Page 62 - RoboCilindri, RCP2-RCP3, robocilindri, sinta,

Allowable Dynamic Moment and Allowable Static MomentThere are two types of moment that can be applied to the the guide: the allowable dynamic moment and the allowable static moment.The allowable dynamic moment is calculated from the travel life (when flaking occurs) when moved with the moment load applied. In contrast, the static moment is calculated from the load that causes permanent deformation to the steel ball or its rolling surface (i.e. rated static moment), taking into account the rigidity and deformity of the base.[Allowable Dynamic Moment]IAI's catalog contains the allowable dynamic moments based on a load coefficient of 1.2 and 10000km or 5000km. This value is different from the so-called basic rated dynamic moment, which is based on a 50km travel life.To calculate the basic rated dynamic moment for a 50km travel life, use the following equation. The allowable dynamic moments mentioned in the catalog (10000km or 5000km life) are based on a load coefficient fw=1.2. To calculate the service life of a guide with a different load coefficient, use Table 1 below to determine the load coefficient that matches your requirements.Table 1: Load CoefficientsCIA 1.2 3L10=( P fw ) xS Equation (2)[Allowable Static Moment]The maximum moment that can be applied to a slider at rest.These values are calculated by taking the basic rated static moment of the slider and multiplying with the safety rate that takes into consideration any effects from the rigidity and deformity of the base.Therefore, if a moment load is applied to the slider at rest, keep the moment within this allowable static moment. However, use caution to avoid adding any unexpected shock load from any inertia that reacts on the load.[Basic Rated Static Moment]The basic rated static moment is the moment value at which the sum of the permanent deformation at the center of contact between the rolling body (steel ball) and the rolling surface (rail) is 0.0001 times the diameter of the rolling body.These values are simply calculated strictly from the permanent deformation done to the steel ball and its rolling surface. However, the actual moment value is restricted by the rigidity and deformation of the base. Hence, the allowable static moment the actual moment that can be applied statically, taking into account those factors.Technical ReferenceM50=fw×MS÷(S )1 50 3: Allowable dynamic moment at an assumed travel distance (catalog value) : IAI catalog assumed travel life (5000km or 10000km): Load coefficient (=1.2): Basic rated dynamic moment (50km travel life)Operation and Load RequirementsLoad Coefficient fwSlow operation with light vibration/shock (1500mm/s or less, 0.3G or less)1.0~ 1.5Moderate vibration/shock, abrupt braking and accelerating (2500mm/s or less, 1.0G or less)1.5~ 2.0Operation with abrupt acceleration/deceleration with heavy vibration/shock (2500mm/s or faster, 1.0G or faster)2.0~ 3.5L10 : Service life (90% Survival Probability)CIA : Allowable dynamic moment in IAI Catalog (5000km or 10000km) P : Moment used (≤ CIA)S : IAI catalog assumed travel life (5000km or 10000km)fw : Load coefficient (from Table 1)Technical Reference/Information Appendix: - 6