Engineering, 16.04.2020 02:52 brillamontijo

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 = 0.20 mm/rev. The Taylor equation parameters for this grade are n = 0.35and C = X2 (m/min). For the disposable inserts, the price of each insert = $12.00, there are three cutting edges per insert, and the average tool change time = 2.0 min. For the brazed insert, the price of the tool = $20.00, and it can be used a total of 15 times before it must be scrapped. The tool change time for the regrindable tooling = 5.0 min. The standard time to grind or regrind the cutting edge is 7.0 min, and the cost rate to grind = $24.00/hr. Machine time on the lathe costs $36.00/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 (a) the cutting speeds for minimum cost. (b) the tool lives (c) the cycle times and cost per unit (d) which one would you recommend? Explain Why.

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