Expendable Tooling Costs
Machining operations that use tools incur the cost for the tools, amortized over the life of the tool.
Tool Cost = Tool Life Fraction * Tool Life Cost * Tool Cost Adjustment
• Tool life fraction: fraction of the tool’s life used up by the current operation. See the formula below.
• Tool life cost: total cost of the tool. Established by tool selection—see
Tool Selection for Machining.
• Tool cost adjustment: value of the cost model variable toolCostAdjustmentFactor. This defaults to 1. VPE administrators can change the cost model variable to globally adjust tool costs for machining.
Tool Life Fraction = Chipmaking Time / Tool Life
• Chipmaking time: chipmaking time for the current operation—see
Operation Cycle Time and Cut Time Calculations.
• Tool life: amount of chipmaking time for which the tool can be used before it is worn out. An initial value for this is established by tool selection (see
Tool Selection for Machining). aPriori uses Taylor’s equation for tool life expectancy with the data from
tblToolLifeCompensation to adjust the initial value based on the feeds, speeds in use for the current operation. The adjusted value is used in this formula.
Expendable tooling costs for keyway broaching are not based on the above formulas; rather they are based on typical per operation expendable tooling costs as specified by the toolshop variable expendableToolingCost_PullTypeKeywayBroach (for Single Pass Keyway Broaching) or expendableToolingCost_ShimTypeKeywayBroach (for Multipass Keyway Broaching).