(i) The diameters of pulleys; (ii) The length of the belt and (iii) Belt tensions on the tight and slack sides.
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- Q1/ A 6-in-wide polyamide F-1 flat belt is used to connect a 2-in-diameter pulley to drive a larger pulley with an angular velocity ratio of 0.5. The center-to-center distance is 9 ft. The angular speed of the small pulley is 1750 rev/min as it delivers 2 hp. The service is such that a service factor Ks of 1.25 is appropriate. (a) Find Fc, Fi, Fla, and F2. (b) Find Ha, nfs, and belt length. (c) Find the dip.A 6-in-wide polyamide F-1 flat belt is used to connect a 4-in-diameter pulley to drive a larger pulley with an angular velocity ratio of 3. The center-to-center distance is 8 ft. The angular speed of the small pulley is 1850 rev/min as it delivers 2 hp. The service is such that a service factor Ks of 1.25 is appropriate. (a) Find Fc, Fi, F1a, and F2. (b) Find Ha, nfs, and belt length. (c) Find the dip.A pulley system uses four v-section belts each with a cross-sectional area of 700mm 2, an included angle of 40°, and density 1400kg/m 3 The angle of lap is 130° on the smaller wheel, the coefficient of friction is 0.4 and the maximum force allowed in the belt is 500N. Calculate the initial belt tension and reason for this.
- A multiple V-belt drive is required to transmit 4 kW. The smaller pulley of the system is150 mm diameter, rotates at 200 rev/min, and has an angle of lap angle of 135°. Thegrove angle is 40° and the coefficient of friction between the belt and the pulleys is 0·3.If the maximum tension in any one belt is limited to 800 N, calculate:(a) The number of belts required. (b) The minimum tension in any one belt. (c) The required pre-tensioning of the belt. The centre-to-centre distance between the pulleys is 2 m.(d) Determine to the nearest mm, the required size for the larger pulley.(e) Find the approximate length of the beltAn overhang shaft carry a 900mm diameter pulley, whose center is 250mm from the center of nearest bearing. The weight of the pulley is 600N and the angle of lap is 180°.The pulley is driven by motor horizontally to right it, if the permissible tension in the belt is 2650N and the coefficient of friction between the belt and the pulley surface is 0.3, estimate the diameter of the shaft. Note, Neglect centrifugal tension and assume permissible tensile and shear stresses in the shaft as 84MPA and 68MPa respectively.2. A square threaded screw of mean diameter 25 mm and pitch of thread 6 mm is utilised to lift a weight of 10 kN by a horizontal force applied at the circumference of the screw. Find the magnitude of the [Ans. 966 N] force if the coefficient of friction between the nut and screw is 0.02. A bolt with a squore threaded screw has mean diameter of 25 mm and a nitch of 23 mm It carries an
- A multiple vee-belt drive is required to transmit 4 kW. The smaller pulley has of the systemhas a diameter 150 mm and rotates at 200 rev/min. The grove angle is 40° and thecoefficient of friction between the belt and pulley is 0·3.(a) If the maximum tension in any one belt is limited to 800 N and the angle of lap is135°, determine the number of belts required. (b) Determine also, the initial pre-tension required in the belt.A multiple disc clutch has radial width of the friction material as 1/5th of the maximum radius. The coefficient of friction is 0.25. Find the total number of discs required to transmit 60 kW at 3000 r.p.m. The maximum diameter of the clutch is 250 mm and the axial force is limited to 600 N. Also find the mean unit pressure on each contact surface.(b) The 60° V-belt of a machine is pass around the pulley A of a motor and over a pulley B as shown in Figure Q2 (b). The motor exerts a torque of 7 Nm to drive the system. The coefficient of static friction for both pulley is 0.35 and both pulleys has an equivalent diameter. Calculate the tension of T;and T, of V-belt just before it start rotating. M A B Øg= 120 mm Ø= 120 mm Figure Q2 (b)
- a Dashboard 曲 Events E My Courses This course TWo pulleys of radius 290 Tmm and 190 mm are mounted in an open-belt drive arrangement on two parallel shafts. The pulleys center lines are 0.58 m apart. of 15 stion The big pulley is rotating at 98 rpm and the coefficient of friction between the belt and the pulleys is 0.25 and the tensile force allowed in the belt is 1.2kN. Analyze the belt drive system and calculate: The contact angle at the big pulley: Opig ° (1) The contact angle at the small pulley: 0sm rad ° (2) STm The length of the belt, assuming a negligible thickness: т (3) The torque at the big pulley: Nm, and (1) The torque at the small pulley: Nm (1) The maximum power transmitted through the belt drive system kW (1) If the total mass of the belt is 2.3 kg, assuming a firm grip between pulleys and the belt and the same speed, all other relevant parameters remaining the same as in the statement above, you are required to revisit your analysis with respect to the centrifugal…HW5 The tension in a pulley belt is 30 N when stationary. Calculate the tension in each side and the power transmitted when the belt is on the point of slipping on the smaller wheel, the wheel is 300 mm diameter and the coefficient of friction is 0.4. The angle of lap is 160°. The wheel speed is 1420 rev/Min.(Q2) A pump is driven by an electric motor using an open type flat belt. Determine the width and length of belt for the following data: Power transmission = 15kW Rotational speed of the motor=1,440 rpm Motor pulley diameter = 250 mm Pump pulley diameter = 500 mm Coefficient of friction for motor pulley = 0.26 Coefficient of friction for pump pulley 0.22 Center distance between the pulleys = 1,200 mm Thickness of the belt = 5 mm Density of belt material = 1,000 kg/m? Allowable stress for the belt material = 2 MPa