Tiger Tools Case.pptx 3i2844

Tiger Tools Case Abhishek Shrestha(13519) Avash Shrestha(13520) Deependra Shrestha(13521)

Case Extracted From…  This case Tiger Tools is extracted from

Operations Management, William J Stevenson, 9th Edition, TaTa Mcgraw Hill, Chap – 10, Quality Contro, Pg: 487-488.

Relation to Content with the chapter  This case is related to “Control chart for Variable”.

 Where sample range approach is used to

measure of process variability.  Range control chart used to monitor process dispertion.

Brief Outline of the case  Tiger tools is a division of Drillmore Industries.

 They were trying to lunch a new product  Production Manager asked her assistant to check

the capability of the oven used in their process  He obtained 18 random samples of 20 pieces each.  He had to calculate whether process was capable based on a specification width of 1.44 cm or not.

Analysis  The process seems to be cycling, as indicated by

the control chart for the smaller sample size.  Taking large samples probably resulted in combining the results of several different process means, and therefore did not reveal the changes that were occurring.  By taking smaller samples more frequently, the pattern was easier to separate.

 Since the problem could be corrected, the

variation would decrease and hence the process capability would increase. The will be greater than 1.33.  Small samples may not be sufficient to represent the population as a whole. Though there may be some findings in small samples that large samples might not project, the larger sample is the proper representation of the entire behavior / process. Hence, a large sample should be taken to arrive at more accurate result.

Conclusion  We got a better idea about the application of the

concepts such as quality inspection, recall, trade – in process. Also, we got to know about the application of the statistical concepts and the importance of computing process capability index.

Thank You