Hey @SamLopes,
It is very likely that a collision component on your arm is what is hitting, not the actual skeletal mesh, though I can’t say for certain without seeing the list of components in your robotic arm. If that is the case, you’ll need to have the collision component ignore the channel of the actor it is trying to grab, so that the actor will actually make it through the collision component and collide with the mesh.
If at all possible, can you share a screenshot of your component hierarchy, collision settings, and any construction script you may be running on these actors? Also, please ensure your skeletal mesh has “Simulation Generates Hit Events” turned on.
I hope this information helps, and good luck!