Complete problem the problem below Observe the following It

Complete problem the problem below. Observe the following: It is required to show the V-M diagrams for this beam. Clearly indicate |M|_max. \"Economical\" means to select the lightest acceptable beam for this application. Assume that the beams are to be prismatic (the cross-sectional shape will be constant from end to end) for manufacturing simplicity. Select your beams from Appendix C, using \"W\" (\"Wide-flange\" shapes) from the U.S. Customary units page only. Note the footnote in Appendix C that shows how the weight of the beam is encoded in the designation. compute the minimum required section modulus, then scan the table in Appendix C to find the lightest beam that meets or exceeds that requirement.

Solution

Changeover of fixtures on a machine takes 35 minutes. Following changeover an average of 5 parts must be produced and discarded before correct sitting is achieved. The machine cycle time for each part is 2 minutes and the materials cost is $1.50. The labour cost for a skilled set up person is $45 per hour while the machine operator is paid $30 per hour. Current batch size is 50. Suppose the set up time can be reduced so that the operator can perform the changeover and on average only two parts are required before correct setting is achieved, what should be the new set up time so that a batch size of 20 could be produced with only 90% of the current cost per unit? The cost per unit is the total of material cost, labour of set up and labour cost of running the machine.