The relationship is most healthy when there is a continuous discussion. For every project, engineers contribute design constraints (this material, that thickness, etc.) and mechanics contribute installation contraints ("that would require a 3/4" long screwdriver", etc). If there's a misunderstanding, through the discussion, these facts come out until there is an understanding. Until that happens, each of us risks going back to our little spheres and screwing things up for the other one.
Steven Fahey, CET