A countershaft in a machine has two pulleys mounted on it for power transmission and is supported by cylindrical roller bearings at the ends. The countershaft runs at 1,500 revolutions per minute. The belt tension on the loose side of Pulley 1 is 15% of the tension on tight side. The pulleys are 50 mm wide. The bearings must have a minimum life of 90,000 hours. Design the shaft, mounting components and bearings. The design will include the following items. (1) Shaft material selection (2) Shaft diameters at critical locations along the shaft (using a factor of safety of 1.5) (3) Selection and design of the components needed for mounting the shaft and bearings (4) Selection and design of bearings (5) A CAD drawing of the shaft layout

When using the ohmmeter function of a digital multimeter, the leads are placed in what position relative to the component being tested? a. parallel b. control c. series d. line

What are the major differences between injection molding and extrusion?

Tom is having a problem with his washing machine. he notices that the machine vibrates violently at a frequency of 1500 rpm due to an unknown rotating unbalance. the machine is mounted on 4 springs each having a stiffness of 10 kn/m. tom wishes to add an undamped vibration absorber attached by a spring under the machine the machine working frequency ranges between 800 rpm to 2000 rpm and its total mass while loaded is assumed to be 80 kg a) what should be the mass of the absorber added to the machine so that the natural frequency falls outside the working range? b) after a first trial of an absorber using a mass of 35 kg, the amplitude of the oscillation was found to be 10 cm. what is the value of the rotating unbalance? c) using me-3.5 kg.m, find the optimal absorber (by minimizing its mass). what would be the amplitude of the oscillation of the absorber?