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A scratch builder of a completely different type
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 Posted: Wed Apr 24th, 2013 01:39 am
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mwiz64
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I was absolutely fascinated watching this man work. Hopefully some of you also appreciate seeing this.

http://www.youtube.com/watch?v=EzyXMEpq4qw



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 Posted: Wed Apr 24th, 2013 04:22 am
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Tramcar Trev
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Just leaves me speachless how creative some enthusiasts are......



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 Posted: Wed Apr 24th, 2013 04:39 am
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mwiz64
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Did you watch long enough to see the radio he made too? I cant imagine putting all that effort into a simple radio but then I certainly appreciated watching the process that went into it. I think guys like Alexander Graham Bell, Nikola Tesla and Thomas Edison would approve.



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 Posted: Wed Apr 24th, 2013 01:55 pm
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Herb Kephart
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One thing that I didn't see was how he sealed off the top of the tube while it was under vacuum.

Have to be an almost perfect vacuum in the tube for it to work, even if you are content with limited filament life.

Like Shultz would say--- Veeeery interesting!

Herb



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 Posted: Thu Apr 25th, 2013 12:31 am
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mwiz64
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I thought he just heated and spun the glass and as it thinned and separated it sealed it off. But I'll admit to not understanding all the steps.... Like a couple of times when he put parts into the paint can looking device.



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 Posted: Thu Apr 25th, 2013 02:48 am
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Herb Kephart
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I think that that is an electric heater. When glass is cast, as in bottles, I know that they have to be "tempered" in an oven, or else they will sometimes shatter from internal stresses a day or two after casting. I don't know if the artsey-fartsey glass blowers do this also--it may be just a precaution on his part.

Herb



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 Posted: Thu Apr 25th, 2013 04:33 am
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pipopak
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Amazing!. Obviously this guy already forgot more stuff that we all in this newsgroup collectively will ever learn. Thanks for posting!. Jose.



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 Posted: Thu Apr 25th, 2013 07:42 pm
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chasv
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amazing



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 Posted: Fri Apr 26th, 2013 12:04 am
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Tramcar Trev
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Herb Kephart wrote:
I think that that is an electric heater. When glass is cast, as in bottles, I know that they have to be "tempered" in an oven, or else they will sometimes shatter from internal stresses a day or two after casting. I don't know if the artsey-fartsey glass blowers do this also--it may be just a precaution on his part.

Herb

Yes arty farty types do this as well. I once did a course in glass blowing and I ended up making a condenser in glass.... Glass is a bit like metal in as much as it hardens where you heat it to melting point and the whole job has to be "tempered" to relieve the internal strains on it which cause cracking etc...

This Guy seems to be tooled up to make these Valves....



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 Posted: Fri Apr 26th, 2013 12:09 am
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Tramcar Trev
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You can see the tube he joins on to the top of the outer glass cylinder. He then evacuates the bizzo through that while turning it with the flame on it. May be he cheats and after evacuating it lets the valve fill with Nitrogen, argon or some other inert gas then seals it. That would give him a decent fillament life. If you recall Edison had trouble in this regard with his globes...



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I'm not a Bus, I'm a tram
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