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Subject: Process Capability of SM & Wavesoldering

Date: 03/14/02 at 9:02 AM
Posted by: Chris May
E-mail: cmay@horstmann.co.uk
Message Posted:

Dear all,

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.

Kind regards,

Chris May


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