39:16 GMT

The main thing I was missing was Modify -> Combine -> Cut.