Sweeping a path (knot)

[sakkie.coetzee]

I'm trying to draw a knot in a rope, and the profile do not want to follow the path.  It keeps on coming up with an error.

I made the loop so big that there can be no interference.  I hit a wall on this one.

Please help anybody.

I'm attaching the part file,

[leowarren34]

I've looked at, still a self intersection error, I undid the knot and it sweeps fine.

Unless someone beats me to it, I'll provide an example tomorrow.

[JDMather · Accepted solution]

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@leowarren34 wrote:

Unless someone beats me to it, I'll provide an example tomorrow.

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You are 13 yrs too late - See Attached.

[johnsonshiue · Accepted solution]

Hi! This is easily doable. The issue here is that the path has a bad end. If you look closer to the path, you will see there is unreasonable curvature distribution.

Edit 3D Sketch3 -> right-click on the curve -> Display Curvature. The tip at the end curves back. The control vertices there need to be deleted. After that, it is a straight forward sweep. Please see attached part. How did you create the path?

Many thanks!

[sakkie.coetzee]

Hi Johnson,

Thanks for highlighting the problem.

I created the knotted path using the 3D spline.  First drawing it at right angles roughly the way a knot looks, and then "fine tuned" it from all angles to look like a true knotted rope.  It took a while 😁

[sakkie.coetzee]

I wanted to show you guys why I was after this knot.

I was asked to "invent" a mini gym for 5-6 y.o. children, using extruded recycled plastic, and I wanted it to look as realistic as possible.  The unsighted side is a climbing wall.

I'll still make the rope a bit thinner, and put two more knots in there.

Again, thanks for the assistance.

See the attached screen clip