Mechanical Assembly Calculations
Nut Insert Operation Cycle Time
Cycle Time = Standard Nut Insert Time + Additional Time
Time to insert a nut is the sum of the following:
• Standard nut insert time: this is looked up by the current process and operation in the lookup table tblMechanicalOperationTimes (1.5 seconds in aPriori starting point VPEs).
• Additional time: this is 0 by default. Users can specify additional time with the operation-specific or GCD-specific PSO Nut Insert Obstructed Or Vision. The time added is looked up by the current process, operation, and PSO setting in the lookup table tblMechanicalOperationTimes.
Press Fit Operation Cycle Time
Cycle Time = Standard Press Fit Time + Additional Time
Cycle time is the sum of the following:
• Standard press fit time: by default, this is looked up by the current process and operation in the lookup table tblMechanicalOperationTimes (7.5 seconds in aPriori starting point VPEs).
• Additional time: this is 0 by default. Users can specify additional time with the operation-specific or GCD-specific PSO Press Fit Obstructed Or Vision. The time added is looked up by the current process, operation, and PSO setting in the lookup table tblMechanicalOperationTimes.
Rivet Operation Cycle Time
Cycle Time = Standard Rivet Time + Additional Time
Cycle time is the sum of the following:
• Standard rivet time: by default, this is looked up by the current process and operation in the lookup table tblMechanicalOperationTimes (8 seconds in aPriori starting point VPEs).
• Additional time: this is 0 by default. Users can specify additional time with the operation-specific or GCD-specific PSO Rivet Obstructed Or Vision. The time added is looked up by the current process, operation, and PSO setting in the lookup table tblMechanicalOperationTimes.
Screw Tighten - Manual Operation Cycle Time
Cycle Time = Standard Manual Screw Tightening Time + Additional Time
Cycle time is the sum of the following:
• Standard manual screw tightening time: by default, this is looked up by the current process and operation in the lookup table tblMechanicalOperationTimes (12 seconds in aPriori starting point VPEs).
• Additional time: this is 0 by default. Users can specify additional time with the operation-specific or GCD-specific PSO Screw Tighten - Manual Obstructed Or Vision. The time added is looked up by the current process, operation, and PSO setting in the lookup table tblMechanicalOperationTimes.
Screw Tighten - Power Operation Cycle Time
Cycle Time = Standard Power Screw Tightening Time + Additional Time
Cycle time is the sum of the following:
• Standard power screw tightening time: by default, this is looked up by the current process and operation in the lookup table tblMechanicalOperationTimes (6 seconds in aPriori starting point VPEs).
• Additional time: this is 0 by default. Users can specify additional time with the operation-specific or GCD-specific PSO Screw Tighten - Power Obstructed Or Vision. The time added is looked up by the current process, operation, and PSO setting in the lookup table tblMechanicalOperationTimes.
Snap Fit Operation Cycle Time
Cycle Time = Standard Snap Time + Additional Time
Cycle time is the sum of the following:
• Standard snap fit time: by default, this is looked up by the current process and operation in the lookup table tblMechanicalOperationTimes (3 seconds in aPriori starting point VPEs).
• Additional time: this is 0 by default. Users can specify additional time with the operation-specific or GCD-specific PSO Snap Fit Obstructed Or Vision. The time added is looked up by the current process, operation, and PSO setting in the lookup table tblMechanicalOperationTimes.
Tab Bend Operation Cycle Time
Cycle Time = Tab Bend Time + Additional Time
Cycle time is the sum of the following:
• Standard tab bend time: by default, this is looked up by the current process and operation in the lookup table tblMechanicalOperationTimes (3.5 seconds in aPriori starting point VPEs).
• Additional time: this is 0 by default. Users can specify additional time with the operation-specific or GCD-specific PSO Tab Bend Obstructed Or Vision. The time added is looked up by the current process, operation, and PSO setting in the lookup table tblMechanicalOperationTimes.
Mechanical Assembly Accounting calculations
Labor Time = Operation Cycle Times * Labor Time Standard
Labor time is the product of the following:
• Operation cycle times is sum of the cycle times of all child operations for all subcomponents.
• Labor time standard: specified as the machine property Labor Time Standard. This multiplier is used to account for otherwise unaccounted for factors that affect labor time, such as operator fatigue or time spent by the operator for cleaning or maintenance.
Labor Cost = Labor Time * Labor Rate / Final Yield
Labor cost depends on the following:
• Labor time (see formula)
• Labor rate (specified by the machine property Labor Rate)
• Final yield (see Yields)
Amortized Batch Setup =
(Setup Time * (Labor Rate + Direct Overhead Rate)) / Batch Size
Amortized batch setup depends on the following:
• Setup time (specified as the machine property Setup Time)
• Labor rate (specified by the machine property Labor Rate)
• Direct overhead rate (see Direct and Indirect Overhead)
Mechanical Assembly Process Cycle Time
Cycle Time = (Labor Time / Number of Operators) * Cycle Time Adjustment Factor
• Operation cycle times is sum of the cycle times of all child operations for all subcomponents.
• Number of operators: specified by the machine property Number of Operators.
• Cycle time adjustment factor: specified by the cost model variable cycleTimeAdjustmentFactor; 1 in aPriori starting point VPEs. If you want to model an unbalanced, push assembly line, set cycleTimeAdjustmentFactor to a value greater than 1 in order to account for the cost of extra buffer capacity.
Note that indirect overhead depends on cycle time, while direct overhead depends on labor time. Cycle time contributes to part cost only via indirect overhead.