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How to make the transition from a chamfered edge to an unchamfered edge?
fred_wild
Member Posts: 29 ✭
I'm modeling a porch column in Onshape. The top and bottom parts are square in cross-section, extruded from separate planes. The middle part is an octagon in cross-section (basically a deeply-chamfered square), extruded from a separate plane. Between the parts are short transitions where the octagon becomes square, where the chamfer tapers to nothing. My attempts to loft the transition failed. Is there a way to diminish a chamfer along an edge or otherwise transition from an octagon to a square? Thank you.
Fred Wild
Best Answers
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nick_papageorge_dayjob
Member, csevp Posts: 1,019 PRO
Is this what you want?
There may be a simpler way of making it, but I used individual curves and surfaces to form the transition. Loft does not work very well unless there are a matched number of edges on both ends of the loft. (unless there is a modifying trick to loft I'm not familiar with).
Link:
https://cad.onshape.com/documents/f069d26ee3fe7cd998f1921d/v/d82e9542b29413ae62668554/e/f14f2e8d8029b489319810c4
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GregBrown
Member, Onshape Employees, csevp, pcbaevp Posts: 354 
In this document (https://cad.onshape.com/documents/a059937493dfe00304609db6/w/571737312ebae8a479dcd4b7/e/4c217bed875f3399cb6f08cd) I have a slightly different way that is less picky - had only 8 lofts
I use a solid loft but with the "remove" option. The loft is between a triangular face to a vertex.Update: as always I try to find ways minimize the feature count, and here is an option that uses just 3 lofts and a pattern :)
(https://cad.onshape.com/documents/a059937493dfe00304609db6/w/571737312ebae8a479dcd4b7/e/4518bf2f561d8e8dd45f7211)Finally: I made this parametric column creator - the number of base sides is configured.
2
Answers
Is this what you want?
There may be a simpler way of making it, but I used individual curves and surfaces to form the transition. Loft does not work very well unless there are a matched number of edges on both ends of the loft. (unless there is a modifying trick to loft I'm not familiar with).
Link:
https://cad.onshape.com/documents/f069d26ee3fe7cd998f1921d/v/d82e9542b29413ae62668554/e/f14f2e8d8029b489319810c4
I believe I have it. The answer applies a surface loft from an edge on the octagon section to the corresponding vertex on the square section to create each separate face of the transition. An enhancement for each loft adopts the side line of the adjacent face as a guide. It needed sixteen lofts, but they served the purpose. Thank YouTube and thank you.
Thank you very much.
In this document (https://cad.onshape.com/documents/a059937493dfe00304609db6/w/571737312ebae8a479dcd4b7/e/4c217bed875f3399cb6f08cd) I have a slightly different way that is less picky - had only 8 lofts
I use a solid loft but with the "remove" option. The loft is between a triangular face to a vertex.
Update: as always I try to find ways minimize the feature count, and here is an option that uses just 3 lofts and a pattern :)
(https://cad.onshape.com/documents/a059937493dfe00304609db6/w/571737312ebae8a479dcd4b7/e/4518bf2f561d8e8dd45f7211)
Finally: I made this parametric column creator - the number of base sides is configured.
https://cad.onshape.com/documents/a059937493dfe00304609db6/w/571737312ebae8a479dcd4b7/e/cb8ac2449412e4f5115b986a
I understand. Excellent solution. Thank you.
This column creator is just what I need in another part of the column to make an interrupted chamfer. I'll look at it closely. Thank you.