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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, single-axis, 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/L0|W/2~L3/L1 B=W/4|W/2~L2/L0|W/2~L3/L1 C=W/4|W/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 L0AL1AL2AL3 = 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~200/200|100/2~200/200=25 B=100/4|100/2~200/200|100/2~200/200=|75 C=100/4|100/2~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 Dual-Axis Tables (S Type) STC20 STC28ESTF28 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 10,800o 1,100p 3,430o@350p 17,700o 1,800p 5,880o@600p 31,400o 3,200p 10,800o 1,100p 44,100o 4,500p 14,700o 1,500p 4,410o@450p 1,470o@150p 7,850o@800p 2,650o@270p 13,700o 1,400p 4,410o@450p 3,920o@400p 1,270o@130p 7,360o@750p 2,450o@250p 11,800o 1,200p 3,920o@400p .. .. 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 Multi-layer Bearing Plastic Bearing Information Technical Corporate Profi le Information Slide Shifter