Shift Operation Sequence

[Former Member]

Dear Friends,

I have a question regarding the duration of operations in PP Order.

Let's say, we have two operations, 1 and 2. Each of the operations has duration of 30 minutes, for example. When we have to make only one piece of finished good, we have to spend 1 hour. And it is correct.

But when we have to make 10 pieces of finished good, we don't have to wait untill we repeat the first operation 10 times before starting the second operation. Because after the firs piece has passed the first operation, it can be processed further. That way we spend only 330 minutes instead of 600 minutes.

Situation 1. - consecutive sequence

Operation1

| - - - - - - - - - - => 30min. X 10 pc = 300 min.

Operation2

| - - - - - - - - - - => 30min. X 10 pc = 300 min

=> Operation1+Operation2 = 600min ( all the pieces have passed through the first operation, then through the second one)

Situation 2. - consecutive-parallel sequence

Operation1

| - - - - - - - - - - =>30min X 10 pc = 300 min

Operation2

| - - - - - - - - - - =>30min X 10 pc = 300 min, BUT

Operation1+Operation2 = only 330 min! (after the first piece has passed Operation1, the two operations are processed in parallel)

Do you have any idea how to find some rule, some formula, that describes any case like the second situation? (As it is in the real life! )

Of course, any helpful answer will be generously regarded

Thanks in advance!

[Former Member · Accepted solution]

YOU CAN ALSO UISE SEND AHEAD QTY TO ACHIVE THE SAME

[Former Member · Accepted solution]

Dear Rajesha Vittal , would you please clarify your point ?

Thanks!

[Former Member · Accepted solution]

hi,

There are two ways to define overlapping.

1) Minimum time after which overlapping should start (as explaiined by Thaila Shree)

2) minimum qty processed in 1st operation after which overlapping should start.

This partial qty of the lot which you are sending forward to the next operation, before the whole lot is processed at operation 1 is called send ahead quantity.

Hope it is clear now.

Regards,

Ashok

[Former Member · Accepted solution]

In routing in the operation detailed screen,

in the overlaping sub screen,

activate continues flow radio button. H9owm it works is given below

You use this indicator to stipulate that the operations always (irrespective of the reduction startegy for the operation) overlap, if the conditions for an overlap are fulfilled.

The system extends the execution time of all the overlapping operations, for which the indicator has been set, so that it is as long as the execution time of the longest operation.

During scheduling the system determines from the minimum send-ahead quantity and the minimum overlap time.

Whether the operations can overlap

An overlap is only permissible, if the time the operations overlap is larger than the minimum overlap time.

When is the start date of the following operation

If operations overlap, the next operation can start when the minimum send-ahead quantity has been produced. If a move is necessary, this is taken into account with the minimum move time.

The following operation is scheduled so that no interruptions occur.

[Former Member · Accepted solution]

Thanks to everybody for the cooperation!

All the best to you!

[Former Member]

Hi,

You can achieve this by using Overlapping between the two operations by Min. Overlapping time say 30 min as per your example.

Check with the above..

-Thaila Shree