318 TECHNICAL INFORMATION Q4MJEF 8BZT Rated load for slide ways is determined by the rolling elements(numbers of rollers). It can be calculated by using the following formulas: 3 1 Pm= (P13 ℓ1+P23 ℓ2…+Pn3 ℓn) ℓ t.FBO -PBE %FSJWFE GSPN 'MVDUVBUJOH -PBET In general, the load acting upon a linear system can change according to how the system is used.This happens for example when the reciprocating motion is started, stopped as compared to constant speed motion, and whether or not work is present during transfer, etc. Therefore, in order to correctly design the life span under various conditions and fluctuating loads, it is necessary to obtain a mean load and apply it to the life span calculations. (1) When load changes in steps by a travel distance(Fig-3) Travel distance ℓ1 subjected to load P1 Travel distance ℓ2 subjected to load P2 … … Travel distance ℓn subjected to load Pn Mean load Pm can be obtained by using the following formula: Fig-5(a) Pm≈0.65Pmax Fig-5(b) Pm≈0.75Pmax Pm: Mean Load Derived from Fluctuating Loads (N) ℓ : Total Travel Distance (m) (2) When load changes almost linearly (Fig-4) Mean load Pm can be approximated by the following formula: Pmin: Min. Fluctuating Load (N) Pmax: Max. Fluctuating Load (N) (3) When the load change resembles a sinusoidal curve as shown in Fig-5 (a), (b), Mean Load Pm can be approximated by the following formula: Q4MJEF (VJEFT Rated life span is the total travel distance each linear guide of the same series can endure under the same conditions, without the occurrence of flaking in 90% of the system. Rated life span can be obtained as follows from the basic dynamic load rating and the load to the slide guide. L: Rated Life Span (km) C : Basic dynamic load rating (N) fT: Temperature Coefficient (See Fig-2) P : Acting Load (N) fw: Load Coefficient (See Fig-4) The life span hours can be computed as a number of hours by obtaining the travel distance for a unit of time.It can be obtained by using the following formula, in which stroke length and stroke cycles are assumed to be constant. Lh: Life Span Hours (hr) ℓs : Stroke Length (m) L: Rated Life Span (km) n1 : Reciprocating Times per Minute (cpm) One shaft is used Load Direction Dynamic Load Rating (N) Static Load Rating (N) One shaft is used vertically Load Direction Dynamic Load Rating (N) Static Load Rating (N) Two shafts are used in parallel Load Direction Dynamic Load Rating (N) Static Load Rating (N) C1: Basic Dynamic Load Rating per Roller (N) CO1: Basic Static Load Rating per Roller (N) Z: Number of Rolling Elements The life span for slide ways is calculated by using the following formula. L: Life Span Hours(km) C: Dynamic Load Rating (N) fT: Temperature Coefficient (See Fig-2) P: Acting Load (N) fw: Load Coefficient (See Fig-4) Lh: Life Span Hours (hr) ℓs: Stroke Length (m) L: Life Span Hours (km) n1: Reciprocating Times per Minute (cpm) Life Span Hours L·103 Lh= 2·ℓs·n1·60 fT·C 10/3 L= ·50 fw·P ( ) L·103 Lh= (2) 2·ℓs·n1·60 fT C 3 L= · ·50 (1) fw P ( ) Z CO= ·CO1·2 2 ( ) Z 3/4 C= ·C1·27/9 2 ( ) Z CO= ·CO1·2 2 ( ) Z 3/4 C= ·C1·27/9 2 ( ) Z CO= ·CO1 2 ( ) Z 3/4 C= ·C1 2 ( ) 1 Pm≈ (Pmin+2·Pmax) 3
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