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Assembly of ball turntable bearings

Turntable bearings must be fixed to the structure by using bolts.
For correct fixing of the turntable bearing, it is important that the supporting surfaces be as flat and rigid as possible. It should be ensured that the turntable bearing rests on the connecting structure with at least 50% of its surface and that the supporting areas are distributed symmetrically in regard to the direction of movement.
Holes in line with the ball loading plug are not permitted; this plug may be recognised by the soldering on the raceway of the external ring.
The plug should be placed between 45° and 90° with regard to the direction of movement.
To fix the turntable bearing, at least 8.8 quality bolts must be used. The size of the bolts and the recommended tightening torque values are indicated in the table.
The insertion of suitable squares (at least 4 per side), soldered to the supporting structure, allows the bolts to discharge the radial thrust that occurs due to acceleration and deceleration.
The ball turntable bearing must not be fixed to the structure by soldering.
It is advisable to carry out a second greasing before assembly.

 

Type of turntable bearing
Minimum no. of bolts
Bolts
Type
Quality
Nut
L-300-400-500-600
4
M12
8.8 min.
Hexagonal or self-blocking
N-600-650-700-750
6
M12-M14
N-800-850-900-950
N-1000-1050
6
M14-M16
P-900-1000-1100
T-1000-1100
8

Level of resistance according to DIN/ISO 898
8.8
Limit tensile strength Rp0,2 in N/mm˛
640

Metric thread according to
Resisting section
Core section
Tensioning force
Assembly and tightening torque
DIN/ISO 13
As
A3
FN

M's

 
mm²
mm²
M
Nm
Kgm
M12
84.3
76.2
38500
78
8
M14
115
105
53000
126
13
M16
157
144
72000
193
20

 
 
 
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