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- The following data were obtained in a study taken on a horizontal milling machine:Parts produced per cycle: 8.Average measured cycle time: 8.36 minutes.Average measured stress time per cycle: 4.62 minutes.Average fast traverse time: 0.08 minutes.Average cutting time with electrical power: 3.66 minutes.Performance rating: 115%.Clearance (machine time): 10%.Slack (effort time): 15%.The operator works on the task 8 hours a day and produces 380 parts. How many standard hours does the operator work? What is the operator's efficiency for the 8-hour day?The following data were obtained in a study taken on a horizontal milling machine:Parts produced per cycle: 8.Average measured cycle time: 8.36 minutes. Average measured stress time per cycle: 4.62 minutes. Average fast traverse time: 0.08 minutes. Average cutting time with electrical power: 3.66 minutes. Performance rating: 115%. Clearance (machine time): 10%. Slack (effort time): 15%. The operator works on the task 8 hours a day and produces 380 parts. How many standard hours does the operator work? What is the operator's efficiency for the 8-hour day?A HSS tool is used to turn a steel workpart that is 300 mm long and 80 mm in diameter. The parameters in the Taylor equation are: n = 0.13 and C = 75 (m/min) for a feed of 0.4 mm/rev. The operator and machine tool rate = $30.00/hr, and the tooling cost per cutting edge = $4.00. It takes 2.0 min to load and unload the workpart and 3.50 min to change tools. Determine: Tutting speed for maximum production rate, Tool life in min of cutting, and Cycle time and cost per unit of product. determine cutting speed for minimum cost.
- Assume that you have a machine shop consisting of a high-speed, strip-fed punch press producing the final product. The equipment only takes 25% of the production hall of your machine shop and has a generated noise level of 102 dBA when operating at an average of 280 strokes per minute. This equipment should work 16 hours per day. Following the provided information does the equipment noise level permissible for the device operator(s) working 6-8 hours daily in the production hall? If not, what possible solutions do you suggest to reduce the noise level of the device and make it possible to run the equipment for 16hours/day continuously? Note that the only modification to the equipment itself is applying a specific type of anti-vibration damping sheets which can lower the noise level maximum 7 dB.An emergency situation has arisen in the milling department, because the ship carrying a certain quantity of a required part from 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 rush job must first be set up, which takes 5.0 hr. A scrap rate of 2% can be expected. Assume availability = 100%. (a)If the production week consists of 10 shifts at 8.0 hr/shift, how many machines will be 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 six days next week. Can the 1000 replacement parts be completed within these constraints?In a casting machining company, it takes an operator 30 seconds to load ,15 seconds to unload each machining center. There are several same centers, all working on the same type of part, and the duration of the automatic operation is 1 minute. The travel time between machines is 15 seconds. Given that the cost per hour of the operator $8 and the cost per hour of the machine is $10, using the man-machine diagram, determine the value of the highest production rate for the system
- Consider a line consisting of only one machine. This machine takes on average 4 minutes (te=4 min) to complete a job and Ca2=Ce2=1. The arrival rate of the parts to this machine is 1/8 part/minutes. Assume that there is enough space for only 5 parts between the machines (Hint: the buffer size, b, is 5.) Compute the expected CT of this production line. CT=_________A single model manual assembly line produces a product whose work content time = 48.9 min. The line has 24 workstations with a manning level M = 1.25. The product has a Available shift time per day = 8 hr, but downtime during the shift reduces actual production time to 7.6 hr on average. This results in an average daily production of 256 units/day. Repositioning time per worker Tr is 8% of cycle time Tc. Determine: Line efficiency, Balancing efficiency, and Repositioning time Tr.What is Man Machine Chart and how to design Man Machine Chart for any process and calculate the utilization for the existing and improved process?
- A high-speed steel tool is used to turn a steel workpart that is 295 mm long and 75 mm in diameter. The parameters in the Taylor equation are: n = 0.15 and C = 80 (m/min) for a feed of 0.5 mm/rev. The operator and machine tool rate = $29.00/hr, and the tooling cost per cutting edge = $3.90. It takes 2.1 min to load and unload the workpart and 3.40 min to change tools. Determine (a) cutting speed for maximum production rate, (b) tool life in min of cutting, and (c) cycle time and cost per unit of product (d) cutting speed for minimum cost and tool life in min of cuttingIn a factory where there are three shifts: The machine overhead cost is found to be £8.20 / hr, the labour overhead cost is found to be £30.20/hr, and the premises overhead cost is found to be £3.50/hr. Using the principle of overhead costing: If a single component takes 23 minutes to manufacture on the milling machine. What is the cost / part? You should include machine costs, labour costs and premises costs in your answer, but you can neglect material and energy costs. Express your answer in £ rounded up to the nearest penny.In a conventional production, operations of turning, splines cutting and grinding are followed in sequence to produce splined shaft for gear boxes and lathe, milling and grinding machines are used for the operations. The reliability of the lathe, milling machine and grinder are 0.89, 0.87 and 0.93 respectively. It has been suggested that to improve reliability two identical machines could be used at each stage. If one fails the other can be used while the first one is being repaired. Another suggestion has been put forward to buy a CNC machining center with a reliability of 0.90 which will do the functions of the lathe and the milling machine. Calculate the system reliability for each of the 3 layouts and decide which is the most reliable