# VARIABLE PITCH RECTANGULAR SPRING

#### v_shankar1979

##### New member
Hi there,

Can anybody explain the step by step procedure for creating the variable pitch rectangular spring.

Shankar.

#### v_shankar1979

##### New member
Hey guys,

I solved the problem on my own. If anybody would like to know plese let me know I will be glad to anwer.

Make it a great day!

Shankar.

#### rishidass

##### New member
Congratulations!!!

#### mdemirci

##### New member
Hello Shankar,

Please let me know the procedure.

Best Regards,

Mehmet

#### v_shankar1979

##### New member
Hi Guys,

Here is the procedure.

feature>creat>protrude>surface>

and then go to sketch mode. Creat a rectangle filleting the corner. Extrude the feature. Again in the surface mode create a helical surface. Take care that both helical surface and rectangular surface should interfere through out the length of the rectangular surface. Then create a datum curve at the intersection of these two surface.

Now we just have to sweep a profile . This should be done in solid mode.

Make it a great day!

Shankar.

##### New member
Sounds like an easier way would be a helical sweep, which requires you to define a profile and a cross section.

When sketching the profile, drop datum points wherever you want the pitch to change.

Then you can create a pitch graph. Select the datum points, which will be on the x-axis. Sketch the pitch on the y-axis.

David Martin

Torgon Industries

#### kvision

##### Moderator
Your solution does not create the correct geometry. It looks close but it isn't. The curve sort of wobbles. Start with the same first surface then create a formed curve on that surface. This will get you the correct geometry. make the same geometry and then copmare.

If you have a KinetiVision account there is a video for this.

http://www.kinetivision.com/quicktips/non_circ_helix.htm

For ProE Central members

http://www.proecentral.com/portal/tips/playvideo.asp?id=58