I am trying to find the effects of feed rate, cutting speed and depth of cut on surface roughness. I have five sets of feed rate ( 0.09, 0.10, 0.125, 0.150. 0.175), four sets of speed (41, 53, 66, 82) and two sets of depth of cut (0.5 mm and 1 mm).

Like: 0.09-41-0.5 = 3.65

0.09-53-0.5 = 3.41

............. Total 40 results (5x4x2)

As there are different levels associated how can I perform ANOVA ? Do i need to add weights to depth of cut as it has only two sets ? (I am using normal way on Minitab 17 but results were not what I was expecting)

Like: 0.09-41-0.5 = 3.65

0.09-53-0.5 = 3.41

............. Total 40 results (5x4x2)

As there are different levels associated how can I perform ANOVA ? Do i need to add weights to depth of cut as it has only two sets ? (I am using normal way on Minitab 17 but results were not what I was expecting)

Last edited: