The same grade of cemented carbide tooling is available in two forms for turning operations in the machine shop: disposable inserts and brazed inserts. Feed = 0.30 mm/rev. The Taylor equation parameters for this grade are n = 0.25 and C = 300 (m/min). For the disposable inserts, the price of each insert = $6.00, there are four cutting edges per insert, and the average tool change time = 1.0 min. Forthe brazed insert, the price of the tool = $30.00, and it can be used a total of 15 times before it must be scrapped. The tool change time forthe regrindable tooling = 3.0min. The standardtime to grind orregrind the cutting edge is 5.0min, and the cost rate to grind = $20.00/hr. Machine time on the lathe costs $24.00/hr. The work part to be used in the comparison is 375 mm long and 62.5 mm in diameter, and it takes 2.0 min to load and unload the work. For the two cases, compare the: a. cutting speedsfor minimum cost b. tool lives c. cycle times and costs per unit of production. d. Which tool would you recommend?
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