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MULTIPLE PRODUCTIONS
Your plant is producing three diferent products on the same production line
		Processing t		Lot size
Annual demand for A	2,000,000	45	seconds	2000
Annual demand for B	400,000	55	seconds	400
Annual demand for C	800,000	70	seconds	800
Change over times
From A to B	90	minutes
From A to C	40	minutes
From B to C	80	minutes
From B to A	90	minutes
From C to A	60	minutes
from C to B	50	minutes
Because of shipping requirement you ned to rotate the three productions
You are running 365 three shifts of 8 hours
You estimate that your capacity utilization will be 85%
A. what is the best rotation sequence					there are only two possible sequences
B. how many machines do you need
TO CALCULATE THE NUMBER OF MACHINES, YOU ADD THE TOTAL TIME TO PRODUCE A, B AND C PLUS THE TOTAL TIME TO CHANGE OVER FROM ONE PRODUCTION TO THE NEXT
AND YOU DIVIDE BY THE TOTAL TIME AVAILABLE * (1-C)
NUMERATOR	production time	changover time	subtotal
product A
product B
product C
		Total
DENOMINATOR	365 days
	ONE SHIFT 8 HOURS
	3600 seconds per hour
	capacity buffer 10%
C. how many machines would you need if you chose the OTHER sequence
NUMERATOR	production time	changover time	subtotal
product A
product B
product C
		Total

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