It’s not the RBC that matters-- leave it unparented. Its orientation at frame 1 is the only thing that matters.
What matters is the body on the other side of the RBC, the handrail. (And as skleembof suggested, you want to make sure that it has the animated trait, not passive.)
A file would help to diagnose exactly what’s going wrong.
Thank you very much, both of you. The example file pretty much shows what I want.
Toggling “animated” property for handrail made it work, but another issue occured.
After animation of the platform has finished, the lampshade “goes crazy” and moves around. It should just swing a bit, because of the platform’s movement, and then slowly finds it’s position, considering gravity.
Fixed your problem. Here’s the blend file: 2_example.blend (1.1 MB)
The problem is that you had duplicates of the empty, handrail, and lamp objects in the rigid body world collection.. Why they were duplicated I have no idea, maybe you did something weird while experimenting with the rigidbody settings. The 2nd handrail object was the one that was messing up the physics at the end
To fix it, go to the outliner and change it to blender file mode, then go to collections, find rigidbody world, and delete the duplicate objects.
Blue arrow is where you change outliner to blender file mode, red arrow shows duplicates
