What are Turntable Bearings and How are They Used?

Turntable bearings are four point contact thin section type ball bearings that contain two sets of holes, in the inner and outer rings, for easier mounting. They are sometimes also known as slewing ring bearings, and they can accommodate axial, radial and moment loads. As well as the mounting holes on the outer rings, there might also be internal and external gears in place, and the bearing isn’t mounted on a shaft, instead being attached directly to a seating surface. There are many different types of turntable bearing that will suit different applications, so it’s important you pick the correct types and size.

Before buying bearings, it’s important to establish all requirements, from the brand and purpose to the exact size and type. Bearings websites are the best place to buy bearings and get good value for money, but they are only useful if you know exactly what you’re buying. Turntable bearings aren’t cheap and though they offer good value for money, you don’t want to be purchasing the wrong kind. This is why it’s essential to check all requirements; if you have any questions, it’s always best to check with a bearing supplier before buying.

Applications for turntable bearings

Slewing ring bearings have many uses in applications requiring rotation, with low velocity. Some common uses for turntable bearings on vehicles include farm vehicles, and light truck trailers. In fact, some turntable bearings might be known as trailer rings as well as turntable bearings, because they let trailer steering axles oscillate. They might also be used in material handling, light duty industrial applications, and welding manipulators. They are often cheaper than proper slewing rings, which is sometimes why they’re used in other applications as well. If you are using trailer rings as opposed to true slewing rings, be aware that they will not be suitable for use when there are high overturning loads, suspended loads, or non-vertical axis rotation. Also be aware that trailer rings are different to precision bearings.

The makeup of a slewing ring or turntable bearing

Single row and double row slewing rings are different to each other in the number of rows of balls. When there is a single row, there will be a standard bearing raceway that has four points of contact. This doubles for double row slewing rings. It’s important to understand the differences, and also to know the differences between true slewing rings and trailer rings, before putting in a purchase. Bearing suppliers will have a selection of trailer rings for use with machinery, as well as turntable bearings/slewing rings. Bearings will be available in various sizes as well, ready to be fitted into the appropriate application. It’s always advisable to check compatibility beforehand and understand maximum possible capacities. Turntable bearings can only be used correctly when used with a compatible type of machinery, and in the right kind of system. You can sometimes get access to lower prices if you order bearings in bulk too. Enquire before you buy to get a full view of your options.