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             SELECTIVE OUTLINE OF BEARINGS
                   There are various types of bearings with different sizes. To meet the designed purposes, it is 
               necessary to select correct bearings according to the combined analysis result among the practical
               factors such as the mechanical conditions, the technical requirements , the space data around  the 
               bearings and market and economic considerations.
                   Due to the fact that the bearings are selected as per the decided bearing diameters , the first 
               factor is to check the fitting space and the way for fitting on the basis of the  inner diameter of
               the bearings before looking for the special type of bearings.
                   Secondly, it should be necessary to compare the bearing lives and  then determine  the  size of
               the bearings according to the results of calculation of bearing life under loads.
                   Lastly , it is helpful to consider the inner specs of the bearings such as the accuracy  grades,
               inner clearance, retainer, lubrications etc.
                   Fig 4 shows general procedures for bearing selection and the conditions that should be considered
               in application. Though  these are not compulsory ,  they  will help to  satisfy  the  most important 
               technical requirements.

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