ABSTRACT
Overview It is impossible to design a machine for a task without knowing what that task is. This simple statement is so central to the whole design effort that it bears repeating. It is impossible to design a machine for a task without knowing what that task is. This means that it is essential to start off every mechanical design project with a clear definition of the goal of that project. What, exactly, is the effect that needs to happen? Walls shifting? Doors opening? A lift? A fly effect? The designer’s drawings will be the first source of this information of course, but there will be numerous questions those drawings will never answer. What bounds or limitations beyond what is shown in the set design are placed on possible solutions to the problem an effect poses? These bounds can be those set by the obvious issues of budget, shop labor skills, shop space, or available time, for instance. They may also be defined by less often considered and even obscure issues such as local codes requiring biodegradable hydraulic oil, ambient temperature effects on nylon lock nut holding ability, or altitude based derating of air compressors. It is the goal of an effect design specification to clearly state every relevant requirement and limitation that is placed upon an effect so that the mechanical design process can proceed with full knowledge of exactly what needs to be done.
