IN3D random stuff( ninja weapon)

This is something that i created when i am free, i try to create a ninja weapon that is similar to those found in Naruto. when i doing this , i found out that there is a problem in Maya .In boolean , union, difference or intersection, the command is not accurate and it also give me problems , such as when click union, the whole object disappear.  
when doing this object i try to use blinn , as seen the the weapon is made out of metal i think  it is the best to use blinn to show how light reflect on the surface.