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<p class="MsoPlainText">Around 40 years ago I was involved with technical support of a product that used an early PLC mated to DC Drives in cut to length on the fly machinery. At room temperature of around 98
<sup>o</sup>F, it would start to miscount. In fact, you could put your finger on the chip where the calculations were being performed and burn it. A muffin fan blew air in the direction of the overheated chip but wires obstructed the flow.<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">I went to R&D and asked what the test results were that resulted in the 40
<sup>o</sup>C rating. They said that was a standard rating. After some more questioning by me, it was revealed that there had been no testing done.
<o:p></o:p></p>
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<p class="MsoPlainText">[Stephen Offiler] Agreed, Jim, that's also a possible scenario. Something is deforming plastically, and there could be some failure of the head material in compression. And, I usually default to the same competence assumption - "some
engineer must have measured that".<o:p></o:p></p>
<p class="MsoPlainText"><o:p> </o:p></p>
<p class="MsoPlainText">[Jim Becker] I agree the whole head isn’t going to shrink. However, I can imagine the pressure from the head bolts acting on the overheated head to cause some displacement of the head material. When cooled back to a normal temperature,
the dimension from where the head bolts contact the head to the gasket surface could be reduced. This could be confirmed by measurement before and after.<o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
<p class="MsoPlainText">Having not seen the actual wording of the bulletin, I could imagine it stating something to that effect. I would presume someone at Satoh made such measurements.<o:p></o:p></p>
<p class="MsoPlainText"> <o:p></o:p></p>
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