Recreating the linked ring in OnShape

charlie_kingsland

Just wondering if it is possible to recreate this ring (https://www.thingiverse.com/thing:711970) in OnShape? I know how to get the basic ring shape, just not the low-poly texture/pattern… Any help appreciated!

BenTaylor

Here are my attempts: https://cad.onshape.com/documents/6d25c7d234b2a3791d2fb4e5/w/d272849b5d0725527f2bafc4/e/ac6c7485ceeb4fbe02236fee

The "Convex Poly" part studio has the simplest feature tree with all the planes and points, and then the "Convex Polyhedron" custom feature that @MichaelPascoe mentioned above. This is computationally heavy, though - that one feature takes ~14 seconds to regenerate. 

The linked ring you are looking at is fairly simple to construct geometrically. It has the same 3 faces mirrored, rotated, and patterned all around the ring. I constructed that in the "Manual Surfaces" part studio. I parametrically defined the edges, then lofted between the edges and points to create a surface. Then I just mirrored, transformed, and patterned it so it creates the geometry you want. It's a bit more work to figure out how to build it and what to pattern, but is computationally much better - only ~0.13 seconds for the whole feature tree.

MichaelPascoe

Here is a technique that I like for low poly modeling: How to create a low-poly object
You could also check out the custom feature Convex Polyhedron by @konstantin_shiriazdanov

BenTaylor

Here are my attempts: https://cad.onshape.com/documents/6d25c7d234b2a3791d2fb4e5/w/d272849b5d0725527f2bafc4/e/ac6c7485ceeb4fbe02236fee

The "Convex Poly" part studio has the simplest feature tree with all the planes and points, and then the "Convex Polyhedron" custom feature that @MichaelPascoe mentioned above. This is computationally heavy, though - that one feature takes ~14 seconds to regenerate. 

The linked ring you are looking at is fairly simple to construct geometrically. It has the same 3 faces mirrored, rotated, and patterned all around the ring. I constructed that in the "Manual Surfaces" part studio. I parametrically defined the edges, then lofted between the edges and points to create a surface. Then I just mirrored, transformed, and patterned it so it creates the geometry you want. It's a bit more work to figure out how to build it and what to pattern, but is computationally much better - only ~0.13 seconds for the whole feature tree.

charlie_kingsland

BenTaylor said:

Here are my attempts: https://cad.onshape.com/documents/6d25c7d234b2a3791d2fb4e5/w/d272849b5d0725527f2bafc4/e/ac6c7485ceeb4fbe02236fee

The "Convex Poly" part studio has the simplest feature tree with all the planes and points, and then the "Convex Polyhedron" custom feature that @MichaelPascoe mentioned above. This is computationally heavy, though - that one feature takes ~14 seconds to regenerate. 

The linked ring you are looking at is fairly simple to construct geometrically. It has the same 3 faces mirrored, rotated, and patterned all around the ring. I constructed that in the "Manual Surfaces" part studio. I parametrically defined the edges, then lofted between the edges and points to create a surface. Then I just mirrored, transformed, and patterned it so it creates the geometry you want. It's a bit more work to figure out how to build it and what to pattern, but is computationally much better - only ~0.13 seconds for the whole feature tree.

Thanks for the help! I recreated the "Convex Polyhedron" one, but I have a flat edge... The link to my document is: https://cad.onshape.com/documents/8093cb5ffc8311a5a02c2e4e/w/fcfd845381ea9950a1442853/e/7feb4bff10336a1122a2779e (Part Studio 1). Do you know how I can stop it being flat? 

MichaelPascoe

Try making sketch 3 larger in diameter than the other sketches.

charlie_kingsland

MichaelPascoe said:

Try making sketch 3 larger in diameter than the other sketches.

Thanks, that worked!