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Former Member

overlapping

Can someone throw light on the usage of overlapping in routing?

When I use splits the scheduling time is reducing. But when I use the overlapping it is again increasing.

The concept is not clear to me. Reply please.

Thanks and Regards,

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    author's profile photo Former Member
    Former Member
    Posted on Dec 19, 2008 at 08:54 AM

    hi

    To reduce the lead time of a routing or production order you can overlap operations. This means that an operation starts before the previous operation has finished

    You can define for each individual operation whether it should overlap with the next consecutive operation and in what way. To do this you can set the following indicators:

    Required overlapping

    This means the operations always overlap

    Optional overlapping

    This means the operations overlap if scheduling uses a reduction level that allows overlapping

    Flow manufacturing

    This means the system extends the lead time of all operations, that overlap using flow manufacturing, to the same length as the lead time of the longest of these operations. As with required overlapping, the operations always overlap.

    For every type of overlapping you can

    Define a minimum overlap time which only allows overlapping after a particular minimum limit has been reached.

    Define a minimum send-ahead quantity to ensure that the operation is performed for a particular minimum quantity of the material to be produced, before the next operation starts.

    An operation is split if it is carried out on several machines or by several persons at the same time

    Splitting an operation has the following effects on the operation dates:

    The processing time/execution time becomes shorter.

    Setup and teardown must be carried out more than once for the operation

    -ashok

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  • author's profile photo Former Member
    Former Member
    Posted on Dec 19, 2008 at 09:01 AM

    Hi Ram,

    Overlapping is used in Routing Master data for a Material.

    If the overlapping functionality is used in a Routing then the Total duration (Scheduling Time) for the production cycle of a material will reduce.

    If there are multiple operations in a routing say operation 0010 / 0020 / 0030 then if this Overlapping functionality is used against an operation 0010 (which is avl in Operation details screen) then system will start Scheduling the operation 0020 parallely with the operation 0010 once the overlap qty is reached.

    If the overlapping is not used unless the operation 0010 full quantity is processed system will not schedule the operation 0020.

    Hope it is clear.

    regards

    radhak mk

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    • Former Member

      thanks for your immediate response.

      I am using required overlapping. I have about 15 operations. overlapping is working fine for some operations. but for some operations overlapping is increasing the scheduled time. I removed overlapping and checked. still scheduling time has not changed. then I removed the split indicator and checked for these operations. then the time has come down. in another operation of the routing which is carried out on the same work center, overlapping is working fine. where am I going wrong?

      thanks again,

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