Modeling Challenge

[PRStockhausen]

Here is a modeling challenge from a previous job.


The dimensions shown are the only driving dimensions for the part.

 

[PRStockhausen]

A view of the part:

 

[jsantangelo]

This can be done very easily with a graph driven VSS. Set it up much like the Leo Greene Helical video tut.

 

[PRStockhausen]

I did not use a VSS with my model. I have with other models but did nottake the time to figure how to with this one.

 

[jsantangelo]

Sweet.

Here's my screen cap using the LG method:

<div style="text-align: center;">

</div>
Edited by: jsantangelo

 

[jsantangelo]

And the video breakdown

<div style="text-align: center;">http://santangelo-eng.com/proe_tuts/challenge_007.swf

http://santangelo-eng.com/proe_tuts/challenge_007.swf


<div style="text-align: left;">How did you do it? Is your technique robust enough to change your model on the fly like I do at the end of the video? Does the note on the bottom in the first post drive any of the other dims or is it just a note on how it's going to be used?
</div>

</div>Cheers!

Edited by: jsantangelo

 

[jsantangelo]

It can then be transformed into a square spring with ease

<div style="text-align: center;">

</div>

 

[hopper213]

Ya maked it the way Leo does in his tutorials. How did you do the square shape? With sketch and relations?

 

[jsantangelo]

Ya maked it the way Leo does in his tutorials. How did you do the square shape? With sketch and relations?

Same way except you do an Intersect between the square surface and the helical surface to create a helical square path for the wire. The helical part was extended beyond the original to ensure intersection of the surfaces. See video below.

<div style="text-align: center;"><a href="http://santangelo-eng.com/proe_tuts/square_spring_01.swf" target="_blank" target="_blank">Square Helical Spring



http://santangelo-eng.com/proe_tuts/square_spring_01.swf</a>
</div>


Another way to make the part is with a spinal bend. Although the wire diameter seems to thicken when it bends.


<div style="text-align: center;"><a href="http://santangelo-eng.com/proe_tuts/spinal_spring.swf" target="_blank" target="_blank">Spinal Spring



http://santangelo-eng.com/proe_tuts/spinal_spring.swf</a>



<div style="text-align: left;">Cheers!
</div>
</div>
Edited by: jsantangelo

 

[tobbo]

about the spring...



[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=37 647&PN=1&TPN=1[/url]


[url]http://www.mcadcentral.com/articles/templates/proe.asp?artic leid=10&zoneid=2[/url]


[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=37 717&KW=spring[/url]

http://www.e-cognition.net/Video/Helicals.html

[url]http://www.imakenews.com/ptcexpress/e_article001011621.cfm?x =bc7qVh0,b7qh6mCp,w[/url]

//Tobias

 

[zpaolo]

Another way to make the part is with a spinal bend. Although the wire diameter seems to thicken when it bends.

This is consistent with the way spinal bend works: it's as if the "space" where the part is is warped, so the part of the model that is closer to the center of the curve is squashed, and the part that is "on the outside" of the bend is enlarged.

Paolo

 

[PRStockhausen]

My spring takes into consideration that closed and squared spring starts of with a portion that is flat. Why I did not use VSS, is that I could not figure out how to do those portions that are flat using a cylindrical coordinate system. I start and end with a torus shape created as a sweep along a portion of an arc. The remaining half turns starts there and ends one wire diam from the start of end of the spring. Then I create a curve by equation between the two closed turns. To make the transitions smooth, I add points to the curves from the flat portion at .1 and .9 ratio to the active coils and trimed them back, then added curves from point to point and make them tangent. Note the curves from the flat half turns to the active portion (before trimming) are also curves by equation. Here is the model tree:





Here is a shaded from of the side.

 

[tobbo]

sounds cool. Can you upload the part?


//Tobias

 

[jsantangelo]

My spring takes into consideration that closed and squared spring starts of with a portion that is flat. Why I did not use VSS, is that I could not figure out how to do those portions that are flat using a cylindrical coordinate system. I start and end with a torus shape created as a sweep along a portion of an arc. The remaining half turns starts there and ends one wire diam from the start of end of the spring. Then I create a curve by equation between the two closed turns. To make the transitions smooth, I add points to the curves from the flat portion at .1 and .9 ratio to the active coils and trimed them back, then added curves from point to point and make them tangent. Note the curves from the flat half turns to the active portion (before trimming) are also curves by equation. Here is the model tree:



Here is a shaded from of the side.

That seems like a lot of set-up for this part.

Please share if you can as I'd like to inspect what you did

.