spring with variable pitch

[vitulin]

Hi,

I am using NX 4 and I would like to create a model of spring with variable pitch. How would you proceed with this?
Thanks
Vit

 

[vitulin]

I have created a model, that I thought should work, but it does not. I created expressions :
t
xt
yt

and then I created a sketch for zt coor.
Then I inserted a law curve, but see what happend.

Regards
Vit

 

[JohnRBaker]

Here's a simple program which will create a variable-pitch helix (spline) curve.

John R. Baker, P.E.
Product 'Evangelist'
NX Design
Siemens PLM Software Inc.
Cypress, CA

http://www.siemens.com/plm

http://www.plmworld.org/museum/

To an Engineer, the glass is twice as big as it needs to be.

 

[vitulin]

Thanks JOhn,

I havent used GRIP much ) but I have managed to do what I wanted, you can check the spring model, if you want...you only have to set d1,d2 and spring length to get the spring...I found out, that when you create expression, you have to use 360 degrees instead of pi()...for example xt = rad*sin(360*t)
Regards
Vit