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Calculation Examples of Four Lengthwise Vertical Dual-Axis Tables (BF Type) Use conditions and required service life BTF16 BTF20 BTF25 BTF30 BTF40 BTF50 Parts No. Load type Installation condition Allowable static load Allowable dynamic load Allowable static load Allowable dynamic load Allowable static load Allowable dynamic load Allowable static load Allowable dynamic load Allowable static load Allowable dynamic load Allowable static load Allowable dynamic load 4,410o@450p 1,470o@150p 6,180o@630p 2,060o@210p 8,830o@900p 2,940o@300p 13,200o 1,350p 4,410o@450p 21,200o 2,160p 7,060o@720p 26,500o 2,700p 8,830o@900p ‡@ Calculating loads applied to tables N=300,000 cycles a=0.1mm S=0.2m W=300kgf K=5~106 fc =0.85, single-axis, two units fw=1.0, no impact load fv =2.0, 25m/min {0.42m/s} fe=3.0, 30‹C or less, foreign matter f.=1.0, no lubrication L0=250mm L1=200mm L2=250mm L3=300mm A=B=C=D=W/2~L2/L0 E=F=G=H=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 = 300 kgf L0, L1, L2 and L3 = distance between load application point and each table L0 = 250mm, L1 = 200mm, L2 = 250mm, L3 = 300mm Find load applied to each table from above conditions. A = B = C = D = 300/2 ~ 250/250 = 150kgf E = F = G = H = 300/2 ~ 300/200 = 225kgf Select the shift table BTF30 so that the values of A, B, C, D, E, F, G, and H are within the ranges of values in the allowable load table shown in the description. Allowable load with simple load Load Calculation, Driving Force Calculation and Service Life Calculation (Unit: N {kgf}) 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. L0 L3 L2 L1 G C H D B A F E W 329Selection Guide Product Air Bearings Metallic Bearing Multi-layer Bearing Plastic Bearing Information Technical Corporate Profi le Information Slide Shifter