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Panchal, Engineering Drawing, Charotar Publishing house, Drawing Describing any object information diagrammatically. This ensures that irrespective of the size of the units, large or small, the same fit is achieved.
This is not necessary in practice, and BS advises that a selection of only ten fits, with a unilateral hole basis, covering diameters up to mm, will prove suitable for the great majority of applications.
Normally use only these preferred fits. These preferred fits, with a brief description of their function, are summarised in Table 2. All holes suitable for a unilateral hole basis system have the tolerance letter code H.
The Shaft Based system is sometimes used for preference though, particularly when stock bar material is used for the shaft, or if several parts having different fits, but one nominal size, are mounted on a common shaft diameter. Note that the basic size is divided in size ranges, for example, 6 to 10 mm diameter. This means for size of holes or shafts over 6 up to and including 10 mm the figures in that Row should be applied to the basic size to achieve a given tolerance zone and class of fit.
Example 1 Achieve a Close running fit for a basic size of 7.
Values need to be taken from the row: 6 up to and including 10 mm. Values need to be taken from the row: up to and including mm.
But, in both cases, the class of fit, and hence the manner in which this pair of parts will perform together, is the same. Thus any pairing of holes and shafts whose diameters lie within the range given by these values are equally acceptable for achieving the class of fit, and hence functional performance, that is required. All of the notes so far have referred to fits in cylindrical terms, ie holes and shafts.
This is by far the most common occurrence, but this system is also adaptable to fits between parallel surfaces, typically rectangular drive keys in rectangular slots. Choosing the correct fit The notes so far have explained the principles and representations of limits and fits.
The designer however is faced with the more fundamental task too of selecting the correct fit to use. This requires considerable experience, but some general guidelines should be noted.