Re: [ATM] Silicone Failure - Stop it

[Ken Hunter <atm_ken_hunter@yahoo.com>]

Hi David...

I think you were in the Air Force too???
When I was in (just after Wilbur and Orville invented
flying), the F-100 aircraft wings and skin panels were
attached to the spars with rivets *AND* a 2 part
rubberized liquid. Probably a precurser to RTV in
tubes. I lived next door and car pooled with an
Airframe Tech and we did a lot of talking about how he
afixed new pieces of aluminum to a "holed" wing etc.
Pretty interesting then and I still use the techniques
occasionally to bond things together.

(Too bad I don't have any more of that rubberized
sealer, it was pretty good at sticking to aluminum!)

Ken Hunter




--- David Harbour <scarab2@cox.net> wrote:
> Okay.
> 
> I wonder when they will try it to fit ribs on the
> main spars of airplanes
> with it, or fit mainspars on the fuselages of
> airplanes- however, let's drop
> it. "Whatever works". You guys don't need my
> permission- squeeze those
> tubes!
> 
> Dave
> 
> 
> ----- Original Message ----- 
> From: "Cary Chleborad" <Cary@Chleborads.com>
> To: <atm@atmlist.net>
> Sent: Friday, May 27, 2005 7:27 PM
> Subject: [ATM] Silicone Failure - Stop it
> 
> 
> 
> > > >He would never have used such a "faddish"
> material to mount mirrors. He
> > > >might have used it to make lap molds.
> 
> I think promoting this type of mentality is
> irresponsible.  Silicone or
> other polymer adhesives can produce excellent
> results; I'll even go so far
> as to say that in the right application superior to
> other methods.
> 
> We used a urethane polymer to glue the mirrors in
> place on the 32" scope for
> Tenagra Observatories (www.tenagraobservatories.com)
> and the system has
> lived up to all expectations.  The secondary mirror
> hangs over the primary
> purely by the adhesive with no "safety" clips.  It
> works; it has worked and
> continues to work: 6 years in the field now and not
> a hint of any failure
> issues.  The scope is sited in the Sonoran Desert
> and sees the worst of
> environmental extremes - no problem.
> 
> Like anything one must learn to use and exploit the
> properties of the
> materials at hand for maximum benefit to be
> achieved.  Even a good ole'
> manual lathe....
> 
> If one simply expects to pick up a tool and use it
> to its maximum potential
> without any learning curve or prior experience, they
> are living in a fantasy
> world.
> 
> Learn your craft, learn the tools of your craft,
> master the materials of
> your craft and you will achieve great things, even
> perfection.
> 
> 
> Nuff said....
> 
> On a more practical note... anyone have any formula
> stashed for computation
> of annealing rates of a given material??
> 
> 
> -Cary
> 
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> 
> 
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> 

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