Six Sigma Quality Engineering

MSE 618- Six Sigma Quality Engineering
You work for a company that manufactures aluminum rods in the machine shop.  The aluminum rods must be 604 mm +/-2 mm long to meet customer’s specifications. There has been a chronic problem with rods length being out of specifications causing high scrap and rework rates.
For a month, data was collected on the length of 30 aluminum rods in the machine shop. Also, three suppliers A, B,C and D that manufacture the same part, collected data on 30 aluminum rods at their own facilities

Question:
Should the company continue producing aluminum rods or buy parts from outside suppliers? You have been asked to lead a problem-solving team and recommend a solution. Hint:
You must run the following analysis, study results and make a recommendation:
•    Run a normality test for each supplier data set
•    Perform a Process Capability Analysis for the machine shop, supplier A, B and C.
•    Sigma level for each supplier (Cp & Cpk)
•    Scrap cost for each supplier
•    Run X and R chart for the machine shop, supplier A, B and C.

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