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Load Calculation, Driving Force Calculation and Service Life Calculation Use conditions and required service life ‡@ Calculating loads applied to tables N=1 million cycles a=0.1mm S=0.25m W=100kgf K=5~106 L0=L1=L2=L3=200mm fc =0.75, singleaxis, two units fw=1.0, no impact load fv =1.0, 0.05m/s fe=1.0, 60.C or less, no foreign matter f.=1.0, no lubrication A=W/4{W/2~L2/L0W/2~L3/L1 B=W/4W/2~L2/L0W/2~L3/L1 C=W/4W/2~L2/L0{W/2~L3/L1 D=W/4{W/2~L2/L0{W/2~L3/L1 Use the load calculating formula shown above and find the load to be applied to each table from the use conditions. W = load = 100 kgf L0AL1AL2AL3 = distance between load application point and each table Find A, B, C and D (load to be applied to each table) from L0 = L1 = L2 = L3 = 200 mm. A=100/4{100/2~200/200100/2~200/200=25 B=100/4100/2~200/200100/2~200/200=75 C=100/4100/2~200/200{100/2~200/200=25 D=100/4{100/2~200/200{100/2~200/200=125 Select the proper shift tables so that the values of A, B, C and D are within the ranges of values in the allowable load table shown in the description. A = 25 kg (erecting) B = 75 kg (hanging) ¦See the hanging values for negative values. C = 25 kg (erecting) D = 125 kg (erecting) As a result, the STF28 is selected from the allowable load table. Calculation Examples of Four Erecting DualAxis Tables (S Type) STC20 STC28ESTF28 STF38 STF48 Allowable static load Allowable dynamic load Allowable static load Allowable dynamic load Allowable static load Allowable dynamic load Allowable static load Allowable dynamic load 10,800o 1,100p 3,430o@350p 17,700o 1,800p 5,880o@600p 31,400o 3,200p 10,800o 1,100p 44,100o 4,500p 14,700o 1,500p 4,410o@450p 1,470o@150p 7,850o@800p 2,650o@270p 13,700o 1,400p 4,410o@450p 3,920o@400p 1,270o@130p 7,360o@750p 2,450o@250p 11,800o 1,200p 3,920o@400p .. .. Erecting Lateral Hanging Load type Installation condition œAllowable static load: Allowable load when it is born in the stationary condition or at quite low speed near stopping (not more than 0.0017 m/s [0.1 m/min.]) œAllowable dynamic load: Allowable load in the condition with sliding speed of 1.0 m/s [60 m/min] or less. œDo not use the STC20 in the lateral or hanging condition. Allowable load with simple load Parts No. (Unit: N {kgf}) L1 L0 L3 L2 A B D C W 327Selection Guide Product Air Bearings Metallic Bearing Multilayer Bearing Plastic Bearing Information Technical Corporate Profi le Information Slide Shifter 