Otherwise, the drawing would be embroidered with geometrical tolerance indications.

Before applying general tolerances, their concept must be agreed upon.

This concept, developed in the International Organization for Standardization (ISO) is illustrated in detail in this chapter.

Because the general tolerances are so large that they are respected in any case, there is no disadvantage in applying them to features that would allow wider tolerances.

The general geometrical tolerances should not be smaller than the normal workshop accuracy.

The normal workshop accuracy (regarding geometrical deviations) depends on the accuracy of the (most inaccurate) machine tools, and on the accuracies of adjustment of the workpieces during re-chucking on the machine tool.

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