Problem with Sweep?

[Anonymous]

I have been working in Fusion 360 to create a model of a fleur de lys and I am having trouble while trying to sweep a profile of the left leaf.  Initially the problem was because I had the rail curve and the guide curve intersecting, so the preview after selecting the profile, rail and guide wouldn't generate.  I initially simply set the distance to a smaller value and the preview then worked.  Clicking OK then created a body that matched the preview.  However, when sweeping the same profile in the other direction, I was not able to get the second part to generate, even when selecting a smaller distance would show a preview.  When the OK button was pressed, no body was generated nor was the second part joined to the first when I tried that option, even though the preview showed that it should have worked.  Even a ridiculously small slice of .1 distance from the starting position, which does not contain any sharp curves, would fail, even when the preview worked with no errors.

Once I understood what the error message was reporting after the failure, I went back into the sketch and nicked off the tip of the converging outlines (truncated the corner) and re-adjusted my rail and guide splines.  I deleted and recreated the first part of the sweep, keeping the distance at 1 and the sweep worked perfectly.  However, the second part of the sweep still does not work correctly, even though the preview displays fine even with the distance at 1.  Even as small of a distance as .01 does not work when the OK button is clicked.

Since the preview portion is working before I click OK, I assume that the sweep should have succeeded so I am posting it here as a possible bug. I've attached my model and a screencast showing the problem.

Thanks for any help you can provide,

Jonathan Lee

[ahreum.ryu · Accepted solution]

Hi @Anonymous, 

Thank you for posting! 

As far as I know, Path + guiderail command creates geometry from a closed profile plan along a path even though the rail and path sketches are across the profile plan.

When I treid it at the first time, the sweep shaped was made toward right direction along the path and when tring left side (the small piece), the sweep recognized the right path so the result could see as cut option.

so I would like to suggest to seperate the rail and path. It was succeded so please find the attached file and my screencast. http://autode.sk/2rNDGyI

Hopefully this will help 

Many thanks, 

[Anonymous]

Hello Ahreum Ryu,

When you were showing the short section as a cut in your screencast, you just needed to click the "Flip Direction" icon to get it to go in the right direction for the short section.

However, the alternate method you showed of using a patch seems to work around the bug and allows me to continue working on the model so I have marked it as the solution for my problem.

I would still suggest investigation of why the preview mode shows no error and looks as if it should work but then fails when OK is clicked, as shown in my screencast.  It is definitely a repeatable problem as I deleted and recreated the sweep steps several times.

Thanks,

Jonathan Lee