You arrive to work on Monday moring and the assembly equipme

You arrive to work on Monday moring and the assembly equipment you designed is broken. Maintance trying to figure the issue. Here is some data taken every 5 minutes by equipment\'s control system;

Drive motor Rpm: 34, 46, 47, 39, 40, 50, 38,50,45,38

Assembly arm pressure(psi): 210, 208, 205, 204, 200, 211, 203, 206, 200, 200

grip arm pressure (psi): 65, 60, 61, 63, 65, 67, 68, 70, 64, 78

system Voltage: 480, 478, 480, 481, 479, 480, 479, 478, 485, 482

Each of these system parameters hae specifications that you designed to prevent failure of the equipment;

Parameter: min Failure Specification / max Failure Specification

- Drive motor RPM 30 50

- Assembly arm pressure; 180 / 220

- Grip arm pressure; 58 / 82

- system Amperage; 475 / 491

Questions:

1. what are the calculated control limits of each paramaeter asseming -/+ sigma ?

2. Calculate the sample standard deviation for each parameter ?

3. You boss wants you to present data to him for each parameter in box plot diagram. Whiskers (UCL,LCL), Asterisk (outliers), Box (25th precentile,75th percentile, median)

4. Which of above parameters (if any) are reason that process failed ?

5. Your boss wants you to redesign the equipment such that the failure specifications are outside the control limits of the data. Is this a good idea ? Explain why it may or may not be a good idea ?

6. If you find any of the above paramenters to be the problem, and redesign the equipment, would the new min and max fialure specifications be for those parameters ?

Solution