Bar Bend Brake

aPriori uses the formulas below to determine costs associated with this bending process.

Accounting Calculations

Labor Time = Cycle Time *
Machine Labor Time Standard * Machine Labor Ratio

Labor time is the product of the following

  • Cycle time (see Cycle Time Calculation)

  • 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.

  • Machine labor ratio (specified as a machine property)

Labor Cost = ((Labor Time / 3600) *
Labor Rate) / Process Yield

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)

  • Process yield (see formula below)

Amortized Batch Setup = (Machine Setup Time *
(Labor Rate + Direct Overhead 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)

  • Direct overhead rate (see Direct and Indirect Overhead)

Process Yield = 1 / (Machine Process Yield/100)

Process yield depends on the machine property Process Yield.

Cycle Time Calculation

Cycle Time = Load and Unload Time + Number of Bends *
(Bending Time + Part Manipulation Time)

Cycle time depends on the following:

  • Load and unload time (obtained from lookup table; see below; increases with part mass, which increases with material density).

  • Number of bends (obtained from GCD extraction)

  • Bending time (specified as a machine property)

  • Part manipulation time (obtained from lookup table; see below; increases with part mass, which increases with material density)

Load and unload times and manipulation times by part mass are contained in the lookup table bendBrakeHandling.