Question 3: Mechanisms The lengths of various links of a mechanism, as shown in Figure 2, are: OA = 0.3 m; AB = 1 m; CD = 0.8 m; and AC = CB. A upuu 45° Figure 2: Slider cranck mechanism 3.1. Draw the...

Extracted text: Question 3: Mechanisms The lengths of various links of a mechanism, as shown in Figure 2, are: OA = 0.3 m; AB = 1 m; CD = 0.8 m; and AC = CB. A upuu 45° Figure 2: Slider cranck mechanism 3.1. Draw the displacemt diagram to a scale. 3.2. Determine the velocity of piston B if the crank OA rotates at 160 r.p.m in the clockwise direction. 3.3. Calculate the velocity of point C.


Extracted text: Question 1: Gears The lath machine in the Central University of Technology (CUT) mechanical workshop uses epicyclic gear train shown in Figure 1 to operate. Plate gear C of this gear system are carried on the arm A and free to rotated. the pitch circle diameter of the internally toothed ring gear D is to be 214 mm and the module 4 mm. When the ring gear D is stationary, the arm A, which carries three planet wheels C of equal size, is to make one revolution in the same direction as the sun wheel B for every five revolutions of the driving spindle carrying the sunwheel B. Ring gear D Planet gear C Sun gear B Figure 1: An picyclic gear train of the lath machine Determine suitable number of teeth for all the wheels and the exact diameter of pitch circle of the ring. 1.1. Calculate the number of teeth of the ring gear D. 1.2. State an equation tha relate the number of teeth of gear D, B and C. 1.3. Use the table method to calculate the number of teeth of gear B. 1.4. Calculate the number of teeth for gear C. Question 2: Balansing A rotating shaft carries four masses A, B, C and D which are radially attached to it. The mass centres are 30 mm, 38 mm, 40 mm and 35 mm respectively from the axis of rotation. The masses A, C and D are 8 kg, 6 kg and 5 kg respectively. The axial distances between the planes of rotation of A and B is 400 mm and between B and C is 500 mm. The masses A and C are at right angles to each other and mass A is positioned at 0°. Show the position of the masses in shaft. 2.1. 2.2. Determane the angles between the masses B and D from mass A for a complete balance. 2.3. If the mass are balance calculate the axial distance between the planes of rotation of C and D. 2.3. Calculate the magnitude of mass B.