Dissertations and Theses @ UNI


Open Access Thesis


Shafting -- Sampling; Shafting -- Quality control;


The machining processes have the uniqueness of discrete production and flexible scheduling as cellular manufacturing design. To ensure the quality of machining products, control charts for Statistical Process Control (SPC) has been implemented in the company to monitor the machining process. Sampling is an essential part of data collection for SPC control charts and sampling should be done for machining processes becomes an issue in the company.

This study focused on the investigation of SPC sampling frequencies for shaft bearing turning process using the technique of Average Production Length (APL). The purpose of the study was to identify the SPC sampling frequency for turning process. Study results indicated that the 100% inspection has significant shorter APL than 1/10 and 1/20 SPC sampling frequencies, and based on the study result, 1/10 is preferred over 1/20. The result provides insight on the SPC sampling frequencies in enabling the company to select an economical SPC sampling frequency for the machining manufacturing process.

Year of Submission


Degree Name

Master of Science


Department of Industrial Technology

First Advisor

Zhe Zhang


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Date Original


Object Description

1 PDF file (56 pages)



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