What type of bearing do turntables operate on?

Turntables typically operate on large shear ball-type bearings due to their ability to support heavy loads and allow for smooth rotation. These bearings are designed to handle the weight and stress of the aerial ladder while also providing stability and flexibility in movement. The shear ball-type configuration is particularly advantageous in applications where significant weight and forces are present, as it can distribute these loads effectively and reduce friction during operation.

Ball bearings and roller bearings, while effective in different contexts, may not provide the same level of load-bearing capacity necessary for the demands placed on a turntable during aerial operations. Magnetic bearings, on the other hand, are generally used in specialized applications where frictionless operation is required, but they are not practical for the structural and operational demands of a turntable in fire service operations.

Understanding the function of large shear ball-type bearings in this context emphasizes the importance of selecting the appropriate bearing type to ensure safety and performance in aerial ladder applications.