The achievable speeds are dependent on the overall energy balance in the system.
The decisive factors are:
- the number of bearings
- the arrangement of the bearings
- the internal load (preload class)
- the external load
- the lubrication
- the heat dissipation.
FAG spindle bearings
The limiting speeds in the dimension tables are based on elastically preloaded single bearings and are guide values that may deviate up or down depending on the operating conditions. However, they give an indication of the speed capacity under relatively low load and when using elastically preloaded single bearings with good heat dissipation.
The data for grease lubrication are valid when using the high speed grease in the correct quantity.
Reduction factors
The speed limits stated are reduced in the case of bearings fitted with rigid preload or high preload (in order to achieve better rigidity of the spindle) as well as in bearing pairs and bearing groups. The speeds in the dimension tables must therefore be multiplied by reduction factors. The factors fr to be used here are shown in the table.
Speed reduction for FAG spindle bearing sets
FAG super precision cylindrical roller bearings
The limiting speeds nG given in the dimension tables are valid for grease lubrication or minimal quantity oil lubrication and must not be exceeded.
In the case of cylindrical roller bearings, the radial internal clearance after mounting must be selected in accordance with the maximum operating speed. Guide values are shown in the table. Speeds nG grease and nG oil, see dimension tables.
Achievable speeds
dM = (d + D)/2
Axial angular contact ball bearings
Double direction axial angular contact ball bearings are suitable for moderate speeds.
For higher speeds, single row angular contact ball bearings of the design BAX with a contact angle of 30° or optionally 40°, Axial Bearings BAX. These bearings are fitted in pairs and subjected to axial load only.
The speeds given in the dimension tables are valid for bearing pairs with light preload. The speed reduction factor for the preload M is 0,80.
Comparison of speed suitability
1, Speed parameter
2, Grease lubrication
3, Minimal quantity oil lubrication
