Overhead Calculations for Composites
For each process, direct overhead cost per part are calculated with the following formulas:
Direct Overhead Cost =
Labor Dependent Direct Overhead Cost +
Labor Independent Direct Overhead Cost
Direct overhead cost per part is the sum of the following:
• Labor-dependent direct overhead cost: this is the direct overhead associated with labor-dependent tasks (see Labor-dependent and Labor-independent Tasks). See formula.
• Labor-independent direct overhead cost: this is the direct overhead associated with labor-independent tasks (see Labor-dependent and Labor-independent Tasks). See formula.
Labor Dependent Direct Overhead Cost =
((Labor Cost * Overhead Multiplier) +
(Direct Overhead Rate * Labor Dependent Process Time)) /
Final Yield
Labor-dependent direct overhead cost depends on the following:
• Labor cost: this is the value of the formula Labor Cost for the current process. See Cost Algorithms and Calculations for Composites.
• Overhead multiplier: specified by the machine property Overhead Multiplier for the current process’s machine.
• Direct overhead rate (see Overhead Rates)
• Labor-dependent process time: for each process, this is the value of the formula Labor Dependent Process Time. See Cost Algorithms and Calculations for Composites.
• Final yield (see Yields for Composites)
Labor Independent Direct Overhead Cost =
Machine Allocation Factor *
((Direct Overhead Rate * Labor Independent Process Time)) /
Final Yield
Labor-independent direct overhead cost depends on the following:
• Machine allocation factor: this is the fraction of the machine used by a single part during a machine cycle. For most processes it is 1, because the machine is assumed to handle one part at a time. For Autoclave Cure in some cases, this fraction is calculated based on tool dimensions and machine dimensions (see Shared Autoclave Capacity).
• Direct overhead rate (see Overhead Rates)
• Labor-independent process time: for each process, this is the value of the formula Labor Independent Process Time. See Cost Algorithms and Calculations for Composites.
• Final yield (see Yields for Composites)