A centrifugal clutch has four shoes, each of mass 0·35 kg. When at rest, the radial clearance between the shoes and the clutch drum is 15 mm and the radius to the centre of gravity of the shoes is 225 mm. The shoes are held on retaining springs of stiffness 10 kN/m and the internal diameter of the clutch drum is 600 mm. The coefficient of friction between the drum and the shoes is 0·3. Determine: (a) The speed (in rev/min) at which the clutch starts to engage.  For a rotational speed of 1200 rev/min: (b) The force each shoe exerts on the drum.  (c) The torque transmitted.  (d) The power transmitted.

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Forming and Shaping

Metal forming is a category of metalworking process through which the material can be given the desired shape and size by subjecting it to plastic deformation, where the component undergoes bulk deformation process upon application of loads. Unlike the shearing and machining process, the material does not undergo up to a failure point as indicated in the stress-strain curve. Hence, the stresses induced during the forming process are greater than yield strength but less than the failure strength of the material. The process does not lead to the loss of material, so it can be said to be an economical process. During forming, the material is subjected to tensile forces, compressive forces, bending, and shearing loading conditions. The material should possess the property of ductility to undergo the forming process.