Röhm Main Catalogue Clamping Technology Page 724
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Determining the required gripping force of a power chuck Power-operated clamping devices The two components FsBo and Fvax give the resultant force FR FR = FSBo2 + Fvax2 The amount of the resultant force FR can be obtained directly from Table 7. Intermediate values will have to be determined by interpolation. Power-operated clamping devices Cutting force FsBo [kN] Resultant force FR KN Table 7 50 45 40 35 30 25 20 15 10 9,0 8,0 7,0 6,0 5,0 4,5 4,0 3,5 3,0 2,5 2,0 1,8 1,6 1,4 1,2 1,0 0,8 FSBo FR Fvax 6,9 6,1 5,7 5,3 4,9 4,6 4,3 4,0 5,8 2,0 1,8 1,7 1,6 1,4 2,3 2,1 2,0 1,8 1,7 1,6 2,6 2,4 2,3 2,1 2,0 1,9 1,8 1,2 1,4 1,6 3,1 2,7 2,5 2,4 2,3 2,2 2,1 2,0 3,2 2,8 2,7 2,6 2,4 2,3 2,2 2,2 1,8 2,0 4,3 3,9 3,5 3,2 3,1 3,0 2,9 2,8 2,5 5,4 5,0 4,6 4,2 3,9 3,6 3,5 3,4 3,0 3,5 8,1 7,2 6,4 6,0 5,7 5,3 5,0 4,7 4,0 10,3 9,4 8,6 7,8 7,0 6,7 6,4 6,1 5,8 8,3 7,5 6,7 6,4 6,0 5,7 5,4 5,1 4,5 5,0 16,2 11,7 10,8 10,0 9,2 8,5 7,8 7,5 7,2 6,0 16,6 11,2 11,4 10,6 9,9 9,2 7,0 17,0 12,8 12,0 11,3 10,6 10,0 8,0 9,0 21,9 17,5 13,5 12,7 12,0 32,3 26,9 27,7 22,4 23,3 18,0 19,2 14,1 15,6 13,5 12,8 37,7 33,1 28,7 24,4 20,5 17,2 43,1 38,5 34,0 29,7 25,6 21,9 48,5 43,9 39,4 35,0 30,8 26,9 53,9 49,2 44,7 40,3 36,1 32,0 28,3 10,0 12,0 14,0 16,0 18,0 20,0 25,0 Feeding force Fvax [kN] Place resultant force FR for drilling in solid material in the known formula for determining the required gripping force Fspz: Fspz = FR . Sz . μsp dz dsp where: Fspz = gripping force required for a given job with the chuck stationary. FR = resultant force of cutting force and feeding force Chucking ratio dz = dsp cutting dia. chucking dia where dz = drill dia. 2 μsp = chucking coefficient (friction between jaw and workiece) Sz = safety factor II and III Continue the calculation - from determination of the initial gripping force Fspo to determination of operating power and the pressure required - exactly as described in Section A) Turning, II) and III). 6210 www.eshop.roehm.biz 55,9 51,5 47,2 43,0 39,1 35,4 58,3 54,1 50,0 46,1 42,4 61,0 64,0 57,0 53,2 30,0 35,0 40,0
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