When in use, the motor and flywheel of a punch press run continuously. A compressed-air-actuated, multiple-disk clutch connects the flywheel to the countershaft each time the press is to punch or form metal. The clutch torque required is 600 N m. Alternate sintered metal and cast-iron disks are to be used. For design purposes it is decided to use 75 percent of the average value of f, and one-third of the average value of p given in Table 18.1. In addition, a safety factor of 1.20 is to be used with respect to torque capacity. Space requirements limit the disk outside diameter to 250 mm. (a) Determine the minimum satisfactory total number of disks. (b) Using this number of disks, determine the minimum area of com- pressed-air actuating surface that must be provided if air will always be available at a pressure of at least 0.40 MPa. Ans. Part a.) (2 Sintered Metal Friction disks and 3 Cast Iron Plates) Note: The number of friction surface interfaces: N = 4. Part b.) Area = 0.02029 m²

When in use, the motor and flywheel of a punch press run continuously. A compressed-air-actuated, multiple-disk clutch connects the flywheel to the countershaft each time the press is to punch or form metal. The clutch torque required is 600 N m. Alternate sintered metal and cast-iron disks are to be used. For design purposes it is decided to use 75 percent of the average value of f, and one-third of the average value of p given in Table 18.1. In addition, a safety factor of 1.20 is to be used with respect to torque capacity. Space requirements limit the disk outside diameter to 250 mm. (a) Determine the minimum satisfactory total number of disks. (b) Using this number of disks, determine the minimum area of com- pressed-air actuating surface that must be provided if air will always be available at a pressure of at least 0.40 MPa. Ans. Part a.) (2 Sintered Metal Friction disks and 3 Cast Iron Plates) Note: The number of friction surface interfaces: N = 4. Part b.) Area = 0.02029 m²

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Only ítem B) a) select the diameter of the cylinder to be used from L=150mm, if it is required to apply a force of 350 kg for a pneumatic die-cutting press. use the SMC analytical mathematical calculation method, clearly indicating the considerations and criteria used in the calculation. P=80psi b) The press will be activated 6 times per minute, neglecting the consumption of the hoses, determine the air consumption per minute required by the system. c)Make the pneumatic diagram for the operation of said press, the application will be with pneumatics pure and as it has no guard it is required that the press be activated using 2 hands safely Explain how it works and describe its components.
A multiple friction clutch is required to transmit 89.52 kW at 3000 rpm. The plates are alternatively of steel and phosphor bronze and they run in oil. The coefficient of friction is 0.08. The internal radius of the friction surface is 0.8 times the radius of the external surface. The axial pressure is limited to 20 x 104 N/m2. If the maximum diameter of the frictional surface is not to exceed 250 mm, determine the number of plates required.
A multi plate clutch has three plates and four pressure plates, pressed together by an axial force of 500N. µ = 0.3. The outer radius of the plates is 100mm, and the inner radius is 80mm. Calculate the torque that the clutch can transmit. If the inner radius and axial force are to remain the same, but the torque is increased by 25%, what must the outer radius than
A wet disk clutch is to be designed to transmit 150 Nm of torque at 1200 rpm using 4 pairsof sintered lining with a maximum pressure at 1.8 N/mm² and the coefficient of friction as0.06. Assume uniform wear, compute the following:i.The required inner and outer diameters of the sintered lining if the internal diametershould be 0.577 of the external diameter.ii.The number of disks needed.iii.The power transmitting capacity.iv.The axial force exerted by the springs to keep the clutch engaged.
...A plate clutch with single driving plate with contact surfaces on each is required to transmit 35 kW at 2400 rpm. Given that μ = 0.29, R = 1.25r, Pmax = 0.2 MPa, determine the inside radius of the frictional surface in mm. Assume the uniform wear conditions.
a single-start, square-threaded power screw with the following parameters: PARTS A - D circle final answers for each part A - A weight of 1500 N must be lifted. What is the total required torque necessary to lift this weight? Give your answer in units of N m. Part B - if the available power to drive the screw is 1,011 Watts, determine the fastest speed at which the weight can rise. Give your answer in units of mm/s, Part C - The efficiency of the preceding power screw (expressed as a number between 0 and 1, not as a percentage) is ? Part D - Suppose a high-quality thrust bearing was used to eliminate the collar friction. The efficiency of the screw would now be?
Solve the problem, show your complete solution. Answer must be in 3 decimal places. 1. A multiple-disk clutch transmits 25 kW at 600 rpm. It has 17 disks, 8 disks mounted on one shaft and 9 on the other shaft. The disks are 150 mm outside diameter and 70 mm inside diameters, respectively. If the coefficient of friction is 0.25, find the axial force required to engage the clutch and transmit the torque.
A single plate friction clutch with both sides of plate being effective is used to transmit power at an engine speed of 200rpm. It has outer and inner radii 10cm and 8cm respectively. Find maximum power transmitted and the corresponding axial thrust, if the maximum intensity of pressure is not to exceed 0.08N/mm2 . Assume coefficient of friction as 0.25.
The factor of safety against slipping in the friction clutch = 1.3; coefficient of friction=0.3; working speed= 600 rpm; friction surface number= 2; If required clamping force = 2917 N, clutch outer diameter = 400 mm, clutch inner diameter = 160 mm, what is the transmitted power?
In rolling contact bearings, the skidding of balls can be reduced by ............. of bearings
3) A multiple disc clutch, steel on bronze, is to transmit 7 kW at 1000 rpm. The inner radius of thecontact is 50 mm and outer radius of the contact is 75 mm. The clutch operates in oil with an expected coefficient of "0.1". The average allowable pressure is 0.35 N/mm2. Determine the total number of steel and bronze discs.
The external and internal diameter of a single plate clutch are 125 mm and 100 mm, respectively. It is used to transmit power at limited (maximum) axial pressure of 0.2 MPa. Which of the following is the axial force exerted by the springs? Assume uniform wear conditions. Choices: 790N1960N 440N 980N