Calculation example For bore size 63, when the unclamping angle is 90° and the load center of gravity position of the extension arm + clamping block is 250 mm. When the center of gravity position of the load mass of the extension arm + clamping block is 250 mm on the diagram at an unclamping angle of 90° in the size o63 graph, the total allowable load mass of the extension arm + clamping block is to 1.2 kg. o50 Diagram of unclamping angle 90° 400 380 360 340 320 300 280 260 240 220 200 180 160 140 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 10.5 11 11.5 12 12.5 13 13.5 o80 Distance to the load center of gravity L (mm) Allowable load mass W ( kg) 300 280 260 240 220 200 180 160 140 120 100 0 0.5 1 1.5 1.2Kg 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 o63 Distance to the load center of gravity L (mm) Allowable load mass W (kg) 30 45 60 75 90 105 120 135 250 mm 30 45 60 75 90 105 135 120 Distance to the load center of gravity L (mm) 250 200 150 100 50 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 Allowable load mass W (kg) 45 60 75 105 120 90 135 Allowable load mass CKZ2N-X2346 Allowable arm length/Allowable offset (mm) Bore size Allowable arm length 50 250 63 300 80 400 (mm) Bore size Allowable offset 50 50 63 50 80 55 Allowable arm length Offset Extension arm Clamp arm Allowable offset * The clamping force does not change within the allowable offset. θ W Fulcrum L Clamp arm Clamping block Shim Extension arm Load center of gravity Unclamping angle Fulcrum Extension arm Clamp arm Arm length Shim Clamping block The allowable load mass of the extension arm and clamping block to be mounted on the clamp arm may vary depending on the unclamping angle. Be sure to use the product within the allowable values in the graphs shown below. * The load indicates the total weight of the extension arm and clamping block. Calculation procedure of allowable load mass 1. Calculate the distance L from the fulcrum to the center of gravity of the extension arm + clamping block. 2. Check the unclamping angle of the product. 3. Obtain the allowable load mass from the graph, and use the product within the allowable range. 79