#61
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More progress on the oven, though it still isn't finished. I bought some high temperature caulk (good to 750 deg C.) and sealed all the joints between the steel and frame on the inside of the oven. The caulk hardens like clay.
I was able to get the oven to 700 deg F, which is about what we need. However, when the oven had cooled down a good deal of the caulk had separated from the metal and fallen onto the floor of the oven. This is because of warping of the steel that occurs when it reaches a high temperature. I have the steel attached to the frame with bolts spaced 12-18 inches apart. By putting additional bolts along each edge of the steel I think I can contain the warping and that the caulk will stay in place. |
#62
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I'm very glad to hear all the progress reports.. It seems like everything is falling into place.. A few years ago many were worried if it will ever happen, and now we are most certain it will..
__________________
Looking for an all tube or hybrid color TV set from the late 1960s, early 1970s that's in a steal cabinet.. |
#63
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I worry about the mixed units. Didn't a space mission once fail because one part of the team was working in metric units while another was in feet and inches..
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#64
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Quite a few space missions have ended in failure for this type of reason. To my knowledge the Hubble is the only one to have overcome it. Everything else crashed and burned.
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#65
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Quote:
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Audiokarma |
#66
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For Hubble, I'm assuming you're meaning the lens sag issue because they forgot to account for gravity bending the lens while it was sitting on Earth pre-launch? |
#67
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The Hubble problem was idiotic stupid pigheaded project leaders. There were two different test devices used to measure it. One, the simpler one, correctly said that it was exactly as it was: very very wrong. The more complicated, expensive one, was simply wrong. No one ever checked either test device. No one did a trivial by-eye test that would have verified which was right, for two reasons: 1) that doing so required a human to climb a scaffold and that was deemed both too dangerous and too expensive (building the scaffold, the by-eye test apparatus was free ... several workers personally owned one, as do I). 2) the idiots said that the by-eye test was not sensitive enough to detect any possible error. That was, however, assuming that their already-decided idea that the complicated tester was right was indeed correct: they knew that the by-eye test would be sensitive enough to tell which tester was correct. |
#68
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drussell, yes I can put caulk between the steel sheets and the frame. However, the stuff cures like clay and probably wouldn't provide much of a seal.
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#69
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Maybe you need to forget the calking and go to overlaping strips of sheet steel like
corner molding not tied to the larger sheets so they can all expand and contract without warping. Maybe tied to the frame, and rasting on the larger sheets inside the oven, possibly made of several layers covering the area fully, but not a single piece end to end so expansion will not cause it to warp. .
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Yes you can call me "Squirrel boy" Last edited by Username1; 10-17-2014 at 06:53 AM. |
#70
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Your other option is to widen the gaps somehow, and "caulk" them with stove gasket. Caulk here is used in the original nautical term of shoving greased rope in between the decking boards with a mallet and tamping tool, not the modern stuff that comes out of a tube. |
Audiokarma |
#71
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Success with the oven. By using lots of bolts to attach the steel to the frame I was able to seal it well enough to get up to 700 deg F in about 2 hours. To improve this, I'll get some stove gasket material and put it between the steel and the frame.
The next issue is the controller. It doesn't work, and I think I may have damaged it by applying 120 vac to the wrong terminals. I might have to buy another one. |
#72
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#73
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#74
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1948 dumont WOW
Hi,
im just looking to find some info from some people who know what there talking about, I have what I believe to be a 1948 Dumont large screen tv, radio,and phonograph all in one mahogany entertainment center. The TV comes up in middle( very cool ) the unit is large approx. 5ft wide 4ft tall. from what info I do have is this was a high end unit back then. If anyone can point me in the right direction or any help please contact me 516-707-3686 thank you Rob also have other small units ( help ) hate to see history go to waste Last edited by dadsoldstuff; 10-23-2014 at 02:53 PM. |
#75
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thanks again
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Audiokarma |
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