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3d spiral issues
Barry_van_Wijk
Member Posts: 44 PRO
Hi,
I have 2 questions, which are maybe related.
I'm using a 3d spiral FS
https://cad.onshape.com/documents/f437577a13ebbc350129b4a0/w/1873523e917e24872187e57a/e/3818058990e621d97e65afc3
to create a bending twisted loft.
Situation 1:
The 3d spiral is following the spline.
But the spiral points do not end up at the profile sketch, which give problems with piercing the profile sketch.
The spline needs to be 100% vertical. But how do i do that?
A solution is to use a sketch line and connect a spline. But the FS does only work with a spline.
Situation 2:
I have the problem that my helix doesn't start and end on the same axis points:
I don't know how to fix this?
I have made my situation public:
https://cad.onshape.com/documents/4e225d938e08997721242a8b/w/b84dd15a33cf99a5324034e0/e/b3d1711686f659df427c4e2b
Note1: The profile sketch is in this example not the end profile sketch.
Note2: Anyone with a better topic title?
Thank you!
I have 2 questions, which are maybe related.
I'm using a 3d spiral FS
https://cad.onshape.com/documents/f437577a13ebbc350129b4a0/w/1873523e917e24872187e57a/e/3818058990e621d97e65afc3
to create a bending twisted loft.
Situation 1:
The 3d spiral is following the spline.
But the spiral points do not end up at the profile sketch, which give problems with piercing the profile sketch.
The spline needs to be 100% vertical. But how do i do that?
A solution is to use a sketch line and connect a spline. But the FS does only work with a spline.
Situation 2:
I have the problem that my helix doesn't start and end on the same axis points:
I don't know how to fix this?
I have made my situation public:
https://cad.onshape.com/documents/4e225d938e08997721242a8b/w/b84dd15a33cf99a5324034e0/e/b3d1711686f659df427c4e2b
Note1: The profile sketch is in this example not the end profile sketch.
Note2: Anyone with a better topic title?
Thank you!
0
Answers
@konstantin_shiriazdanov
The two spirals around the inverted J caught my attention. I thought — how hard would it be to loft. Turns out that all you have to do is, select the Surface button in the loft dialog box, and then, select the two spirals
Thanks to Kostantin for his updated tool
@steve_shubin
Thank you for your support!
I have updated the 3d spiral and sketched the related profile .
But it stil doesn't work
I think I tikked all the boxes to make it work, but no....
Maybe you guys can find the problem?
New link:
https://cad.onshape.com/documents/67807a66f42ae204984ee5c6/w/78b69b8e83dc4982e1803d33/e/095337ee6fb7756a19d7dcfe
You may also have much better luck with sweeps instead of lofts. I might try 6 spirals, each at the center of their respective cable.
In theory your loft should be able to work. In practice, many CAD systems don't handle even the complexity of sweeping one circle along the spiral path well. They often over simplify and rebuild the path curve in a distorted way and therefore you'll end up with self-intersecting geometry which Parasolid doesn't like.