Tool cost is often used as the major criterion for justifying tool selection.

Tool cost is often used as the major criterion for justifying toolselection. Either silicon nitride or PCBN insert tips can beused to machine (bore) a cylinder block on a transfer line ata rate of 312,000 parts/yr (material: gray cast iron).The operationrequires 12 inserts (2 per tool), as six bores are machinedsimultaneously.The machine was run at 2600 sfpm with a feedof 0.014 in. at 0.005-in. DOC for finishing. Here are someadditional data