Fourrow
linear recirculating ball bearing and guideway assemblies are available
in 
Table 1 Preload classes 



Influence of preload 
Increasing
the preload ╳ 
Table 2 Coefficient of friction 
The coefficient of friction
is dependent on the 

The spring curves show the deformation ╳ 
Figure 1 δ = deflection F = load 
Figure 2 δ = deflection F = load 
Figure 3 δ = deflection F = load 
Figure 4 δ = deflection F = load 
Figure 5 δ = deflection F = load 
Figure 6 δ = deflection F = load 
Figure 7 δ = deflection F = load 
Figure 8 δ = deflection F = load 
Figure 9 δ = deflection F = load 
Figure 10 δ = deflection F = load 
Figure 11 δ = deflection F = load 
Figure 12 δ = deflection F = load 
Figure 13 δ = deflection F = load 
Figure 14 δ = deflection F = load 
Figure 15 δ = deflection F = load 
Figure 16 δ = deflection F = load 
Figure 17 δ = deflection F = load 
Figure 18 δ = deflection F = load 
Unless
specified otherwise, the guideways have a symmetrical hole pattern, 
An
asymmetrical hole pattern may be available at customer request. In
this case, 
Figure 19 Symmetrical hole pattern Asymmetrical hole pattern 
The number of pitches between holes is the rounded whole number equivalent to: 
The 
For guideways with a symmetrical hole pattern: 
Number of holes: 

If the minimum values for a_{L} und a_{R} are not observed, the counterbores of the holes may be intersected. 
If
the guideway length required is greater than l_{max} according
to the dimension tables, these guideways are made up from
individual pieces that together comprise the total required length. The individual
pieces are matched to each other and marked, 
Figure 20 Guideway pieces: 1A, 1A 1B, 1B 1C, 1C 2A, 2A 2B, 2B 2C, 2C 
The
running accuracy ╳ 
The straightness of the system is only achieved when the guideway is pressed against the datum surface. 
If high demands are to be made on the running accuracy ╳ 
Geometrical and positional accuracy 
The higher the requirements for accuracy ╳ 
The tolerances according to 
Surfaces should be ground or precision milled – with the aim of achieving a 
Any deviations from the stated tolerances ╳ 
For ΔH, permissible values are in accordance with the following formula. If larger deviations are present, please contact us. 

Table 3 


Figure 21 (for all machined surfaces) 
Parallelism 
For guideways arranged in parallel, the 
Locating heights and corner radii 
The locating heights and corner radii should be designed in accordance with the table and 
Table 5 Locating heights, corner radii 

Figure 22 