TOYCO produces toy shovels on a 20-ton press. The steps taken by the press operator to produce one shovel are: - remove finished shovel and put on conveyor 0.1 min - remove debris from the dies 0.2 min - spray dies with oil 0.1 min - checks raw material (flat sheet) for defects 0.3 min - places flat sheet into press 0.1 min - press cycles automatically for 1.0 min The operator is paid $10/hr and the press costs $100/hr to run. Raw material in shovel costs $1.00 and it sells for $4.00. What is the optimum number of presses for one operator for lowest unit cost?

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Analysis and Procedures for Material Selection

The term material selection means to select the right material for various engineering applications. There are various engineering materials available and each has different individual properties. Thorough knowledge of the material properties and behavior is crucial in the design process. For instance, a structural member, such as a beam, is used to support vertical shear loads by the building itself. To withstand such loads, the material of the beam must possess adequate strength and stiffness to resist any deformation that might lead to the formation of cracks.