# Question: A process engineer is trying to improve the life of

A process engineer is trying to improve the life of a cutting tool. He has run a 23 experiment using cutting speed (A), metal hardness (B), and cutting angle (C) as the factors. The data from two replicates are shown in Table 8E.2.

a. Do any of the three factors affect tool life?

b. What combination of factor levels produces the longest tool life?

c. Is there a combination of cutting speed and cutting angle that always gives good results regardless of metal hardness?

a. Do any of the three factors affect tool life?

b. What combination of factor levels produces the longest tool life?

c. Is there a combination of cutting speed and cutting angle that always gives good results regardless of metal hardness?

## Relevant Questions

Find the residuals from the tool life experiment in Exercise 8.2. Construct a normal probability plot of the residuals. Plot the residuals versus the predicted values. Comment on the plots. Suppose that only one replicate of the 24 design in exercise 8.4 could be run, and that we could only conduct eight tests each day. Set up a design that would block out the day effect. Show specifically which runs would be ...Suppose that you have 15 observations on the number of hours to failure of a unit. The observations are 442, 381, 960, 571, 1861, 162, 334, 825, 2562, 324, 312, 368, 367, 968, and 15. Is the exponential distribution a ...A simple series system is shown in the accompanying figure. The reliability of each component is shown in the figure. Assuming that the components operate independently, calculate the system reliability. A component in an automobile door latch has an exponential time to failure distribution with cycles. What are the mean and variance of the number of cycles to failure? What is the reliability at 8,000 cycles?Post your question