Question 4.4: Use Table 4.5 to determine the tolerances of hole and shaft ...
Use Table 4.5 to determine the tolerances of hole and shaft fit with RC8 for a basic size of 0.50.
Firstly, the basic size is used to locate the rowwhere the size falls in the given range: 0.5(0.40, 0.71). Secondly, the fit RC8 is used to locate the column. Thirdly, the tolerances at the intersections of specified column and row are interpolated as the dimensions of hole and shaft as
Hole : 0.5000^{0.0028}_{0.0000} Shaft : 0.5000^{-0.0035}_{-0.0051}
Note the limits in Table 4.5 has a unit of thousandth of an inch.
In the ISO system, an alphanumeric code called the international tolerance grade number (IT#) is used to specify the tolerance ranges of fits, an uppercase represents the hole tolerance, and lowercase represents the shaft. Figure 4.35 shows an example of the fit specifications in the ISO system.
