How to create closed helix circular path?

Hello. We have a user who wants to know:

<div id="post_message_216">How to construct a closed helix following a
circle?

Thanks.
</div>

sth like this?????



Edited by: dolphin

<DIV>dolphin,</DIV>
<DIV></DIV>
<DIV>I too am curious about construction of a helix and I say the one posted on the MCADCENTRAL site but I did not see any instructions. Actually, all i need to do is to learn how to create a helix that follows an arc or curve. In my project, I have created something similar to an open tube that is approximately 4 inches long and curved. It would resemble your closed helix except it would only be approximately 1/3 of the length.</DIV>
<DIV></DIV>
<DIV>Larry Coyle</DIV>

Hi Dolphin,

Can you post for us a procedure that we can use to create this helix?

It would be greatly appreciated.
Thanks.
DefCon5

Hi all,


Use followingset ofequations (or click the links at the botom of the post)to create the curve (the so called Toroidal Spiral)


t=0
a=25
b=50
c=30
xt=(a*sin(360*c*t)+b)*cos(360*t)
yt=(a*sin(360*c*t)+b)*sin(360*t)
zt=a*cos(360*c*t)



Followthese steps UG NX2)


1)Enter above expessions using Tools->Expessions, 'c' is number of turns.


2)Inset->Cuve->Law Curve...


Choose 'by equation' optionfor xt, yt and zt values


3)Now create a datum plane by using Point on Curve option, select the curve ceated.


4)Select this datum plane to create Sketcher


while u r in sketcher mode, choose Insert->Associative point...


click Intersection point icon on Point Constructor dialog box, and select datum plane and curve respectively. Create a circle (say5 units) and constrain its centerto the above created associative point.


5)Use 'sweep along guide'or 'swept' to create the model.


Thats all folks!!!


U canrefer these links to know more about such equations :


http://www.salsburg.com/downloads/downloads.html
www.cs.csustan.edu/~rsc/SDSU/Math.projects.pdf
http://spirals.eternite.com/