/diy/ - Do It Yourself

>>195845
The lens on the rear projection TV was right up against the front panel. When using it, make sure the side with the ridges is facing your light source. It works far better that way. Also, never carry it while standing on the shadow side. Always have the lens in YOUR shadow, otherwise you will literally set yourself on fire instantly.

You can see here what one can do to a penny in about 5-8 seconds.

An ex-coworker gave me a super fuzzy rear projection TV. Inside I scored tons of components including 3 really nice 3.5" lens and a 28"x33" Fresnel lens. I just got around to making a wooden frame for the lens. The next step is to make a holder and stand for it so I can turn it on both axis. That way alignment, with the sun, will be perfect. However, I couldn't resist testing it out with the new frame.

I took a penny, painted it black on one side with a marker, and set it on a rock. I aligned the Fresnel lens with the sun and nearly vaporized the penny. Had the zinc not run away at an angle it would have vaporized it. the copper coating was vaporized. I also scarred the rock with it and it popped and chipped away in the heat. This thing lights wood on fire instantly and chars it to nothing. In order to even use this I have to wear a welding helmet and look through dark lens. Otherwise, it would blind me like a welder.

Video of the carnage, too bad you can't see anything for the massive blinding light,
>35.61MB - no audio
>DSCN9576-1.m4v
http://www.mediafire.com/?syf0x5e5oyrcl0a

I really would like to try melting small amounts of metal with this and casting something small.