Selecting variables in assembly optimization study

[jcobreros]

Hi, I'm kind of new to ProE/Mechanica.
I can do a stress analysis on a very simple assembly and it works properly.
The assembly consists of two cylinders, one inside the other one (which is hollow). I created both parts by creating a sketch, drawing a circle and then extruding.
Like I said, I can do stress analysis with no problem, so I can mate the parts, apply loads and constrains, and see the stresses and deformations.
Now I am trying to do an Optimization Study, which I have done before on a single part. But now when I try to define the variables to modify and click on the "Select Dimension from model" button, I can't select any of the radius, I can only select the extrude lenghts.
With a single part what I had to do is select the sketch and then it would show me and let me select the radius. But in assembly mode I can't go into details of the parts.

Does anybody know what I am doing wrong? I'm short on time and I'm starting to get desperate. So I'd really appreciate any help!
Thank you in advance.

 

[grimmy65]

You might try creating a parameter to drive the diameter then use the new parameter for the optimization study.

 

[Bauer1983]

What you might also be able to try is to use thicken sketch. Because it seems you can not select sketch dimensions but you are able to select feature dimensions. I have tried out your problem on my own computer and I was able to select sketch dimensions so it is strange you are ubable to.