WaveRIDER 155
APPENDIX B: Statistical Process Control (SPC) Background Information
This appendix deals with the subset of SPC that is incorporated into WaveRIDER SPC.
It does not address general SPC principals. A working knowledge of general statistical
principals and SPC terms is assumed and is not addressed here. There are many good
basic SPC books where this information may be obtained.
Wave Solder operators, engineers and production managers are expected to
understand their wave soldering process so as to deliver quality products cost
effectively. This is a continuous process.
First, the wave solder machine must be checked for consistency. A standard or typical
set up should be routinely checked prior to any process set point determinations, or
actual production run machine checks. Only after the machine has been determined to
be operating correctly and not experiencing abnormal variation, should data from the
wave solder machine be utilized. SPC is all about identifying common or normal
variation from abnormal variation.
Second, the correct process set points must be determined for a particular product.
Utilizing the ECD SuperM.O.L.E. Gold profiler, the correct set points for a particular
product may be determined. These set points, if selected correctly and followed, should
deliver the maximum throughput of quality product.
Third, the wave solder machine must consistently deliver the correctly determined set
points. SPC will help identify common or normal variation from abnormal variation.
Checking the wave solder machine using your ECD WaveRIDER with its SPC capability
will help ensure that the reflow oven is consistently performing to it’s set points and your
expectations.
Fourth, repeat the above three steps. Continuous improvement is a never-ending cycle.
Check the long-term variation of the wave solder machine by graphing typical set point
samples. Using the SuperM.O.L.E. Gold profiler, recheck/adjust part number specific
set points to maximize your quality throughput. Check the machine during a part
number run to control the machine variation from that part number’s actual ideal set
points.
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