Question: An emergency situation has occurred in the milling department because the ship carrying a certain quantity of a required part front an overseas supplier sank on Friday evening. A certain number of machines in the department must therefore be dedicated to the production of this part during the next week. A total of 1000 of these parts must be produced, and the production cycle time per part = 16.0 min. Each milling machine used for this emergency production job must first he set up, which takes 5.0 hr. A scrap rate of 2% can be expected.
(a) If the production week consists of 10 shifts at 8.0 hr/shift, how many machines will he required?
(b) It so happens that only two milling machines can be spared for this emergency job, due to other priority jobs in the department.
To cope with the emergency situation, plant management has authorized a three-shift operation for 6 days next week. Can the 1000 re-placement parts be completed within these constraints?
A machine shop has dedicated one CNC machining center to the production of two parts (A and B) used in the final assembly of the company's main product. The machining center is equipped with an automatic pallet changer and a parts carousel that holds ten parts. One thousand units of the product are produced per year, and one of each part is used in the product. Part A has a machining cycle time of $0 min. Part B has a machining cycle time of 80 min. These cycle times include the operation of the automatic pallet changer. No other changeover time is lost between parts. The anticipated scrap rate is zero. The machining center is 95% reliable. The machine shop operates 250 day/yr. How many hours, on average, must the CNC machining center he operational each day to supply parts for the product?