Use the velocity triangle method to determine the velocity o

Use the velocity triangle method to determine the velocity of the point E (follower) at this time instant marked with the current position and configuration. Note that all lengths depicted as a. b. c, d. c, and f along with x

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.