Linear Line EN

Compact Rail

Parallel installation of two rails

If two T-rails or a T+U-system are installed, the height difference of the two rails must not exceed a certain value (obtainable from the table below) in order to ensure proper guiding. These maximum values result from the ma ximum allowable twisting angle of the rollers in the raceways (see tab. 78). These values account for a load capacity reduction of 30% on the T-rail and must absolutely be maintained in every case.

C R

α

b

a

b Fig. 163

α

α

Size

a

18

1 mrad (0.057°)

28

2.5 mrad (0.143°)

35

2.6 mrad (0.149°)

43

3 mrad (0.171°)

63

5 mrad (0.286°)

Tab. 78

Example: NSW43: if a = 500 mm; b= a*tan α = 1.5 mm

When using two T-rails, the maximum parallelism deviation must not be exceeded (see tab. 79). Otherwise stresses can occur, which can result in a reduction in load capacity and service life.

Rail size

K1

K2

18

0.03

0.02

28

0.04

0.03

35

0.04

0.03

43

0.05

0.04

63

0.06

0.05

Fig. 164

Tab. 79

Note: For parallelism problems, it is recommended to use a T+U or K+U system, since these combinations compensate for inaccuracies (see pg. CR-80 and following).

CR-95