We are using ECD OvenRIDER to validate our reflow ovens on a weekly basis to have the data to show our customers that the board we ran 3 months ago saw the same oven condition as the one ran yesterday. Cp/ Cpk is calculated by ECD using a manually input +/- 2.5 Degree Spec Limit around the mean Control limits +/-3 sigma. I was curious to hear if others are doing the same, and if so, what criteria do you track? Oven Process Peak (using the pucks), Oven Ambient (using the open air TC's), etc. How would one monitor and show belt speed fluctuation? I'm using Process Delta through a middle zone, figure if it spends the same time traveling through a zone (speed) then the process delta in that zone should be the same and therefore the speed is the same. Last but not least, do you compare oven to oven using the same recipe, and how much of a difference between ovens do you see? We want/ do share recipes between like ovens. No two ovens are exactly the same, but how close is close enough?
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