Abstract
The determination of reject allowances for job shop set-ups usually considers defects to occur randomly through the production run. It is suggested that most defects arise during and just after the setting-up stage. An analysis is conducted considering the setting-up stage as a learning process and incorporating the effects of additional set-ups. The analysis is extended to cover the effects of a single production station and a multi-station model, where rejects may occur at any station. The model was tested against a sample of actual jobs in a largo manufacturing company. It was demonstrated that the multistation model using a skill and learning probability distribution was the more adequate model, but experienced judgement achieved slightly better results than this model.
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