HEIJUNKA SCHEDULING OF CUSTOMERS' ORDERS The production manager at a factory manufacturing four types of light fittings (A, B, C and D) on an automated machine is fixing the schedule for the next week on this machine. The factory works six days a week and 15 hours a day after deducting time for breaks, during which production is halted. Details of producing the light fittings are given below. PRODUCT CODE CYCLE TIME SET-UP TIME (minutes) (minutes) A 8 20 NEXT WEEK'S DELIVERY PLAN 200 units B 11 12 75 units C 5 6 125 units D 20 15 50 units Required of you Part A If the production manager adopts heijunka (mixed-model) scheduling, what will the production schedule for the next week be? How much free time will be available after meeting the demand? Part B If the production manager wishes to meet this demand as quickly as possible, what will the production schedule for the next week be? How much free time will be available after meeting the demand? Part C If the demand for each of the four light fittings increases by 20% over the next week's demand as given in the table above, what will the heijunka schedule be? (New delivery plan for A = 240 units; B = 90 units; C = 150 units; 60 units)