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Methods are presented for analyzing large diameter bearing applications in order to determine the broadest dimensional tolerances which are consistent with requirements of fit and function. Industry conventions for dimensioning and tolerancing are presented with special reference to position tolerancing. Practical dimensional tolerances for various size and grades of bearings are listed. Gear tolerances are discussed relative to large bearings which are equipped with integral gearing.

Increasing numbers of large diameter bearings are being used in turntable-type applications, replacing earlier roller and track and spindle arrangements. This paper aims to acquaint design engineers with the current state-of-the-art in the use of these bearings, with special reference to application in power cranes and shovels, gun turrets, aerial basket devices, utility derricks, and the like. Features of various style bearings are discussed. The equipment designer is provided with guideposts for selecting bearings and for designing suitable bearing mountings.

Demands for greater capacity per unit size necessitate increasingly careful consideration of mounting structures and fasteners in swing bearing selection. In order that the task be approached as intelligently as possible, this paper brings equipment designers up to date on swing bearing design. Mounting structures, bearings, and fasteners should be considered as an interdependent system to determine design requirements and application limitations. Accordingly, different bearing types are discussed and methods for calculating their capacity are presented. A test procedure which is being used to gain additional knowledge of optimum swing bearing system design is outlined.