Linear Line EN

Compact Rail

Preload

Preload classes The factory installed systems, consisting of rails and sliders, are available in two preload classes: Standard preload K1 means a rail-slider combination with minimum pre load which means the rollers are adjusted free of clearance for optimal running properties. Usually preload K2 is used for rail-slider systems for increasing the rigidity. When using a system with K2 preload a reduction of the loading capacities and service life must be taken into consideration (see tab. 20).

C R

Preload class

Reduction y

K1

-

K2

0.1

Tab. 20

This coefficient y is used in the calculation formula for checking the static load and lifetime (see pg. CR-95, fig. 172 and pg. CR 99, fig. 189). The interference is the difference between the contact lines of the rollers and the raceways of the rail.

Preload class

Interference* [mm]

Rail size

K1

0.01

all

0.03

18

0.04

28

K2

0.06

43

Tab. 21

* Measured on the largest interior dimension between the raceways

CR-29