Sunday, July 20, 2008
Tolerancing
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 permissible variation from the dimension.
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
The method of expressing a tolerance on a dimension as recommended by the British standards is shown below:
posted by yjlevia at 1:31 AM
