Geometrical tolerances are applied over and above normal dimensional tolerances when it is necessary to control more precisely the form or shape of some feature of a manufactured part, because of the particular duty that the part has to perform. In the past, the desired qualities would have been obtained by adding to drawings such expressions as 'surfaces to be true with one another', 'surfaces to be square with one another', 'surfaces to be flat and parallel', etc., and leaving it to workshop tradition to provide a satisfactory interpretation of the requirements.
Was this article helpful?
Realize Your Dream of Becoming a Professional Pencil Drawing Artist. Learn The Art of Pencil Drawing From The Experts. A Complete Guide On The Qualities of A Pencil Drawing Artist.