elliptical coil spring

[Cadbee26]

Hi

I am trying to draw an elliptical coil spring with top and bottom radius of 2 in and center radius of 3 in with 5 turns and spring ht of 5 in. the wire guage is 0.1in.

I could draw a cylindrical spring with helix and sweep command but dont know how to draw an elliptical coil spring. please let me know the commands or steps to get it. Also, I have problems in getting dimensions of radius and height for the coil spring. I use autocad 2014.

 

Thanks

[JD Mather]

Something like this?

 

[Cadbee26]

Hi Thanks for replying. The image looks more like a cylindrical coil. is the top and bottom radius smaller than the center coil radius. I am trying to draw the one on the pic. I want to know how it can be done in AutoCAD 2014

Edited November 25, 2013 by Cadbee26

[JD Mather]

I have no idea how to do that in AutoCAD, but it would be fairly easy in Autodesk Inventor. (if you had posted that picture in original thread - that is what I would have modeled)

[Cadbee26]

thanks. no problem

[nestly]

HELIX with a bottom radius=2, top radius=3, turns=2.5, tWist=CCW, height=2.5. That should take care of the "bottom" half, then flip it over for the top half. Sweep the top and bottom half separately then UNION them, or Explode both helix into Splines and join them. (Disclaimer... AutoCAD Helix are not particularly accurate)

 

[designerstuart]

nestly you beast

certified cad junkie!

(very impressed)

[JD Mather]

From the image it also looks like the "helix" is variable pitch with a transition to flat at the ends.

[SEANT]

Too pressed for time to elaborate but here is the result of using this plugin:

http://apps.exchange.autodesk.com/AMECH/2014/en/Detail/Index?id=appstore.exchange.autodesk.com%3astsc_uvvectormap_windows32and64%3aen

When I get back to the desk – and if there is any interest – I’ll explain the process.

spring.dwg

[SLW210]

Thread moved to AutoCAD 3D Modelling & Rendering forum.

[Cadbee26]

@nestly: that was awesome. thanks for your help..

@seant: Thanks for your help and the drawing. I would appreciate if u can list the process as I am learning autoCAD

[SEANT]

I missed the height information in the first post - consequently, I modeled the spring based on the apparent proportions to the image in post #3.

 

 

@nestly: that was awesome. thanks for your help..

@seant: Thanks for your help and the drawing. I would appreciate if u can list the process as I am learning autoCAD

 

 

The process is fairly complex, not to mention requiring a plug-in. Does your computer situation allow for third party plug-ins?

[Cadbee26]

Drawing1.pdf

 

@nestly: Iam getting like this one in the pdf.. what mistake did I do here

[nestly]

From what I can tell, you may have copied/rotated the bottom half without changing the UCS. When my cursor goes off-screen (just before ROtate in the animation), I switched to Front view. (Note the XY axis orientation of the UCS icon in the animation) You can also use 3DRotate or a number of other methods, I just thought switching to Front View was quickest for demo purposes. Sorry for the confusion.

 

[Cadbee26]

@nestly: Thanks. Ya tried tat and got it. One more question, how to you provide dimensions like dia and length for coils. bcoz its not recognizing