Question: 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

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.

Which tool material would you recommend?
On what basis?

SiN PCBN 12 200 1.25 $28.50 Tips in use per part Tool life (parts per tool) Cost per tip 12 4700

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