Wasn't that the surgical team that invented jet propulsion?
I suspect the story was apocryphal as the victim would have been
well-enemaed prior to the operation, leaving no organic matter in the
colon to anaerobically decompose.
I believe the usual term is enteric emissions even though exitic would
seem more appropriate!
Brian
Bev Christian wrote:
> I would be careful with the latter use of a soldering iron! A well
> known gastro-intestinal specialist came to the medical school at the
> University of Toronto and gave a very enlightening presentation on
> farts. (He generally called them anal emissions.) He said there was
> one case where they had been doing surgery in that general area and the
> anesthetised patient passed gas as they went to cauterize and the
> resulting explosion blew the surgeons back against the wall and tore a 5
> inch gash in the poor fellow's large intestine. They had to do
> emergency surgery and the guy woke up a tad sorer than he expected.
>
> I read this in the Canadian edition of Time Magazine and it made such an
> impression on me I have never forgotten it.
> Bev
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Stadem, Richard D.
> Sent: Wednesday, May 23, 2007 8:38 AM
> To: [log in to unmask]
> Subject: Re: [TN] Flux residue, burnt flux
>
> Quite often, the small amounts of burnt flux or other particulates are
> from using the solder irons to perform operations they were not intended
> to do, such as shrinking tubing on wires, conformal coat removal, epoxy
> removal, performing artistic designs in wood while the boss is not
> looking, hemmorhoid removal........
>
> -----Original Message-----
> From: TechNet [mailto:[log in to unmask]] On Behalf Of Brian Ellis
> Sent: Wednesday, May 23, 2007 2:38 AM
> To: [log in to unmask]
> Subject: Re: [TN] Flux residue, burnt flux
>
> I'm sure that an eminent co-contributor to this forum will tell you, "it
> depends". If the flux is truly burnt, i.e., black, this indicates
> pyrolysis, which is a fancy word meaning decomposed by heat. Pyrolysis
> indicates that the residues have split apart into numerous compounds,
> leaving carbon-rich stuff. Elemental carbon can be an electrical
> conductor; do you want conducting particles in your assembly? They may
> appear fixed in place now, but will they remain so during the life of
> the equipment?
>
> More important, WHY are they there? It may be because the operators
> don't keep the bits of their irons clean. Do they wipe them on a wet
> sponge before each joint is made? It may be that the time/temperature
> conditions of the joint being made are far from optimal. It may be lack
> of adequate training of the operators. I can't tell. Whatever,
> prevention is better than cure; a lttle research into the causes may
> give you the answer.
>
> As to flux flow, maybe your solder wire simply has too much flux. Some
> manufacturers allow you to choose the percentage. Yes, it is easier to
> solder with an excess. It's a compromise.
>
> What you have not told us is the essential information: what kind of
> assemblies are you making. You can obviously be more tolerant of
> imperfections if you are making toys than if you are making inertial
> guidance or satellite systems. Probably you are somewhere between thes
> extremes. "It depends"!
>
> Brian
>
> Sue Powers-hartman wrote:
>> We fight a constant battle with operators leaving burnt flux in
>> joints. Maybe only a small speck, but drives the inspectors nuts. The
>
>> way I read JStd-001D, if they can not see it at referee inspection
> power, they have to accept it.
>> How dangerous is this burnt flux to the PWB? If it's not seen at
>> inspection power and left on the board, what happens. Also, what
> about no clean flux?
>> Our solder training video says that if no clean flux runs out to far
>> and is not heat activated, it can cause problems. Operators watch this
>
>> video, but somehow do not get this. They say that it's no clean, they
> can leave it all on.
>> I keep saying that this can be a problem, and then they ask me, how
>> far out can the flux be away from the joint before it's unacceptable.
>>
>> Wow, I'm glad I found this forum, I have so many questions to ask you
> guys.
>> Anyway, thanks for the help on this subject.
>>
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