Hello all! First time posting here... :)In an assembly, how can I find the exact center of those 3 parts andHow can I constraint those parts to rotate from this center?Hope my english is clear enough :(Thank you in advanced!

Sorry if this is late, and I hope you got what you're looking for.In any case, if you're in the assembly environment, you can set rotational constraints for the different parts/subassemblies.