Is anyone using control charts (x-bar, R, etc) to control processes such as SM lines and flowsoldering?
How did you arrive at the USL & LSL / UCL & LCL?
For a flowsolder machine, would it be best to take the fluxer, conveyor, preheat and pot temp individually, take sample readings and then calculate the limits etc from that?
I am interested in how other engineers/qa are controlling these processes using SPC/Six Sigma tools.
I have got my head around the math side of things, but the application to a soldering process is escaping me at present.
What are the upper and lower limits for a total wavesolder process if you deal with (say) shorts?
Ideally zero for lower limit (and upper).
If anyone has implemented this kind of approach I would appreciate some pointers.