Parametric design with rigid group not working

[Anonymous]

Hey all,

in my current design my rigid group is not working as expectet. Whenever I change a parameter to another value only a part of the rigid group is moving. The other remains at the same position. What am I doing wrong?

For more information see the screencast (from second 48 to 52 it shows the problem, while the cast to second 48 only shows what I had done before the problem occured)

Design: https://a360.co/2Rtij2I

Thanks in advance for all ideas.

Filip

[jeff_strater · Accepted solution]

I couldn't completely follow the video (too fast), but I think I get the gist of it.  Rigid group just captures the relative positions of the components at the time the group is added.  There is no geometry reference involved (which is why you don't have to select geometry).  Think of Rigid Group the same as As-Built Rigid joint.  When you change the width of the model, there is no timeline object which will position the caster components with respect to the new position of the vertical plate.  The rigid group is working correctly - the group is still rigid, as you can see in the screencast: rigid group after edit  , but you have no features that capture that rigid relationship in the position that I suspect you want.

What you need here is a Rigid Joint, where you pick geometry that constrains the caster to the position you want it relative to the vertical plate.

[davebYYPCU · Accepted solution]

I believe you are using the Align Command to place the wheel.

Joint is less work, and makes them glue to the board,

Align is no glue.

One joint for first one, copy position second one, and Rigid Group for board and two wheels.

Might help....

[Thegreatrandino · Accepted solution]

Rather than moving the components and then making a rigid group, create a rigid joint.

It looks like you are inserting a component, or a mcMasters. Accept the location. Now select an appropriate origin on the part and and a corresponding origin where you want the part to be. As part of the Rigid joint you can flip, and move along each axis.

The screen cast was too fast to watch. Instructions for creating a screen cast are here:https://forums.autodesk.com/t5/fusion-360-design-validate/guide-how-to-post-a-question-amp-create-a-...