I am currently having an issue where features of my machined parts are warping. I am using Alloy 7050 Type I and Type III in this particular case. Using a feeler gauge and a certified, calibrated granite slab, I am getting out-of-flatness measurements up to .009, which is significantly out of tolerance relative to my requirements.
I have decided to construct a statistically-designed experiment (design of experiments) to find which specific factors are playing a role, but I want to ensure that I am including all of the factors which may contribute. I don't want to lead the conversation too much by posting what I already listed, but I am looking for others' opinions on what might cause this kind of warping/deflection.