Referencing Figure 1-2 from page 14 of the textbook, the cost % to grind a steel part to a tolerance of +/-0.0005 is 270 and the cost to turn it to a tolerance of +/-0.003 is 60.
Grinding versus turning cost is 270/60 = 4.5 times.
In my approach to this problem I used a base of 1.00 so that it would be easier to work with when computing my final answer. I came up with the following values for my equation: Load: 1.10
Using Equation 1-1 from page 17 of the textbook, I computed, nd = (loss of function parameter) / (maximum allowable parameter) nd = (1.10) / (0.85)(0.95)2 nd = 1.43
(a) Using Equation 1-6 from page 23 of the textbook, I estimated the mean to be 121 kcycles.