aPriori uses the formulas below to determine costs associated with this process.
Accounting Calculations
Labor Time = Cycle Time * Machine Labor Time Standard
Labor time is the product of the following
-
Cycle time (see Cycle Time Calculation)
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Machine labor time standard (specified as a machine property). This value reflects the amount of time spent by machine operators in between machine cycles, including time performing maintenance and cleaning tasks as well as time pausing between tasks. The amount is expressed as a cycle time multiplier.
Labor Cost = (Labor Time / 3600) * Labor Rate
Labor cost is a function of the following:
-
Labor time (see formula above)
-
Labor rate: this is the product of the following:
- Machine property Labor Rate
- Cost model variable laborRateAdjustmentFactor (1 in starting point Digital Factories)
- Machine property Work Center Labor Rate Factor (1 in starting point Digital Factories)
Amortized Batch Setup = Machine Setup Time *
Machine Labor Rate / Batch Size
Amortized batch setup is a function of the following:
-
Machine setup time (specified as a machine property)
-
Labor rate: this is the product of the following:
- Machine property Labor Rate
- Cost model variable laborRateAdjustmentFactor (1 in starting point Digital Factories)
- Machine property Work Center Labor Rate Factor (1 in starting point Digital Factories)
-
Batch size (specified in the Production Info dialog)
Period Overhead = 0
Period overhead is always 0.
Cycle Time Calculation
Cycle Time = Punch Time + Nibble Time + Tool Change Time +
(Machine Labor Handling Time / Number of Parts Per Sheet)
Cycle time depends on the following:
-
Punch time
-
Nibble time
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Tool change time (increases with increased variability in feature dimensions)
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Machine labor handling time (obtained from lookup by part mass in smTurretPressHandling)
-
Number of parts per sheet (calculated based on part geometry, nesting type, and sheet dimensions – see Number Of Parts Per Sheet for more information)
Expendable Tooling
Expendable Tooling Cost = (Special Hole Tool Avg Cost *
Small Special Tools) +
(Countersink Tool Avg Cost * Countersink Tools) +
(Form Tool Avg Cost * Form Tools) +
(Perforate Tool Avg Cost * Perforation Tools)
Expendable tooling cost depends on the number and cost of the various types of tools.