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Tolerances, Continued Basic shaft The basic shaft system is a system of fits in which the design size of the shaft system is the basic size and the allowance applies to the hole. Figure 3-40 illustrates the basic shaft system. Figure  3-40.—The  basic  shaft  system. In the illustration, the maximum shaft size is the basic size. To obtain the minimum hole diameter, assume an allowance of .003 inch and add that to the basic shaft size. Arbitrarily selecting a tolerance of .002 inch, add the tolerance to the hole and shaft to obtain the maximum hole (1.505 inches) and the minimum shaft (1.498 inches). The clearance fit is the difference between the smallest hole (1.503  inches)  and  the  largest  shaft  (1.500  inches)  or  .003  inch.  The maximum clearance fit is the difference between the largest hole (1.505 inches) and the smallest shaft (1.498 inches) or .007 inches. Determine the minimum hole size of an interference fit by subtracting the allowance (.003 inch) from the basic shaft size (1.500 inches) or 1.497 inches). To convert basic shaft size to basic hole size, add the allowance for a clearance fit or subtract it for an interference fit. 3-45

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