The Detailed Design-

This includes providing detailed manufacturing instructions in the form of part drawings, assembly drawings and process instructions. Specifications of each part, components or subsystem are defined so that a manufacturer knows exactly what has to be made and how. Before such description are finally arrived at, the designer has to bring in the considerations of tolerance. Perfect accuracy cannot be achieved with any machine or process. No machine, no matter how precise, and no workman no matter how skilled, can produce two components that are exactly alike.

Designing for Production-

As soon we start giving a physical shape to an abstract concept, we must start considering the question of how it will be produced. Designing the structure of a tall building must be accompanied by considerations of how it is going to be erected. If the building is more than a few stories high, we cannot use ground based cranes for work on the higher levels. A design is worthless if it calls for higher accuracies than can be obtained with the machines available to the producer. A good designer always asks himself the question-
• Can this is made with the available machines and skills?
Every method of manufacture has certain strong and certain weak points. A good design utilizes the strong points of the available manufacturing methods.