Lineární vedení Schneeberger MINIRAIL - EN

86 17 Load Carrying Capacity and Service Life 17.2 Calculation of Service Life L in Accordance with the DIN ISO Standard 17.2.1 The Formula for Calculating the Nominal Service Life for Ball Guide- ways in Meters is as follows: L = a ∙ � C eff � 3 ∙ 10 5 m P a C eff P L = Event probability factor = Effective load carrying capacity N = Dynamic, equivalent load in N = Nominal service life in m Event probability factor a The load carrying capacities for roller-contact bearings correspond to the DIN ISO standard. This represents a value from the service life calculation, which has a 90% chance of being exceeded during operational use of the guideway. If the previously mentioned theoretical service life probability factor of 90% is not sufficient, the service life values will need to be adjusted by a factor a. Event probability in % 90 95 96 97 98 99 Factor a 1 0.62 0.53 0.44 0.33 0.21 17.2.2 The Formula for Calculating Nominal Service Life in Hours is as follows: L h = L = L 2 ∙ s ∙ n ∙ 60 60 ∙ v m L L h s n v m = Nominal service life in m = Nominal service life in h = Stroke length in m = Stroke frequency in min -1 = Medium travelling speed in m/min 17.2.3 Effective Load Carrying Capacity C eff Constructive and external influences can reduce the dynamic load capacity C of MINI-X products in such a way that C eff must be calculated. C eff = f K · C C eff f K C = Effective load carrying capacity N = Contact factor = Maximum permissible dynamic load carrying capacity in N