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In my introductory article, “Airworthiness — A Systems Approach”, last March, I expressed the hope that eminent engineers from all the disciplines and activities on which “total airworthiness” (my phrase) depends, would be persuaded by Aircraft Engineering to contribute articles on their own specialisations.

The playwright identified seven roles for man to play as his life unfolded. In the realm of airworthiness, it is possible to identify six roles for structural testing as a project completes its life cycle. These roles coincide with the six phases of development of a project:

The paper covers work done at Salford University and identifies those aspects of tribology which are important to both the design of metal working machines and to the tool/workpiece interaction. After identifying the important tribological problem areas some examples of possible methods of solution are indicated using the work at Salford University for typical examples. Inevitably the paper identifies many questions to which there are currently very limited answers and thereby indicates the areas for further research. It should however be stressed that the author does not claim to have produced a comprehensive review on tribology in manufacturing engineering. Rather the style of the paper is to question the way forward and in some cases even to propose answers.