best way to model this shape?

[munchichee]

I have this little air bellow actuator modeled in it's closed position, but need to show it in it's open position which basically bulges out only on one end. I'm not too familiar with surface features and was wondering how to go about modeling this. I tried applying a warp to it but couldn't seem to get it right.


View attachment 3541

 

[prohammy]

Munch,


Take a look at both of these threads, they might help
[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=33 759&PN=1[/url]
<?:namespace prefix = o ns = "urn:schemas-microsoft-comfficeffice" />
[url]http://www.mcadcentral.com/proe/forum/forum_posts.asp?TID=33 818&PN=2[/url]



Kev

 

[munchichee]

Thanks prohammy but it's not really a matter of displaying it in different states or making a flexible component because i'm showing 3 open and 3 closed on x-sec in dwg. I just need to figure out how to model the part in open position with that geometry - the part is just a revolve right now and that won't work with an asymmetrical section at an angle. I figured a boundary blend or some kind of surface feature using curves could do the trick but haven't done much surface modeling.

 

[vlad1979]

I think you should break this into smaller pieces. By looking at your picture I would say only the main portion is changing those R1.0 and R1.5. So I think you should make first the circles with these radiuses. A var sec sweep could work here, looking and the section I think a trajpar function should work. The others on the exterior can be done later.


You could make all in 2 or even one feature like I did just now with a swept blend but I'm not very happy with how the sections are sweeping along the trajectory. But maybe because I didn't pay much atention to details. Looks like this, I made only half and then mirror it, looks like crap:


View attachment 3542


View attachment 3543


I think the first one should work, a var sec sweep with a trajpar function for the section. See help for an example of var sec sweep using relations with trajpar, to understand how it works.


And I think you can even make this with instances, to put the circle that is variable in an family table and have thegeneric closed and the instance open. Just a thought.

 

[Miko]

hi munch ... if you dont need to make thatmodeltotally parametrical ..than just use the Warp featureto createthatOpen position....and simple revolve featurefor closed position. but of course..if you will use warp than it will be not accurate. I mean that radius R1,5..

 

[munchichee]

yeah that's what i tried first, but when I modified the revolve feature of the closed position with warp it would always deform or squash what i need to stay in tact. The dimensions for this don't necessarily have to be exact considering it is a purchase part, but i just need to show it in the assembly drawing in the open position. I'm getting closer using the style feature and curves but that's all new to me. I understand WHAT i have to do - just not sure the steps to take to get there.

 

[vlad1979]

Like Miko said warp tool.


And given the fact that this is my first time using the warp tool I think it looks prettygood.I tried the other warp optionsbut in the endI find that sculpt tool is the one for this job.


I did not find any controls over those points, you only drag them where you want. So what I suggest is first put the model in front orientation, then drag the points. At least like this you can drag everyone of them one on top of the other.


How it works: create the main revolve the closed position, then insert / warp. Select the geometry created (the revolve thing) then click ok then select the main csys. Then select start sculpt tool and a mesh will appear, click on switch mess orientation until it gets on the side. Then put the model in front orientation. Then start draging the points indicated.


View attachment 3570


View attachment 3571


View attachment 3572


Disregard the curves, those are left overs.


2007-05-08_122753_part1.prt.zip


Then create a family table, and the instance call it open position, and put the warp feature in the family table.


And I guess you can shell the part.
Edited by: vlad1979

 

[michael3130]

Munchichee,


You may have solved this problem already but have a look at the attached file. This is the basics of how I would go about creating the shape you're looking for. I have created a number of parts in the past were I needed to see the different states so although you say you don't need both states I have always found it best to do them anyway.


I have created a family table with the 2 states.


Have a look and if you need any more help, let me know.


Michael2007-05-10_071233_Bellows.ZIP