Slewing bearings has a unique bearing capacity and is usually used on lifting machines, excavators, rotary tables, wind turbines, telescopes and tank turrets. With the improvement of machining methods and the update of design concept, today's slewing bearings can be applied to smaller, more complex and more sophisticated applications.
In the machine tool industry, the slewing bearings of standard structure is applied with high precision grade and preload to eliminate gap and reduce vibration. The radial runout of the slewing ring and the diameter tolerance range from one thousandth to one thousandth of an inch (2. 54 tan), compact structure, small section size, and the diameter range can be as small as 50 mm(this type of slewing supported steel ball size is smaller than the traditional heavy series slewing bearings steel ball size). This prompted the designers to reconsider the traditional slewing ring configuration.
