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Tolerances

This article explains the concept of tolerances in engineering drawings, highlighting that it is unfeasible to manufacture products to exact specifications due to varying manufacturing processes. Tolerance values indicate the maximum allowable variation in dimensions, crucial for effective communication in manufacturing. Each dimension on a drawing must include tolerance, which can be a general value applicable to multiple dimensions or a specific value for an individual dimension. Examples of how tolerances are presented in engineering drawings are also provided for better understanding.

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Tolerances

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  1. Tolerances

  2. TOLERANCES – the basics It is not possible in practice to manufacture products to the exact figures displayed on an engineering drawing. The accuracy depends largely on the manufacturing process used and the care taken to manufacture a product. A tolerance value shows the manufacturing department the maximum allowable variation from the size. • Each dimension on a drawing must include a tolerance value. This can appear either as: • a general tolerance value applicable to several dimensions. i.e. a note specifying that the General Tolerance +/- 0.5 mm. • or a tolerance specific to that dimension Note the larger size limit is placed above the lower limit.

  3. TOLERANCES – some examples Here are some ways which you will see tolerances shown on drawings, it is the way you should show tolerances if asked to do so.

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