Angled spars through ribs

Answers

• Derek_Van_Allen_BD Member Posts: 449 PRO

  December 15 edited December 15

  I have the core essence of a solution to this in 456D Make but I haven't yet enabled the non-perpendicular ribs cases or independent control of plane spacing. What I'm doing in the script is projecting the non-normal wall faces back to the primary and then thickening them the slice width and removing the geometry to normalize the cuts. Future updates will include skew slicing support.

  So essentially I'm doing a Boolean intersection (actually subtract_complement for ID stability reasons) between the two members, splitting that body in half along the pull direction, and Booleaning each half of the intersection with one of the slices, letting the faces be skew.

  Then apply a normalization script that does the project>thicken>remove process. It handles simple geometry extremely well, more complex geometry so-so.

  Derek Van Allen | Engineering Consultant | Meddler

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• graham_lock Member Posts: 265 PRO

  December 15

  Thanks @Derek_Van_Allen_BD
  

  Taking your description and trying to turn it into a FS script workflow:

  1. For each rib, build a local “slice slab” centered on the rib plane (thickness = rib thickness).
  2. Intersect slab and spar - this gives only the bit of spar that actually passes through that rib.
  3. In a sketch on the rib plane, Use the edges of that intersection body projecting them onto the sketch plane.
  4. Extrude the resulting sketch regions through the rib thickness to make a straight-walled cutter.
  5. Boolean subtract that cutter from the rib.
     

  is that pretty much what you were describing?

  Thank you.

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• Derek_Van_Allen_BD Member Posts: 449 PRO

  December 15

  Philosophically more or less. Minor differences in my implementation. Firstly I'm picking a primary face on my ribs that already exists to project to instead of trying to go middle out. Secondly I'm using a function called opCreateOutline instead of creating a sketch for my projection method. Thirdly I chose to use opThicken instead of an extrude. The core reasoning for this is that sketch geometry constrains you to planar geometry and there's a world where I want to normalize a rolled surface. All of these functions should be applicable to a curved domain instead of pigeonholing my script to only work in flat land.

  Derek Van Allen | Engineering Consultant | Meddler

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• graham_lock Member Posts: 265 PRO

  12:04AM

  ok thank you, I haven’t come across opCreateOutline, I’ll have a play.

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