Rigid Group Broken By Move and Align Tool

[therealsamchaney]

The Rigid Group tool is supposed to lock two components' relative positions so they both act basically as one when moved or adding joints, but actually using the Move or Align tools on one of these bodies will break this relationship and they will not move together as one.

The description of the Rigid Group tool says "The components are treated as a single object when moved or when joints are applied". The usage of the word "moved" here makes it seem that the Rigid Group constraint will be maintained when using the Move tool but this is not the case. If you make a Rigid Group between two components, then use Move or Align on one of them, that one component will move, but the other component will not, thus breaking the Rigid Group relationship.

I think that the Rigid Group (and any other joint in the assemble menu) should supersede any other moving function like Move/Copy and Align.

Or, at the very least, the description of the Rigid Group should be changed to remove the word "moved" as the constraint is only maintained when using the Joint tool.

Thanks,

Sam

[jhackney1972]

I have tried to prove to myself that what you say is true but I cannot.  Can you attach a model that shows this behavior and attach a Screencast showing your process?

[davebYYPCU]

Your 1st quoted statement is Correct, but without an example to talk to,

you will need a concise knowledge of the difference between Component Origins and bodies in the component. 

Rigid Groups hold ALL the groups' component origins in a static relationship.

if you move a body, (within it's component) how would a rigid group be involved at all?

When you move a component with the Move tool (unlikely) or Joint, the Rigid Group kicks in to maintain the static relationship with Components in the Group.

To highlight the no example problem with guestimate statements, 

Would you say this is 3 components in a Rigid Group, or One component with 3 bodies.

Might help....

[therealsamchaney · Accepted solution]

This was just me having a brain fart moment. I had Bodies selected in the Move command when I thought I'd selected Components. The tools work as expected when moving components. I have requested for this thread to be deleted.

[davebYYPCU]

In your example he is moving the cylinder body off the plate, and complaining that the group is not maintained.

In your move command select body.

Might help....