Design a muff coupling to connect two shafts. The power to be transmitted is 27kW at a shaft speed of 440 rpm. The shaft and the key are made of same material and the allowable shear and the crushing stresses are 37 & 79 N/mm2 respectively. Calculate

(4) An electric motor purchased by your employer surprisingly arrived without a keyway in the shaft. The motor has power rating of 7.5kW & 1,800rpm & has a shaft of Ø17mm. It will be used to drive a centrifugal pump using cast iron sheave. Design the square key to be used in the assembly based on maximum bearing & shearing stresses of 580MPa & 370MPa, respectively, and factor of safety of 5.

A shaft/hub connection transmits a torque C =60N.m. We use a rectangular key (W=14mm x H=9mm) with a length of 30mm for a 45mm diameter shaft. Calculate the force exerted on the key.Calculate the compressive and shear stress.

A gear drive is required to transmit a maximum power of 22.5KW, the velocity ratio is 1:2 and the rpm of the pinion is 200 .the approximate center distance between the shaft may be taken as 600mm.the teeth has 20°stub involute profile.the static stress for the gear material ( which is cast iron ) may be taken as 60MPa and face width as 10 times the module.find the module, face width and number of teeth on each gear.Check the design for dynamic and wear loads. The deformation factor in the buckling equation may be taken as 80 and material combination factor for the wear as 1.4