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 Post subject: Solar Scorcher for smelting small amounts of metal?
PostPosted: Sat Mar 09, 2013 1:33 pm 
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Joined: Sun Feb 26, 2012 12:51 am
Posts: 9
Apparently you can pull gigantic Fresnel lenses out of old rear-projection TVs. So I'm thinking - Gigantic solar death ray + Crucible + some fire-brick = A now power, no gas, no coal option for casting small amounts of metal - jewelry and small parts.

There are three rear-projection TVs in the freebies section of Craigslist just today, so the materials are definitely there. A tenative parts list would be

Scorcher
- 2x2s and 2x4s for the frame
- Gigantofuckinghuge Fresnel Lens
- Some kind of locking pivots to allow the lens to be adjusted to the right orientation relative to the sun

Burny stand thing
- 2x4s to build a frame
- Alternately - weld up a steel frame, though that's beyond my skill set
- Fire-brick to form a relatively heat resistant surface
- Crucible

If I had a truck and another set of hands I would totally be up for grabbing one of these things, taking it apart, and setting things on fire this afternoon. Alas, no truck.


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 Post subject: Re: Solar Scorcher for smelting small amounts of metal?
PostPosted: Tue Mar 12, 2013 1:25 pm 
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Joined: Sun Mar 15, 2009 9:10 am
Posts: 96
Location: Golden Valley
Great idea. I'd love to see how hot it could get and the amount of material you could melt. If nothing else you'd make a nice solar cooker. Add a solar tracker and you're set.

I've seen the insides of some rear projection TVs but I only recall seeing large mirrors, no fresnel lenses. I wasn't looking for a fresnel lense and could have missed it, or it could be a specific model that uses them.

I have a truck and would be willing to lend a hand in procuring a TV and working on making a solar smelter. I wish I would have seen your post earlier.

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You can't have Success without the suck.

Too many irons, not enough fire.


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