system, the driver gear ear's axle by a certain small motor. Hand drills pm) are the number ocity ratio (VR) is abling гор task 2 Calculate mechanical advantage for gears using ratios n your own. rook at the gear train in Figure 15. Driver gear Teeth = 25 90 rpm ar the driver, the has 40 what is 04 cm 012 cm Driven gear Teeth = 75 2. d) b) a) Figure 15 Determine how many times the driven gear will rotate for every full rotation of the driver gear. Use the gear wheel diameter formula. Use the tooth ratio formula to calculate the gear ratio of the gear train. (3) Calculate the output speed of the driven gear. Look at the gear train in Figure 16. Calculate the velocity ratio of the driven gear. Calculate the velocity ratio in revolutions per minute at gear C. Driver gear Teeth = 15 Idler gear Teeth = 45 (4) (3) (3) (8) Figure 16 A B Driven gear Teeth = 5

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Q12. The simple connecting rod mechanism shown in Figure Q12 has a connecting rod length AB of 142mm and a crank radius OA of 46mm. The connecting rod has a centre of gravity C, which is located 32mm from end A. a) b) c) d) e) When the crank angle 0 is 305° and the crankshaft speed (w) is 6500rpm clockwise as shown, determine by kinematic analysis: The magnitude and direction of the angular velocity of the connecting rod. The magnitude and direction of the velocity of the piston. The magnitude and direction of the angular acceleration of the connecting rod. The magnitude and direction of the acceleration of the piston. The magnitude of the acceleration of the centre of gravity (C) in the X and Y directions. Bo a Fig. 12 Connecting Rod Mechanism A Ꮎ a) b) c) d) e) 131.2 rad/s (ACW) 30.6 m/s to the left 122782.7 rad/s² (ACW) 9953.8 m/s² to the right x: 11712.9 m/s² to the right y: 13524.2 m/s² upwards 4