An operation is to be done in a single shift, 8 hours per day with 50 minutes per day downtime (operator allowance where the machine is also idle). The operation is expected to have an 85% performance and the following parts are to be run using this same machining process:

Part A, requirement is 10,000 per week, time standard = 0.3386 min/part

Part B, requirement is 15,000 per week, time standard = 0.2956 min/part

Part C, requirement is 20,000 per week, time standard = 0.2038 min/part

QUESTIONS TO ANSWER:

1. Assuming these are all the same type and model of machine, but dedicated to one part only. No setup. or change over is done, nor any time allowance needed. How many machines are needed if these three parts require this same process?

2. How many machines are needed if performance is expected to be only 75%?