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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?The CNC grinding section has a large number of machines devoted to grinding shafts for the automotive industry. The grinding machine cycle takes 5.6 min. At the end of this cycle an operator must be present to unload and load parts, which takes 120 sec. a) Determine how many grinding machines the worker can service if it takes 45 sec to walk between the machines and no machine ideal time is allowed. b) How many seconds during the work cycle is the worker idle? c) What is the hourly production rate of this machine cluster?
- Depth-of-cut range for surface grinding is: a. 0.010"0.100" b. 0.0001"0.0002" c. 0.0001"0.003" d. 0.00001"0.00005"1) The specification of a grinding wheel is given as follows: 32A 40 L10 B Give the complete interpretation of the underlined segments in the grinding wheel specification. 2) Explain briefly how the dressing operation is performed prior to grinding on a surface grinding machine. 3) As the manager of a large machining workshop you are required to prepare the specifications of a lathe machine to be purchased to replace an old one which has been used for the last 25 years. Outline the main specifications that you deem important to suit the requirements of the workshop. 4) Outline the principle of Electro Discharge Machining (EDM) and its scope of use in industry. 5) Outline the principle of Ultra Sonic testing for checking deeply imbedded defects in a welded joint.A company makes two kinds of door Knobs, standard and deluxe ,the making process cost the company 15$ for the standard and 20$ for the deluxe by making on a grinder and a smoother machines, which they can be run for at most 80 hours a week, each standard one needs 2 hours on the grinder, and 4 hours on the smoother, and each deluxe one needs 4 hours on the grinder and 3 hours on the smoother ,the company sales at 25$,35$ for the standard and the deluxe respectively. To have the profit it wants the company decide to make at least 15 knobs from them at a week, formulate the linear programming model?
- 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 reliableA 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 cuttinga) Grinding wheel manufacturer has written the following information"W A 10 E 4 S 17" on the grinding wheel. Explain
- In a turning operation of stainless-steel work part having shear strength = 378 MPa and tensile strength = 420 MPa, a coated carbide tool with a rake angle of 5 degrees is used to reduce its diameter from 100 mm to 93.2 mm with a cutting ratio of 0.45. During this process, a cutting speed of 2.4 m/s and feed of 0.24 mm/rev is used. Using the orthogonal model to approximate the turning process, how much power (W) will the lathe draw in performing this operation if its mechanical efficiency = 90%.Standard time & work sampling The following data resulted from a time study made on a horizontal milling machine: Mean manual effort time per cycle: 4.62 min Mean cutting time (power feed): 3.74 min Mean performance rating: 115 percent Machine allowance (power feed): 10 percent Fatigue allowance: 15 percent questions: 1.) What is the Basic Time for the manual effort? 2.) What is the Standard Time for the manual effort? 3.) What is the Standard Time for the machine?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.