I have this armature:
Original object
I try make rotation of bone, but the deformity is less than the rotation of the bone and
object is not attached to the bone:
Deformation 2
How to fix it?
The odds are that the weights aren’t good. If a piece of a mesh doesn’t follow a bone completely, it is (almost?) always because it is weighted to another bone as well.
From the specific looks of your deformation, I’d suspect that you had a mesh with backwards normals that you tried to autoweight. Check/fix your normals and re-weight.
Thanks for answer, but how do it (Check/fix your normals )?
Can you check it’s possible do it? Thanks.
Blender file
First, change your mesh back to a solid display, then enable “face orientation” in your overlays:
It’s red, which means the normals are facing the wrong direction.
To fix, enter edit on the mesh, select all vertices or all faces, and use a “recalculate normals” operation, which is ctrl n for me and probably also for you. Then, it turns blue.
After that, reparenting with automatic weights gives much better results.
Many thanks! Now all fine.