Linear Line EN

5 Technical instructions

External preload The unique design of the Compact Rail product family enables applying a partial external preload on selected locations along the entire guide. An external preload can be applied by pressure along the side surfaces of the guide rail according to the drawing below (see fig. 143). This local preload results in higher rigidity only at the locations where it is necessary (e.g. on reversing points with high dynamic auxiliary forces). This partial preload increases the service life of the linear guide by

avoiding a continually increased preload over the entire length of the guide. Also the required drive force of the linear carriage in the non-pre loaded areas is reduced. The amount of the externally applied preload is determined using two dial indicators by measuring the deformation of the rail sides. These are de formed by thrust blocks with pressure screws. The external preload must be applied when the slider is not directly located in the pressure zone.

Size

A [mm]

18

40

28

55

35

75

43

80

63

120

Tab. 67

Dial indicator for determining the side deformation

A minimum

Thrust block

Pressure screws

Fig. 143

The graph below indicates the value of the equivalent load as a function of the total deformation of both rail sides. The data relates to sliders with three rollers (see fig. 144).

]

0rad

Equivalent load [%C

δ [ μ m]

Fig. 144

CR-86