Problem 3-9

# Problem 3-9 - MACHINE DESIGN An 3-9-1 PROBLEM 3-9 A...

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MACHINE DESIGN - An 3-9-1 PROBLEM 3-9 Statement: A ViseGrip plier-wrench is drawn to scale in Figure P3-3. Scale the drawing for dimensions. Find the forces acting on each pin and member of the assembly for an assumed clamping force of P = 4000 N in the position shown. What force F is required to keep it in the clamped position shown? Units: N newton kN 10 3 N . Given: Clamping force P 4.00 kN . Dimensions a 50.0 mm . e 28.0 mm . α 21.0 deg . b 55.0 mm . f 26.9 mm . β 129.2 deg . c 39.5 mm . g 2.8 mm . d 22.0 mm . h 21.2 mm . Assumptions: 1. Links 3 and 4 are in a toggle position, i.e., the pin that joins links 3 and 4 is in line with the pins that join 1 with 4 and 2 with 3. Solution: See Figure 3-9 and Mathcad file P0309. 1. The FBDs of the assembly and each individual link are shown in Figure 3-9. The dimensions, as scaled from Figure P3-3 in the text, are given above and are shown on the link FBDs. 50.0 = a 22.0 = d 21.0° = α 21.2 = h F 26.9 = f 32 2.8 = g 129.2° = β 28.0 = e 2 F 12 P 14 F 4 21.0° = α 34 F F 4 2 1 P P F 55.0 = b 21.0° = α F 39.5 = c 21.0° = α 3 F 41 43 F 23 F 129.2° F 21 1 F 3 P FIGURE 3-9

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Problem 3-9 - MACHINE DESIGN An 3-9-1 PROBLEM 3-9 A...

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