snake on dome

[Aldo C.]

Good morning.
in 1990 I started drawing with autocad 2d and and casually with inventor, we design tanks and heat exchangers for the oil and chemical industries.
I would like to ask how to develop a spiral serpent that wraps a half ball.
that is how to project on a sphere a spiral from which then to pass a sweep.

thanks to all

aldo

 

[TECNOMODEL]

a solution is to draw the spiral in plant on the central plane of the ball, 3d sketch,project on surface.

probably there is also a better method, let's see if others have suggestions.

 

[rf.infissi@libero.it]

Good morning.
in 1990 I started drawing with autocad 2d and and casually with inventor, we design tanks and heat exchangers for the oil and chemical industries.
I would like to ask how to develop a spiral serpent that wraps a half ball.
that is how to project on a sphere a spiral from which then to pass a sweep.

thanks to all

aldo

I don't know what you're talking about, but to project a spiral you need to create a 3d sketch create the spiral on the plane and a perpendicular axis on the plane (of the spiral), after calling the command project on the surface and side selections (the surface of the sphere)-> curves (the spiral)-> direction (the perpendicular axis on the plane) and you should get the one required.

if I wasn't clear or wrong something correct me...

 

[Aldo C.]

I don't know if the image is seen... .
but that's what I want to get... .

Thank you.

 

[rf.infissi@libero.it]

the process is equal to what I have described but you do not have to make a spiral but a slightly larger helical curve of the sphere and project it on the surface of the sphere, in the project command uses the sec button projected to the nearest point I think it is more appropriate.

I hope I've helped you by... .

 

[Aldo C.]

OK thank you, I try to apply your directions and I will let you know....

 

[laura888]

Hello aldo,
you can create serpentine using a 3d sketch formula.
in this discussion something similar has been done:http://www.cad3d.it/forum1/threads/40753-spirale-su-fondo-bombato/page2Good evening

 

[Aldo C.]

great result, thanks for the search.
I have to get something similar but with regular pitch (150 mm between one curve and the other).
I attach an image of how I solved I first created a sketch in autocad mecchanical of a section with the diameter of the sphere (dia 1832 mm) and the passage of the serpent (150 mm) and then in inventor I built a helid at a time (10 in all) of a single spin of the sphere getting the data from the 2d sketch. (pass, revolution, rake)
but this as logical is not very precise.
aldo