Originally Posted by Yamadog
Let's see... I made this statement: ".....So my conclusion: there is a small magnetic field assoicated with some crownwheel bearings. How significant this is to failure of these bearings can only be a matter of speculation, BUT as you point out demagnetizing them is easy and can't hurt.", and you responded with the above post.
Well, I do have an education which includes advanced statistics. I can read your link and understand it; I am familiar with the terms.
After an understanding of "t", ANOVA, etc. I still find that the most salient quote regarding stastics is: "Statistics don't lie, but liers use stastitics." Second to that is: "if you can't dazzle 'em with brilliance, baffle 'em with bullsht" comes to mind.
If you read my statement, you saw such qualifers as "some" and "speculation". No where did I suggest that there has been a demonstrated causal link between magnetized bearings and FD failure. And I certainly didn't pose an hypothesis with data that could be meaningfully analyzed by statistical analysis. Frankly, I am pretty careful not to do that.
What exactly is the point of your statement: "Not exactly Anova testing." ?
Clearly no one has generated enough data to demonstrate a clear causal link regarding FD failures; never mind statistical significance. The cause of FD failures is a matter of speculation. I have simply tried, with the help of members of this board, to understand and shed some light on what factors may be contributing to FD failures. Many thoughtful and knowledge people have posted and contributed to our understanding of what may be making these drives fail. Professional mechanics and mechanical engineers both have weighed in with good observations, suggestions, and information. I regard their contributions to our understanding of FD failures as efforts worth emulating.