Solve the parts given in the question using six sigma mini tab tools.

MSE 618- Six Sigma Quality Engineering

Homework # 2 (10 points)

You work for a company that manufactures aluminum rods in the machine shop.  The aluminum rods must be 601 mm +/-4 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 and C that manufacture the same part, collected data on 30 aluminum rods at their own facilities (see data below).

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 the machine shop and each supplier A, B and C data set

·         Perform a Process Capability Analysis for the machine shop, supplier A, B, and C

·         Approximate Sigma level for the machine shop, supplier A, B and C (Use

     Cpks)

·         Calculate Cp to determine how much the machine shop and each supplier (A, B and C) sample is consuming out of the spec.

·         Scrap cost for the machine shop and each supplier A, B and C (Use Taguchi analysis)

·         Run  ¯¯ and R chart for the machine shop, supplier A, B, and C