Deriving the detailed machine schedule from a weekly MRP requirement

Prashanth Nagendra, Sanchoy K. Das, Sita Nathan

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


In this paper we present a mould shop scheduler (MSS) that was developed for the Moulding Division at a major US telecommunications equipment manufacturer. This plant consists of close to 100 injection-moulding machines, and over 1000 different moulds are used to manufacture more than 1500 different parts. The MSS procedure reads the MRP orders at the start of each week, and then generates for each machine the sequence of parts or orders to be processed, the production quantity, and the sequence of mould and material changeovers. The MRP orders are generated by a corporate system that is responsible for plant-wide scheduling. In developing the daily schedule, the objectives of the MSS procedure are to: (i) reduce the total time spent on setups; and (ii) minimize the inventory of finished parts. The MSS procedure consists of four heuristic algorithms that are sequentially solved. The use of the algorithms is illustrated by an example, and a comparison with a lot- for-lot MRP implementation is shown.

Original languageEnglish (US)
Pages (from-to)547-555
Number of pages9
JournalProduction Planning and Control
Issue number6
StatePublished - Jan 1 2000

All Science Journal Classification (ASJC) codes

  • Computer Science Applications
  • Strategy and Management
  • Management Science and Operations Research
  • Industrial and Manufacturing Engineering


  • MRP
  • Parallel machines
  • Scheduling


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