[AT] Statistics In Tractor Manufacturing

[Stephen Offiler]

It's a reasonable default position to assume competence, but by no means am
I trying to say there aren't many exceptions.  If you think about it, it's
less reasonable to take the opposite position and default to the assumption
of incompetence.  You'd have a hard time ever trusting anything.

SO

On Fri, Sep 20, 2019 at 8:25 AM Jack <jacktractor at live.com> wrote:

> 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 oF, 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.
>
>
>
> I went to R&D and asked what the test results were that resulted in the 40
> oC rating. They said that was a standard rating. After some more
> questioning by me, it was revealed that there had been no testing done.
>
>
>
> [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".
>
>
>
> [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.
>
>
>
> 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.
>
>
> _______________________________________________
> AT mailing list
> AT at lists.antique-tractor.com
> http://lists.antique-tractor.com/listinfo.cgi/at-antique-tractor.com
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.antique-tractor.com/pipermail/at-antique-tractor.com/attachments/20190920/3b163a9d/attachment.htm>