A hoist rope drum with an effective diameter of 200mm is used with a single layer on the drum. The hoist is required to lift a load of 10,000 at a speed of 15 m/min. What is the required rpm of the drum. Please add a number only, if you think it is 2.54pm, then simply type 2.54 (answer to 2 d.p).
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- Two pulleys are run by a common belt. If a 10.8 inch diameter pulley turns at 900 rpm, what is the diameter of the second pulley if it turns at 421 R.P.M.? Note: Speed is inversely proportional to diameter.A shaft turning 200 RPM is to drive another shaft at 250 RPM connected in open belt. Find the diameters of the two pulleys, using integral number of inches for each diameter, to give as nearly as possible a belt speed of 3500 FPM.Homework Verify the value of the constant, 63 000 for the following equation in order to have the torque in lb.in units. T = 63000 P n ……………... (3-6)
- A shaft turning 150 RPM is to drive another shaft at 200 RPM. Find the diameters of the two pulleys, using integral number of inches for each diameter, to give as nearly as possible a belt speed of 2500 FPM. Please provide illustration.A pulley system is combined with an inclined plane. The pulley system has an IMA of 3, an efficiency of 96%, and 35 lbs of force was required by the user to pull the 215# box up the incline. What is the efficiency of the entire system?Find the standard distance between sprocket having 4 in and 16 in diameters.
- A lathe having a 5-step pulley is driven by a belt, assumed to be crossed, from a pulley of the same size on the countershaft. The countershaft is to have a constant speed, and the lathe is to have speeds of 60 rpm and 135 rpm when the belt is on the steps either side of the center step. If the minimum speed is 40 rpm and the smallest diameter is 4 in., find theproper speed of the countershaft, maximum speed of the lathe, and the diameter of all steps on the pulleys.Please solve this question in handwritting. Again in handwritingIS. 03 16. The shaft, as shown in Fig. 14.20, is driven by pulley B from an electric motor. Another belt drive from pulley A is running a compressor. The belt tensions for pulley A are 1500 N and 600 N. The ratio of belt tensions for pulley B is 3.5. B. TA2 A D. TA 150 -100- TB2 100 All dimensions in mm. Fig. 14.20 The diameter of pulley A is 150 mm and the diameter of pulley B is 480 mm. The allowable tensile stress for the shaft material is 170 MPa and the allowable shear stress is 85 MPa. Taking torsion and bending factors as 1.25 and 1.75 respectively, find the shaft diameter. Also find out the dimensions for a hollow shaft with outside diameter limited to 30 mm. Compare the weights of the two shafts. Ans. 30 mm : 24 mm: 1.82]
- The diagram below shows a shaft with spur gear (B), bevel gear(D), and two supporting bearings (A and C). All dimensions are in millimeters and all shoulder fillets (at points where diameter changes) have a radius of . The pressure angle for the spur gear at B is . The pressure angle for the bevel gear at D is and the bevel angle is . Note that the shaft is designed so that only bearing A takes thrust. The shaft is made of steel with . All the critical surfaces are ground. The shaft rotates at . A motor with a power of is connected at the bevel gear through another bevel gear. This drives the shaft. A load is connected through another spur gear at the output spur gear at B. The standard deviation on the power is . (a) Determine the forces acting on the gears. Recall that for a spur gear, the relation between the tangential component of the force and the radial component of the force and the pressure angle is given by . For this bevel gear, the axial (thrust) component of the force on…The essential features of a transmission dynamometer are shown in figure below (all dimension in mm). A is the driving pulley which runs at 600 RPM. B and C are jockey pulleys mounted on a horizontal beam pivoted at D, about which point the compete beam is balanced when at rest. E is the driven pulley and all portions of the belt between the pulleys are vertical. A, B and C are each 300 mm diameter and the thickness and weight of the belt are neglected. The length DF is 750 mm. Find: 1. The value of the weight W to maintain the beam in a horizontal position when 4.5 kW is being transmitted, and 2. The value of W, when the belt just begins to slip on pulley A. the coefficient of friction being 0.2 and maximum tension in the belt 1.5 kN. Driven 15 soojade Driving pulley 127,The essential features of a transmission dynamometer are shown in figure below (all dimension in mm). A is the driving pulley which runs at 600 RPM. B and C are jockey pulleys mounted on a horizontal beam pivoted at D, about which point the compete beam is balanced when at rest. E is the driven pulley and all portions of the belt between the pulleys are vertical. A, B and C are each 300 mm diameter and the thickness and weight of the belt are neglected. The length DF is 750 mm. Find: 1. The value of the weight W to maintain the beam in a horizontal position when 4.5 kW is being transmitted, and 2. The value of W, when the belt just begins to slip on pulley A. the coefficient of friction being 0.2 and maximum tension in the belt 1.5 kN. Driven pulley IT Driving pulley D B 27-30 300-300- 127, -750- W