Q: Which operating and design parameters are relevant?

Slewing Ring Bearings are designed for operation between -20 °C and +60 °C, with a maximum rotational speed of approx. 1 rpm. The relubrication intervals depend heavily on the operating conditions: 300 operating hours in a protected indoor environment 100-200 operating hours for normal outdoor use 50 operating hours under dusty or damp conditions Central lubrication is recommended for continuous operation. The quantity of grease depends on the running circle diameter (e.g. 20 g for 200 mm / 220 g for 2300 mm).

Q: What size and gearing options are available?

CAMM Slewing Ring Bearings are available in a smooth design or with internal or external toothing. Tooth modules of typical series are between m = 4 and 10. The technical tables contain all the important parameters - outside diameter (Da), bolt circles (na/ni), number of teeth and mass. This makes it easy to select the right bearing according to the load profile and drive concept.

Question 1

What is a Slewing Ring Bearings and how does it work?

Accepted Answer

A Slewing Ring Bearings(also known as a slewing bearing) connects two assemblies that rotate 360° in relation to each other. It transmits axial, radial and tilting moments in a compact installation space. The bearings consist of two concentric rings, between which rolling elements run in a single or double-row arrangement (e.g. four-point or double four-point contact). CAMM Slewing Ring Bearings are available in various designs - single-row (1R), double-row (2R) or reinforced (M/A1) - and optionally with internal, external or no toothing. The result is low-friction, precise rotation with a high load capacity under continuous load.

Question 2

Where are Slewing Ring Bearings used?

Accepted Answer

Slewing Ring Bearings serve as load-bearing rotary components in numerous industrial sectors: In construction machinery and crane systems for safe lifting and positioning, in robotics and automation for precise motion control, in wind power for azimuth and blade adjustment as well as in material handling and conveyor systems for precise motion sequences. Thanks to their robust design and exact running geometry, they are ideal for static and dynamic high-load applications.

Question 3

What types of Slewing Ring Bearings are there?

Accepted Answer

CAMM offers multi-row bearing designs with internal or external toothing, toothing-free designs as well as turntable and special variants. The series differ according to tooth module, load profile, installation space and rigidity requirements. Typical diameters range from Ø 100 mm to Ø 5000 mm, larger diameters on request. The choice of series depends on the axial and radial load, tilting moment and installation configuration. This results in a customized bearing solution for every application.

Question 4

Which operating and design parameters are relevant?

Accepted Answer

Slewing Ring Bearings are designed for operation between -20 °C and +60 °C, with a maximum rotational speed of approx. 1 rpm. The relubrication intervals depend heavily on the operating conditions:

300 operating hours in a protected indoor environment
100-200 operating hours for normal outdoor use
50 operating hours under dusty or damp conditions
Central lubrication is recommended for continuous operation. The quantity of grease depends on the running circle diameter (e.g. 20 g for 200 mm / 220 g for 2300 mm).

Question 5

What assembly and tolerance requirements apply?

Accepted Answer

Defined flatness and concentricity tolerances apply to the mounting surfaces of Slewing Ring Bearings. Depending on the size, the permissible flatness deviation is between 0.06 mm (Ø 200 mm) and 0.27 mm (Ø 2300 mm). The screw connection should be made with high-strength screws ≥ class 10.9, thread engagement ≥ 1.5×d and a three-stage cross-tightening sequence (30 / 80 / 100 %). Recommended guide values: M10 ≈ 72 Nm, M20 ≈ 600 Nm, locking elements in accordance with DIN 25201.

Question 6

How are Slewing Ring Bearings maintained?

Accepted Answer

The main task of maintenance is the regular lubrication of the raceways and gearing. Before lubrication, all lubrication points are cleaned, then grease is pressed in until fresh lubricant emerges from the sealing lips. In addition, screw connections should be checked after 200, 600, 2000 and 10,000 operating hours, seals inspected and maintenance documented. Recommended greases are temperature-resistant up to +230 °C and selected according to the applications.

Question 7

How is the load capacity of a Slewing Ring Bearings calculated?

Accepted Answer

The design is based on combined axial, radial and tilting loads as well as the gearing parameters for gear rims. Finite element analyses (FEA) are used to simulate contact zones, raceway pressure and structural rigidity. Tooth modulus and number of teeth define the force transmission; values such as Fz,nor and Fz,max are specified for each series. The stiffness of the mounting surfaces is also integrated into the load capacity assessment.

Question 8

What size and gearing options are available?

Accepted Answer

CAMM Slewing Ring Bearings are available in a smooth design or with internal or external toothing.
Tooth modules of typical series are between m = 4 and 10.

The technical tables contain all the important parameters - outside diameter (Da), bolt circles (na/ni), number of teeth and mass.

This makes it easy to select the right bearing according to the load profile and drive concept.

Question 9

What rules apply for handling, storage and installation?

Accepted Answer

Slewing Ring Bearings should be stored horizontally and remain in their original packaging until shortly before installation. During handling, the tooth flanks must be protected, suitable lifting equipment (≥ 1.5 × bearing mass) must be used and measuring equipment for evenness and concentricity must be kept ready. The seating surfaces must be cleaned before tightening; after assembly, a test run without load is recommended to ensure smooth movement.

Slewing Ring Bearings