Why when I loft 2 surfaces its smooth, but when I add a guide it adds unwanted lines?

arthur_nichelson

I'm trying to loft 2 surfaces together and use lines in different sketches as a guide. When I first create the loft, there is a smooth transition between the 2 surfaces. When I add the first guide it is still smooth, but when I add the second guide, the loft is messed up and isn't smooth. Why is this happening?

Loft with no guides


Loft with 1st guide


Loft with second guide that messes it up (arrow points to line I don't want)

mahir

@arthur_nichelson FTFY
Your guide in Sketch23 was not coincident to your profile corner in Sketch1. And your profile corner in Sketch24 wasn't coincident to the guide in Sketch23. This was causing the extra line, which when you zoom in is actually an extra surface. 



https://cad.onshape.com/documents/aeb0c5434a489bcc0dd54829/w/99788787cc20927096de717e/e/0a21c25326b112d3319330f4

mahir

Link to your public document? Looks like there is some unintended twist going on. I think you can fix this via vertex matching. Also, make sure your profiles have the same number of segments. This allows you to control which points end up connecting to each other.

arthur_nichelson

@mahir Both sketches have the same number of segments and vertices.

Here is a link to the public document: https://cad.onshape.com/documents/ea2cb959c00e2472051502e6/w/73d21f2a63aea0764e34dead/e/9aeb450b26ab3a3771997cf0

mahir

@arthur_nichelson I get the error below trying to open your link. Make sure your document is Public with permission to Copy permissions.

arthur_nichelson

@mahir I think I fixed it, hopefully it'll work now,

mahir

@arthur_nichelson FTFY
Your guide in Sketch23 was not coincident to your profile corner in Sketch1. And your profile corner in Sketch24 wasn't coincident to the guide in Sketch23. This was causing the extra line, which when you zoom in is actually an extra surface. 



https://cad.onshape.com/documents/aeb0c5434a489bcc0dd54829/w/99788787cc20927096de717e/e/0a21c25326b112d3319330f4

arthur_nichelson

@mahir Thank you for your help, I was able to fix it.