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Unformatted text preview: 3. By virtue of 1 and 2 above, this is a planar problem that can be described in a 2D FBD. Solution: See Figure 3-21 and Mathcad file P0321. F F T 12" = dAB (a) Single-ended Wrench F F T 12" = dAB 6" (b) Double-ended Wrench 1. Summing moments about the left end of the wrench (for either case) T F d AB . 2. Solving for F F T d AB F 70 lbf = 3. This result is the same for both wrenches. Is there any difference between the way these two wrenches perform their assigned task? No, they both require the same two-handed exertion of 70 lb from each hand. Is one design better than the other? If so, why? Explain. FIGURE 3-21 Design (b) has advantages over (a) because it is balanced about the wheel nut. This allows the user to spin the wrench once the nut is loosened. It is also slightly easier to apply the upward and downward forces (F) in a plane with design (b). Free Body Diagrams for Problem 3-21 P 0321.mcd...
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This note was uploaded on 04/26/2010 for the course MAE 3242 taught by Professor N/a during the Spring '10 term at University of Texas-Tyler.
- Spring '10
- Machine Design