Machining Process-level Options
Machining processes provide the following options (not all processes provide all options):
• Workholder Type: drives
Batch Setup Time.
o Use default value: turning uses a 3 Jaw Chuck by default. Milling uses a Plain Milling Vise by default, if the part is small enough; otherwise Non-modular Fixturing is used by default. A part is small enough if its largest dimension does not exceed the value of the cost model variable maxViseSize (406.4mm in starting point VPEs).
o User override: choose a type from the dropdown list. (The items in the list are taken from the lookup table tblInstallingMillingWorkholders or tblInstallingTurningWorkholders.)
Notes on selected milling workholder types:
o Adjustable Milling Vise: the workpiece angle is adjustable.
o Non-modular Fixturing: this is a custom fixture dedicated to a specific part or family of parts.
o Table Clamping: the workpiece is clamped so that clamping force is transferred directly to table.
• Batch Setup Time: total setup time for a batch. This time is attributed to individual parts by dividing the batch setup time by the batch size specified on the Production Info tab of the Cost Object window.
o Use default value: calculated setup time, based on a number of considerations, including tool count, setup count. See also Parts in Pallet, Install Workholder, and Cleanup Time, below.
o User override: specify a value in hours.
• Fixture Cost: cost of the required fixture. Fixture cost is amortized over the total production volume.
o Use default value: calculated cost to build the fixture. The calculation is based on a number of factors, including the number of different tools required by the operation, as well as the machine labor rate (as specified by the machine property workcenterLaborRate and the cost model variable laborRateAdjustmentFactor) and overhead rate (as specified by the machine property workcenterOverheadRate and the cost model variable overheadRateAdjustmentFactor).
o User Override: specify a cost to override the default.
• Hard Tooling Cost: cost of additional hard tooling required to machine the part, such as the cost of jigs. Hard tooling cost is amortized over the total production volume. Select one of the following options:
o Use default value: hard tooling cost defaults to 0 in aPriori starting point VPEs.
o User override: specify a cost to override the default
• NC Programming Cost: NC programming and debugging cost for the current part. Select one of the following options:
o Use default value: estimate of the programming and debugging cost based on a number of factors, including the number of different tools required by the operation, as well as the machine labor rate (as specified by the machine property workcenterLaborRate and the cost model variable laborRateAdjustmentFactor).
o User Override: specify a cost to override the default.
• Parts in Pallet: number of parts on each pallet. Calculated batch setup time increases as Parts in Pallet increases. This defaults to 1 but can be overridden. Select one of the following options:
o Use default value: each pallet is assumed to have a single part.
o User override: specify a whole number greater than 0.
• Install Workholder: time to install a workholder. Calculated batch setup time increases as this time increases. This defaults to 0, but can be overridden. Select one of the following options:
o Use default value: the time is assumed to be 0.
o User override: specify a time in seconds.
• Cleanup Time: time to clean up after batch is done. Calculated batch setup time increases as this time increases. This defaults to 0, but can be overridden. Select one of the following options:
o Use default value: the time is assumed to be 0.
o User override: specify a time in seconds.
• Max Facing Tool Diameter: constrains the tools aPriori selects for facing operations. Select one of the following options:
o Use default value: calculated based on a number of factors, including part dimensions and data in tblOperationSizeRanges.
o User override: specify a diameter in millimeters.
• Max Side Milling Tool Diameter: constrains the tools aPriori selects for side milling operations. Select one of the following options:
o Use default value: calculated based on a number of factors, including part dimensions and data in tblOperationSizeRanges.
o User override: specify a diameter in millimeters.
• Max Roughing Tool Diameter: constrains the tools aPriori selects for roughing operations. Select one of the following options:
o Use default value: calculated based on a number of factors, including part dimensions and data in tblOperationSizeRanges.
o User override: specify a diameter in millimeters.
• Max Contouring Tool Diameter: constrains the tools aPriori selects for contouring operations. Select one of the following options:
o Use default value: calculated based on a number of factors, including part dimensions and data in tblOperationSizeRanges.
o User override: specify a diameter in millimeters.