Tool cost is often used as the major criterion for justifying tool selection. Either silicon nitride or PCBN insert tips can be used to machine (bore) a cylinder block on a transfer line at a rate of 312,000 parts/yr (material gray cast iron).The operation requires 12 inserts (two per tool), as six bores are machined simultaneously. The machine was run at 2600 sfpm with a feed of 0.014 in. at 0.005 in. DOC for finishing. Here are some additional data.
On what basis?
This question was answered on: Jul 11, 2017
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