A difficulty using rigidbodies So basically i'm trying to do a ring attached to small chains...
However when i press Alt+A to animate, the "ring" detaches from the two bottom "chain"
Mass of "ring" = 30kg
Mass of each chain link = 4kg...
Scale are x= 2.376m
          y= 1.422m
      and z= 28.431
I learned the chain thingy from Blender Guru and he said something about the object being big...i'm not sure
Also the top 2 chains(left and right) have Active Rigidbodies but arent Dynamic, the rest is dynamic (even the ring)  Someone help pls...


here is my file:
thanks for the file, it was easy: it's the unapplied scale for all chain rings (even the bigger one). They all have some scale like 1.846... 

applying each (with CTRLA then "scale"), it becomes 1.0 and it behaves well...