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Brief

There was a mistake in the previous spec in which we modified duration calculations. The effective time cunsuption term was not well defined.

The current algorithms that calculates effective time consuption should only by used now for internal calculations of operations start and stop dates.

We remove this value from the GUI and reports of calculations and replace it with other better defined values.

Mockup - in order

Mockup - standalone calculator

Algorithms

Operations labor and machine work time

Abstract operations work time = Cycle time * Numer of cycles needed in order + if

  • if include setup time then
    • + Setup time * Number of workstations
  • if include additional time them:
    • + Additional time * Number of workstations

Operations machine work time = Abstract operations work time * Machine utilization

Operations labor work time = Abstract operations work time * Labor utilization

Order machine work time = SUM(Operations machine work time)

Order labor work time = SUM(Operations labor work time)

Same algorithm should be used in:

  • cost calculations
  • planned values in production balance

The Abstract operations work time is a very abstract value and should not be show to the user in any scenario. Only the machine work time and labor work time make perfect sense for the user.

Operation dates - calculated from orders start dane

Operations start date = if

  • has no children operations then
    • Operations start date = Order start date
  • else
    • Operations start date = MAX(Next operation blocked to date calculated for children operations)

Operations duration time without nonworking time = Setup time + Additional time + if

  • not Divisible cycle time  then
    • + Cycle time * roundUp(Numer of cycles needed in order / Number of workstations)
  • else
    • + Cycle time * (Numer of cycles needed in order / Number of workstations)

Operations duration time = Operations duration time without nonworking time distributed across working time of shifts

Operations end date = Operations start date + Operations duration time

Next operations after block date = if

  • Next operation after type == Produced all
    • = Operations end date
  • Next operation after type == Produced specified quantity
    • = Operations start date + Next operations block duration

Next operation after cycles = required number of cycles to produce Next operation after produced quantity

Next operation block duration without nonworking time = Operations start date + Setup time + if

  • not Divisible cycle time  then
    • + Cycle time * roundUp(Next operation after cycles / Number of workstations)
  • else then
    • + Cycle time * (Next operation after cycles / Number of workstations)

Next operation block duration = Next operation block duration without nonworking time distributed across working time of shifts

Operations table in costs calculation

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