When the slow process occupies six furnace positions, first draw a furnace position-schedule

To judge whether the new slow process will squeeze the existing hot cooking tasks, you cannot just ask "how many of the six burners are empty?" Each task must start from the time when the container is placed on the furnace until it is removed, cleared and restored to a usable state; personnel observation, waiting, temporary adjustments and exception responses during the period must also be recorded separately. First, look for conflicts with explicit hypothetical schedules, and then replace the hypothetical numbers with actual orders and approved process tests in the field.

There are four types of time to remember for a task

"Occupied minutes" is the total time the container makes the furnace space unavailable for other tasks, not just the effective heating time. "Waiting" means that the task is ready but cannot be started because there is no furnace space, container or personnel. "Clearing" is the interval from when the finished product is removed to when the furnace location meets the conditions for use in the next task. "Recovery" refers to the personnel and equipment time required to return the original plan to a trackable state after temporary addition of orders, interruption or rescheduling.

These four types of time cannot be replaced by a "total time spent". If the heating task actually takes only twenty minutes, but because the container cannot be removed immediately, the stove surface needs to be cooled, or the next dish needs to be cleared separately, the time when the stove position is available is not the end of heating. Another example is that a temporary order is eventually completed, but it takes fifteen minutes for the originally scheduled containers, personnel, and labels to be reset. These fifteen minutes are the recovery cost and should not disappear because the customer has received the meal.

The task bar should also indicate "Can the person leave?" Some long-term tasks may occupy furnace space but only require intermittent observation, while others, even if they are short-term, require continuous operation by personnel. If the furnace position is free but there are no employees, or if the employees are free but there are no containers, new tasks cannot be accepted. Therefore, the personnel and container time bars should be juxtaposed next to the furnace table, but do not squeeze the three resources into one grid into a comprehensive color that cannot be traced.

Alto-Shaam's original article introduces the low-temperature cooking and heat preservation of the Cook & Hold oven, and specifically states that the maximum temperature and working mode of this type of equipment are not suitable for use as a convection oven-style production oven. This boundary is important for scheduling: process tasks must first be compatible with equipment capabilities, and scheduling slots by themselves do not make the heating methods of different equipment substitutable. [1]

First use a six-furnace table with explicit assumptions

The following table only demonstrates how to read conflicts. Assume that the scheduling window is 10:00-12:00, and the six furnace positions are numbered 1 to 6; the slow process M occupies furnace positions 1 to 4, and is cleared at 11:10. The times for original dishes A and B and emergency task C are the author’s assumptions, not real canteen orders, nor craft time suggestions.

Furnace position	10:00—10:30	10:30—11:00	11:00—11:30	11:30-12:00
1	M heating	M lasts	M to 11:00, clearing to 11:10	Available after 11:10
2	M heating	M lasts	M to 11:00, clearing to 11:10	Available after 11:10
3	M heating	M lasts	M to 11:00, clearing to 11:10	Spare
4	M heating	M lasts	M to 11:00, clearing to 11:10	Spare
5	A（10:05-10:35）	A clears the area until 10:45, B waits	B（11:00-11:25）＋clearance	Spare
6	A（10:05-10:35）	A clears the area until 10:45, B waits	B（11:00-11:25）＋clearance	Spare

Conflict 1: B originally wanted to use furnace positions 5 and 6 at 10:40, but A’s clearance did not end until 10:45. The preparation of personnel and containers overlaps with the last 5 minutes of clearance, and it still takes 15 minutes after 10:45 to be ready at 11:00. Therefore, the total delay of B from the desired start to the actual start is 20 minutes: the first 5 minutes is the unfinished clearance, and the last 15 minutes is the remaining preparations. Conflict 2: Assume that C arrives at 10:50 and needs two furnace positions. Although the six furnace positions seem to be gradually released after 11:00, M's four furnace positions will not be cleared until 11:10, and Nos. 5 and 6 have been reserved for B. Partial "ceasefire" does not mean that the entire system can accept orders.

It is not assumed that C must be answered first. Record its arrival time, commitment deadline, required oven space and containers, and then compare four paths: wait according to the original menu, use a verified backup task, reschedule with the customer, or reject the order. Do not regard "having received an order" as a reason to destroy the original process conditions. If the team chooses to interrupt order B or task M to pick up C, it must also record the container destination, food safety judgment and recovery time of the original task, otherwise C's waiting will just be passed on to other orders.

In the paper table, you can also add a counterexample: If a certain M furnace stops due to an abnormality at 10:50, it seems to be released early, but this position cannot be assigned to C before the container, furnace surface and abnormal cause are confirmed. The "empty slots" generated by the exception must be marked differently from the available furnace slots after normal completion, otherwise the resource map will encourage people to continue production before the exception processing is completed.

Try adjustments without changing the process first

Regarding the above hypothesis, the first paper test is not to change M to a steam oven or wok, but to see if A or B can be moved forward or backward without changing any dish craftsmanship. Assuming that A's delivery time, food safety, personnel and container conditions permit, A can be moved forward to start at 9:30, and the clearance is completed at 10:10, and B can start as scheduled at 10:40. This is just a hypothetical change in the schedule. The real project still needs to confirm the raw materials, preservation of finished products, personnel, energy and service deadlines. The original position must be retained to see whether the conflict really disappears or is transferred to the personnel or material preparation link at 9:30.

Normal days and peak days should be drawn separately. When there are real orders, record the order arrival, commitment time, occupied furnace space, container, personnel, clearance completion, waiting, cancellation and recovery of each task. When there is no real order-adding data, write a "hypothetical order-adding drill" and do not write the scenario narrative as on-site evidence of what has happened.

When comparing before and after changes, don't rank all issues with an average utilization rate. Calculate at least separately: the minutes occupied by each furnace, the waiting time for each order, the total time for site clearance and abnormal recovery, the period when personnel are required to multi-task at the same time, and orders that are rescheduled or canceled due to inability to undertake. One kind of schedule may make furnace space utilization higher, but at the same time extend the waiting time for all orders; another may reserve more vacancies, but allow abnormal additional orders to be processed without interrupting the original task. The actual choice comes back to the menu commitment and risk boundaries, not to maximizing the color block on the graph.

Before the trial, break down “better than before” into verifiable conditions. For example: B's wait will not exceed the current commitment, M's entire process process parameters and records will not be lost due to rescheduling, A's forward movement will not increase the uncontrolled storage time, verified rollback tasks will still be retained during peak times, and employees do not need to skip clearing or marking in order to meet the schedule. If any of these conditions is violated, the original schedule will be returned without using the total output quantity of the day to cover up the process failure.

Equipment migration must be preceded by irreplaceable conditions

Before moving tasks from the furnace to another piece of equipment, write down the process characteristics that must be retained: heating methods with direct contact with pots, available containers, heating and stirring actions, batch sizes, observation and adjustment points, production standards, food safety processes, and exception fallbacks. Different process equipment can only undertake that task if its official documents allow it, the on-site engineering conditions are passed, and the controlled dish test proves that the above conditions can be retained.

The category names of steaming equipment and frying equipment do not prove that they can replace the slow process of the original furnace. What can enter the migration test can only be specific tasks that are consistent with the functions of the candidate equipment and have verification plans for all irreplaceable conditions, rather than the broad category of "slow food". In contrast, the official page for the Alto-Shaam 500-TH/II clearly states that it is a Cook & Hold oven and describes low-temperature cooking insulation, capacity, dimensions, and manual access. Even if the equipment category is consistent with the original article, the applicability of the dishes and specific models must still be confirmed, not just the scheduling vacancies. [2]

Write down the fallback conditions before going online

The trial sheet clearly states the dishes and food safety conditions that must not be destroyed, the lower limit of available stove positions, the upper limit of acceptable waiting, the range that people and containers must not exceed, and the order to restore the original menu after an abnormality. If only the general schedule indicators are lost, and the original equipment, food, and personnel conditions are all verified to be valid, the original verified schedule will be rolled back. If equipment anomalies are triggered, food status is unclear, or personnel safety conditions are compromised, relevant tasks should be stopped first, affected food isolated, and evaluated according to effective procedures; only after equipment, food, and personnel conditions are confirmed to be restored by authorized personnel, the corresponding parts of the original plan can be restarted. For both types of events, the original location, changed location, order and exception records must be retained, and then it can be determined whether the menu, process, equipment or personnel conditions caused the failure.

The final judgment is not that "the average utilization rate of the six furnace positions has dropped", but whether the order waiting, furnace position occupation, site clearance, personnel return and abnormal recovery have improved at the same time on ordinary days and peak days, and the process and food safety conditions have not been compromised. If a stove is idle for a short period of time, it is not an overall improvement if the cost is that orders are backlogged to another period or employees frequently turn around to carry them.

Three pictures are retained when archiving: the original schedule, the modified schedule, and the actual results when exceptions or rollbacks occur. The three pictures use the same furnace location, time and task number, and do not change the color meaning or delete unfinished tasks midway. This way, the reviewer can track whether a conflict has been eliminated, moved, or renamed, and can continue from the affected task bar the next time the menu, personnel, or equipment changes, rather than reorganizing a new picture based on impressions.

References

• Alto-Shaam Best Practices For Low-Temperature Cooking
• Alto-Shaam 500-TH/II Cook & Hold Oven Classic Control