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Re: Annealing ovens
Thanks again !
Alan
protek@shreve.net wrote:
> Alan,
> The one I built was out of an available piece of aluminum channel maybe
> 8 inches wide and 12 inches high. I used another smaller channel to
> complete the cycle of air flow. It would not be difficult to build a
> larger oven that would allow many more to be run at the same time. I
> could run two probably. I figured that the main thing here is to have each
> part of the window, all surfaces at the same temperature. That is why I
> used the fan. It is a flue (Sp?) fan. Grainger sells it to put inline
> with heater exaust etc. It can take the heat. I used a resistive element
> connected to a relay. The relay was part of what is commonly called a
> "Bang Bang" system. It is on and off. I wrote a BASIC program that with
> some sensing knew the temperature and would cycle the relay. I got fancy
> with it. I anticipated the temperature and compensated for the lag in
> heating and cooling. I do not think this is necessary though. I just
> placed the window in the vertical plane in a bracket that kept it stationary.
>
> Gary
>
> At 10:48 PM 3/1/99 -0800, you wrote:
> >Gary,
> >
> >How difficult do you think it would be to build one that will run, oh.. 6
> at a time
> >?
> >What does the port sit on ?
> >
> >Anyone else have a design ?
> >
> >I really do have to make one, I have 16 ports to anneal !!! and that's
> just this
> >sub.
> >When Subview one is complete, I am going to use the experience gained to
> build
> >Subview 2. This a little more than just a hobby, I'm working toward
> building a
> >certified sub.
> >I do not intend to die with my dreams still inside me nor die inside my
> dream on the
> >same token.
> >
> >Any and all info and help greatly appreciated.
> >
> >Alan Long
> >Subview
> >
> >Alan Long wrote:
> >
> >> Hi Gary,
> >>
> >> I take it that you are using the chart on page 284 ?
> >> I believe the use of a safety factor of 5 is from A.B.S.
> >> Thanks for pointing this out.
> >>
> >> protek@shreve.net wrote:
> >>
> >> > I just looked up the short term critical loading failure
> prediction for
> >> > the window you mentioned and it is right at 725 PSI from the chart in
> >> > Stachiw's book. It recommended you use a factor of 8. I built my
> >> > annealing oven with a closed loop of aluminum with a high temp blower
> >> > purchased from Grainger. I packed the whole assembly in a plywood
> (UhOh!)
> >> > box with a lot of fiberglass insulation backed around it. I have a
> >> > resistive heater in the channel with a location where I can place the
> >> > window inside the channel. The circulating air keeps the temp constant.
> >> > Stachiw's book has the numbers for annealing. You need two cycles. I
> used
> >> > a computer to monitor the temps and control the heating. It took a
> full 10
> >> > hours to run one window.
> >> >
> >> > Gary B.
> >> >
> >> > At 09:05 PM 3/1/99 -0800, you wrote:
> >> > >Hello again Jon,
> >> > >
> >> > >Well maybe it wasn't as load as it seemed, you see, this was my first
> >> > destruction
> >> > >test and I was exited and not sure what to expect,
> >> > >it took me by surprise! It sure did seem load... anyway...
> >> > >
> >> > >The "bang" was just the port.
> >> > >The test chamber is about 3 ft in length and 18 in. dia.. It belongs
> to my
> >> > friend
> >> > >Doug Previtt of Delta Oceanographics.
> >> > >I feel very lucky to have access to his facilities, He is a very nice
> guy.
> >> > He
> >> > >has been building subs (about 7 or 8) for over 35 years.
> >> > >His sub, the Delta has over 4000 dives all over the world with a perfect
> >> > safety
> >> > >record. He has dove for many government agencies and institutions, and
> >> > on, and
> >> > >on, and on... I think you get the idea.
> >> > >
> >> > >When I was a kid my hero was Clint Eastwood.
> >> > >As an adult... sorry clint, doug has you beat !
> >> > >He has done in his life what I am just beginning.
> >> > >
> >> > >Sorry, back to the subject.
> >> > >
> >> > >The view port I was testing was a flat, acrylic disc, 1 in. thick, flat
> >> > bearing
> >> > >surface flange, I.D. of 6 in, O.D. of 8. this of coarse gives me a DO/DI
> >> > ratio of
> >> > >1.333 which is above the minimum 1.25 acceptable. I needed the port to
> >> > maintain
> >> > >to 675 psi to get my safety factor of 5 and it blew at 760 psi which
> puts the
> >> > >depth at 1707 ft. My operating depth goal is 300 ft. so I'm in the
> green !.
> >> > >Oh yeah, the port I tested was not even annealed, even better because
> the
> >> > ports I
> >> > >use will be.
> >> > >
> >> > >Do you know anything about how to make a good port annealing oven ?
> >> > >ttyl
> >> > >Alan Long
> >> > >Subview
> >> > >Jonathan Shawl wrote:
> >> > >
> >> > >> Alan Long wrote:
> >> > >>
> >> > >> > Jon,
> >> > >> >
> >> > >> > Of coarse the chamber was water filled !
> >> > >> > What did I say that made you feel I was using air ???
> >> > >> > >It sounded like a gun shot !!!
> >> > >>
> >> > >> I didn't think it would be that loud if it was a small water filled
> test
> >> > rig.
> >> > >> I guess I made an assumption, sorry about that.
> >> > >> Was the bang just from the cracking or exploding plastic view port?
> >> > >> How big was the water filled chamber? volume?
> >> > >> How big was the lens?
> >> > >
> >> > >
> >
> >