Loft along a curve - broken curve?
I think the problem is you have several coincident points at the end of the arcs, for some you have the end point of 2 arcs and 2 construction lines. I deleted the shorter construction lines and replaced some with horizontal\vertical constraints and some with coincident constraint to the longer construction lines. Also deleted the tangent constraints between the arcs and lines and replaced them with tangent constraints just between the arcs. I think everything is still correct but you probably better double check. File's attached.
Mark
Mark Hughes
Owner, Hughes Tooling
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The center rail sketch can be designed fully constrained without using any construction lines and then lofts without problems.
The construction lines have basically been replaced by horizontal/vertical constraints.
This way only arc end points are connected and don't coincide with construction line end points which is possibly what confuses Fusion 360 here.
@NYC_CNC wrote:
Thanks! I see how that fixes it. Any tips on how to model this correctly from the start? E.g. my method seems flawed given the results, but unclear how I should be doing this going forward. Thanks.
Only advise is keep it simple. I've tried to help a few people struggling with sketches on the forum and having several collinear connected lines causes problems because it's hard to tell which constraints apply to which line, one edit and the sketch explodes. If you have a construction line you need longer use extend don't draw another line on the end. With arc endpoints it can be a good idea to snap the endpoints together before snapping to the construction lines\points so you know they're joined together not joined to the line end point.
Mark
Mark Hughes
Owner, Hughes Tooling
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@mufadal89 wrote:
Going back to redesigning the sketch is very tedious.
True, but you only have to re-design it when you start on the wrong foot 😉
Likely because there are more than line/arc endpoint joined in one location, which makes it impossible for Fusion 360 to decide which element belongs to the path and which does not.
If you zoom in on the highlighted arc you'll see it's end is not coincident with the end of the other arc, inside red box. Actually this is a good example of the colour status for constrainment not working. At the other end of the highlighted arc there are 4 end points so god knows what's joined to what/
Mark
Mark Hughes
Owner, Hughes Tooling
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@mufadal89 Here's why it fails at the other end, buried under the pile of construction lines there are 2 more lines the need to be change to construction line for it to work.
Mark
Mark Hughes
Owner, Hughes Tooling
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" Actually this is a good example of the colour status for constrainment not working."
Good to know !
Claas Kuhnen
Faculty Industrial Design – Wayne State Universit
Chair Interior Design – Wayne State University
Owner studioKuhnen – product : interface : design
