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Bearings for main spindles
 

General features

 
 

Bearings for main spindles are available as:

 
 
  • super precision angular contact ball bearings ➤ Figure 1
    • single row, as single bearings or in sets
    • contact angle 15°, 25°
    • with large or small balls
    • rolling elements made from rolling bearing steel or ceramic
    • rings made from rolling bearing steel or Cronidur
    • Direct Lube bearings
  • super precision cylindrical roller bearings ➤ Figure 2
    • single row
    • double row
    • rolling elements made from rolling bearing steel or ceramic
    • cages made from brass, polyamide or PEEK
  • super precision axial bearings, i.e. super precision axial angular contact ball bearings 2344 ➤ Figure 3, super precision angular contact ball bearings BAX ➤ Figure 4
    • double direction
    • contact angle 30°, 40°, 60°
    • rolling elements made from rolling bearing steel
    • rings made from rolling bearing steel
    • cages made from brass, laminated fabric.
 
 

Super precision angular contact ball bearings

 
 

FAG super precision angular contact ball bearings are single row angular contact ball bearings with solid outer and inner rings, and ball and cage assemblies with solid window cages ➤ Figure 1. The dimensions are standardised.

 

Suitable for applications with very high guidance accuracy

 

Due to their very narrow tolerances, the bearings are particularly suitable for applications involving the highest requirements for guidance accuracy, rigidity and speed suitability, such as bearing arrangements for main spindles in machine tools.

 
imageref_18348417035_All.gif   The product range of super precision angular contact ball bearings is presented in the product tables ➤ dimension table. In addition to the products listed therein, further designs are available by agreement.  
   

Figure 1
Universal super precision angular contact ball bearings (universal spindle bearings)

α =  nominal contact angle
Fa =  axial load
Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Spindle bearing with balls made from rolling bearing steel
Symbole/00016411_mei_in_0k_0k.gif  Spindle bearing with balls made from ceramic
Symbole/00016412_mei_in_0k_0k.gif  Direct Lube spindle bearing

 

imageref_22776044939_All.gif

 

Extensive range for main spindle bearing arrangements, primarily in machine tools

 

This extensive product range gives the designer all possible scope for designing technically innovative, operationally secure and economical bearing arrangements. This results in significant performance improvements and cost savings as standard in machine tools. However, other machines, such as turbochargers for example, can benefit from these bearings.

 

Increased performance

 

In new designs, this can allow the machine manufacturer to achieve a unique position in the market. In existing designs too, refitting with FAG spindle bearings can still give further increases in the performance and profitability of machines.

 
 

Super precision cylindrical roller bearings

 

Features

 

FAG super precision cylindrical roller bearings comprise solid outer rings, solid inner rings with a tapered bore (taper 1:12) and cylindrical roller and cage assemblies with cages made from polyamide, brass or PEEK (polyetheretherketone) ➤ Figure 2. The outer ring is removable and can thus be mounted separately from the rest of the bearing package. The inner ring is only removable in the case of series NNU49.

 
imageref_18348417035_All.gif   FAG super precision cylindrical roller bearings are also available by agreement with a cylindrical bore.  
 

   

Figure 2
Super precision cylindrical roller bearings

Fr =  radial load
Symbole/00016410_mei_in_0k_0k.gif  Single row, tapered bore, N10
Symbole/00016411_mei_in_0k_0k.gif  Single row, tapered bore, ceramic rolling elements: HCN10
Symbole/00016412_mei_in_0k_0k.gif  Double row, tapered bore, NN30, NNU49

 

imageref_23333153547_All.gif

 

Areas of application

 

The single and double row bearings are used when the very highest pre­cision is required under very high radial load. Typical areas of application include machine tools and printing machinery. The bearings facilitate bearing arrangements with very high precision, high radial rigidity and very high load carrying capacity. In machine tool building, they provide radial support for the main spindle.

 

Ideal non-locating bearings

 

Since variations in length during rotary motion can be compensated between the rollers and the ribless raceway without constraining forces, the cylindrical roller bearings are highly suitable as non-locating bearings. Axial forces are supported by axial bearings, such as double direction axial angular contact ball bearings or super precision angular contact ball bearings BAX. The standard series N10, HCN10 (single row) and NN30, NNU49 (double row) are an established part of the FAG super precision range ➤ dimension table.

 
imageref_18348417035_All.gif   Diameter ranges not shown in the catalogue are available by agreement.  
 

X-life premium quality

imageref_19964530187_All.gif   The super precision cylindrical roller bearings N10 and NN30 in the X-life design have a higher load carrying capacity and thus a significantly increased bearing rating life. A newly developed plastic cage gives lower friction than the previous standard design with brass cage.  
 

The advantages of this bearing design include:

 
 
  • limiting speeds up to 35% higher
  • running temperatures up to 12 K lower
  • lower noise level
  • lower lubricant demand
  • longer grease operating life
  • higher basic load ratings
  • longer operating life of the bearings.
 
 

The basic dynamic load ratings C are up to approx. 20% higher than those of the previous bearing designs and the basic bearing rating life L10 is up to 65% longer than the previous standard. As a result of the increase in the basic bearing rating life L10, this gives a longer operating life of the bearings under the same operating conditions. If the rating life values are maintained, alternatively, higher loads can be applied to the bearing arrangement.

 
 

Super precision axial bearings

 
 

Super precision axial angular contact ball bearings 2344

Suitable for applications with very high precision and high axial loads

 

Double direction axial angular contact ball bearings of series 2344 in particular are very axially rigid super precision bearings preloaded clearance-free with restricted tolerances to class SP. The bearings are used when very high precision is required under high axial load.

 
   

Figure 3
Axial angular contact ball bearing 2344, double direction

α =  nominal contact angle
Fr =  radial load
Fa =  axial load

 

imageref_22526702731_All.gif

 

Features

 

These bearings without self-retention comprise solid shaft locating washers, a spacer ring, a housing locating washer and ball and cage assemblies with solid cages ➤ Figure 3. The bearing parts are matched to each other and can be fitted separately, but must not be interchanged with parts from other bearings. Available designs of series 2344➤ dimension table.

 

Contact angle

 

Due to the contact angle of 60°, they can support high axial loads from both sides.

 
 

Super precision angular contact ball bearings BAX

 

Increased load carrying capacity normally brings with it a reduction in the maximum speed. Through the use of angular contact ball bearings BAX, it is possible to unify both requirements. Angular contact ball bearings BAX:

 
 
  • can support high axial loads
  • have similarly high limiting speeds to X-life cylindrical roller bearings
  • have high rigidity
  • can support axial loads only.
 
 

The super precision angular contact ball bearings BAX conform to the accuracy class P4S and are generally supplied as ready-to-fit sets in the arrangement DB ➤ Figure 4. Available designs ➤ dimension table.

 
   

Figure 4
Angular contact ball bearing BAX, ready-to-fit set in O arrangement

α =  nominal contact angle
Fa =  axial load

 

imageref_22526706059_All.gif

 

Contact angle

 

Super precision angular contact ball bearings BAX are available with a contact angle of 30° for high speed requirements or, for even higher rigidities, also with a contact angle of 40°. As a bearing set, they can support high axial loads from both sides.

 
   
  
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