Date of Award

Spring 8-1-2001

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Industrial Engineering

First Advisor

Gordon Minty

Second Advisor

Michael Hayden

Third Advisor

S. Joseph Freeze

Abstract

This study was an investigation of the projected lead time and the actual lead time for a part manufactured at Tri-Industries Inc., Terre Haute, Indiana. The research was focused on a single part produced in Tri-Industries. The problem was that there is a difference in the projected lead time and the actual lead time of the part under investigation. The actual lead time was longer than projected lead time, which resulted in the company being delinquent in customer delivery. This investigation was conducted to find out the source for customer delinquency for a single part in Tri-Industries. The conclusion was intended to help the company in a broader investigation into eliminating customer delinquency of the whole plant. The part chosen for the study was Combustor Housing. The data for the study was obtained from the Tri-Industries database. The manufacturing time was broken up into setup time, run time, and wait time. The researcher obtained the actual manufacturing time for the part, combustor housing, for a period of 1 year from the database. The arithmetic mean and standard deviation were calculated and compared with the projected time. Z-value was calculated to find the deviation of the projected time from the actual mean value. The researcher, by analysis of the data collected for the combustor housing,. identified increased wait time as the source for delay in manufacturing. The amount of wait time is such that it is concluded that the wait time is the primary cause for delinquency in the part investigated. It is suggested that the increased wait time may be a generalized cause of customer delinquency for many or all of the products of Trilndustries.

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