Weld Clean Up Calculations

Grinding Operation Cycle Time

Cycle Time = Weld Length / Grinding Speed

Cycle time depends on the following:

  • Weld length: determined by geometry extraction or (for virtual welds) specified by the user in the Welding dialog when the weld was created.

  • Grinding speed: specified by the machine property Grinding Speed.

Weld Clean Up Process Accounting

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: 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)

  • 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: 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)

Weld Clean Up process Cycle Time

Cycle Time = (Labor Time / Number of Operators) * Cycle Time Adjustment Factor

  • Labor time (see Weld Clean Up Process Accounting)

  • 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 Digital Factories. 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.