Integral Logistics Management — Operations Management and Supply Chain Management Within and Across Companies

13.1.3 The Elements of Inter­operation Time

Intended learning outcomes: Identify the elements of interoperation time. Differentiate between technical wait time and nontechnical wait time. Describe transportation time.

Inter­operation time occurs before or after an operation (see definition in Section 1.2.3). Figure shows the elements of inter­operation time:

Fig.       The elements of inter­operation time.

  • Technical wait time after an operation describes the time required to complete testing, a chemical reaction, a cool-down period, or other things. It is an attribute of the operation. As is true of the operation itself, it is not generally possible to shorten this wait time, for example, to accelerate the order.
  • Nontechnical wait time after an operation is the wait time incurred before the lot is collected for transport. It is dependent on the work center and can be an attribute of this object or be included in transportation time.
  • Transportation time, also called move time, move time, or transit time, is the time needed to transport the lot from the current work center to the work center that will carry out the subsequent operation. This time is dependent on both work centers. There are various techniques for determining this time (see Section 13.1.5).
  • Nontechnical wait time before an operation is made up of the so-called queue time, that is, the amount of time a job waits at a work center before setup or work is performed on the job. This includes preparation time for the operation, as long as it is not counted as a part of the actual setup time. This time is dependent on the work center and is an attribute of that object (see Section 13.2).
  • Technical wait time before an operation is made up of the operation-specific preparation time, such as a warm-up process, which does not yet load the work center. In practice, this time is of minor significance. It is an attribute of the operation.[note 1303]

All components of inter­operation time, with the exception of technical wait times before and after the operation, are “elastic”: We can lengthen or shorten them depending on the load at the work center and the order urgency (compare Section 13.3.6). Therefore, the values specified in the master data are only average values, and they can fluctuate widely.

Course section 13.1: Subsections and their intended learning outcomes

  • 13.1.4 Administrative Time

    Intended learning outcomes: Describe the need and the various kinds of administrative time.

  • 13.1.5 Transportation Time

    Intended learning outcomes: Explain the transportation times matrix. Disclose a robust approximation of transportation time.