k mounting designs - continued EXAMPLE #1 - Calculating RIC Reduction Using a Spherical Roller Bearing with Tapered Bore
Given bearing number 22328K C3 (140 mm bore with C3 clearance) is to be mounted on a tapered shaft. Using a set of feeler gauges, RIC is found to be -
RIC = 0.178 mm (0.007 in.)
Suggested Reduction of RIC Due to Installation = 0.064 to 0.089 mm (0.0025 in. to 0.0035 in.), found in chart on page 51.
Calculate the clearance after mounting -
0.178 mm - 0.076 mm = 0.102 mm or
0.007 in. - 0.003 in. = 0.004 in.
Note: For this example, the value of 0.076 mm (0.003 in.) was obtained by taking the mid-range value of the upper and lower limits found in the table on page 51.
Therefore, the locknut should be tightened until RIC reaches 0.102 mm (0.004 in.).
It should also be noted that the value obtained by reading the Suggested RIC after Installation directly from the table is 0.056 mm (0.0022 in.). This differs from the value calculated in the above example. The value taken directly from the table is provided as a minimum value. It is not suggested to use a calculated value that falls below this minimum.