[Robotgroup] hostile enviro

[Bill Craig]

Teflon is always good.

On Jan 10, 2008 2:09 PM, brooksdesign <brooksdesign at peoplepc.com> wrote:

>  I had a bunch of 8inch stainless tube that got recycled in the big move
> but I was just told someone under bid us on that part of the job anyway so
> now I just have to design a robot arm that repositions the test fixture on
> the shaker portion of the test. So many all night cad sessions my eyes are
> starting to get coordinate grids etched into them.
> -brooks
>
> -----Original Message-----
> >From: Def Egge <robodigest at innervate.com>
> >Sent: Jan 10, 2008 12:30 PM
> >To: The Robot Group Mailing List <robotgroup at puremagic.com>
> >Subject: Re: [Robotgroup] hostile enviro
> >
> >My reading of "freezing water" was more figurative than literal but,
> >just in case, friction-fitted "freeze plugs" are the automotive
> >solution to preventing ice from cracking cast-iron engine blocks.
> >
> >If corrosion of the cast-iron is a problem, fresh antifreeze contains
> >a number of corrosion inhibitors in addition to the ethylene
> >glycol.  Of course, ethylene glycol may introduce a different set of
> >problems.
> >
> >Depending upon the size of the sensor / housing, I'd used 'recycled'
> >nitrogen gas tanks [rated well in excess of 3000 psi] .... cut the
> >canister, weld flanges to both parts of the canister, bolt them
> >together with an appropriate gasket between the flanges, and you have
> >a reasonable facsimile of a 'pressure chamber'.  Keeps hot food hot
> >and cold foods cold ... but how does it know?  ;-)
> >
> >A resourceful dude like you could probably locate a segment of
> >stainless steel pipe & a pair of flanges and fashion a chamber to
> >withstand whatever pressure you anticipate.
> >
> >
> >Good luck, Brooks.
> >
> >Mike
> >
> >
> >At 10:59  2008-01-10, you wrote:
> >-=-=-=-=-= begin quoted message =-=-=-=-=-
> > >I've seen PVC used around hot, cold and salt water. I doubt it'll
> >hold
> > >up to
> > >freezing water under any pressure though.
> > >
> > >We used stainless "containment vessels" for extreme testing in a
> > >previous
> > >career, but again freezing water under pressure will create
> >problems.
> > >
> > >Simple version might be a cast iron pot. They have sloped sides
> >from
> > >the
> > >casting process, so ice should "rise" in the pot rather than
> >creating
> > >enough
> > >sideways pressure to crack it.
> > >
> > >Paul
> > >
> > >On Jan 10, 2008 10:52 AM, brooksdesign <brooksdesign at peoplepc.com>
> > >wrote:
> > >
> > >>  Hey industrial kids,
> > >>  do any of you have any experience with matireals for hostile
> > >enviroments
> > >> like hot/cold salt water and oil? I'm designing a torture chamber
> >
> > >for some
> > >> automotive sensors so it needs to be able to handle boiling and
> > >freezing
> > >> water.
> > >> -brooks
> > >>
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