Although many things have been learned to this point and we have made progress, but we are not quite there.

Earlier in the project the team determined that thickness was the main problem relating to the high level

defects in the leveler plates.The analysis has been completed.Now, we want to IMPROVE the process.

You recommend using a design of experiments approach to hopefully realize a breakthrough improvement.

The team brainstorms a long list of possible reasons why the thickness is not capable.From that list, the

team has reduced it down to four factors they want to include in an experiment.They suspect

interactions, so they conclude a fractional factorial can be used (if chosen carefully).

Instructions for you: The fractional factorial DoE is shown below.Use this to answer the questions.

Data:

Factor (-) (+) Trial # Factors Thickness

A: Depth 85 150 -- A B C D

B: Temp 140 155 1 -1 -1 -1 -1 10.797

C: Pressure 850 2500 2 1 -1 -1 1 10.625

D: RPM 4400 4800 3 -1 1 -1 1 10.499

4 1 1 -1 -1 10.765

5 -1 -1 1 1 10.108

6 1 -1 1 -1 10.675

7 -1 1 1 -1 10.625

8 1 1 1 1 10.480

1. What is the sign (+ or -) for the AxC interaction for the 4th trial?

2.What is the resolution as shown above?(III, IV, or V, or Full)

3.What is the "main effect" (average impact) of Pressure?

4a.Which factor has the largest effect?

4B.What is the optimum level?