Grounding a demoted assembly and losing component motion

[jyager]

Pretty new to inventor so my workflow could be way off.

I have a damper, I started it with the bottom frame member, which was gorunded at origina when it was placed and I built the rest of the damper from there. All my constraints for blades and linkages and all related parts were able to move (with the damper held in place in "space" by the grounded frame member.

For parts list purposes I need all 4 sides of the frame to be one BOM item so I demoted the 4 frame pieces as one inseperable assembly.

After that all motion is lost in the main assembly and I can drag it all over "space" since I lost the bottom frame member ground point. I can ground the demoted frame assy to lock it down, and drive the constraints to make the damper parts move to create positional representations.

I guess I'm just wondering if I'm not really supposed to be able to "move" components arbitrarily and I should just be driving the constraints all the time in the first place...I'm just not sure why the motion is lost after the initial ground point is lost.

[MariaManuela]

Hello!

What is your version of Inventor? 2014?

You already put these assemblies as flexible?

Right-click a subassembly in the graphics window or the browser, and then select Flexible. An icon denoting the flexible state marks the subassembly in the browser.

Flexible assemblies:

http://wikihelp.autodesk.com/Inventor/enu/2012/Help/0073-Autodesk73/0460-Assembli460/0536-Represen53...