GIGANTIC Solar Fresnel Lens 64" spot Solar concrete crusher can melting with a solar scorcher 

I;m a little over 66 yrs old and been watching your experiments and building projects. You and your wife really do a good job. thanks

Amazing how something can be so cool and so hot at the same time.

You two have such fun, and provide a real-life educational experience with these posts. Thanks so much. I've turned some friends onto you guys and they have taken some of the things they've learned to orphanages in South Africa to help there. Heart in hand, you are good people.

Sink in water for 1 hour. Remove and allow to dry for 24 hrs. Then you can place in the sun to dry. The water anneals (sort of annealing usually refers to heat) the cement allowing slower cure time and a better cross linked structure preventing tiny cracks/fissures. Bubble holes can be filled with cement. Wet the bowl first prior to smoothing layer as this provides better adhesion. 24 hours is fine if your mixture was perfect. Most add too much water. Depends on humidity and weather.

I love your videos. Not just instructional, but interesting and funny. You should put bloopers at the end of your videos, just for fun.

Dan that is hot as hell! You could melt bronze with that. That is one heck of heater.

I agree. This setup begs application. Casting the aluminum cans you find on the streets into something pretty and useful would be awesome. And a lava rock casted in the shape of a statue, wouldn't that be kinda novel? You might do a small one in one go, and a larger one by just topping the mold off bit by bit. Dan, I applaud your work and video editing quality. Awesome filters. Glad to subscribe.

This kind of video always brings out the kid in me.

Hi, Pure portland cement vs adding sand creates a stone like structure vs cement deck. Builders mix because of cost and also decks should have rough surface for wet no slip etc. The lower the sand to cement mix the higher the strength rating. Bowls are small volume so one 80lb bag can make many. Cement is endothermic when hardening. once the molded material is firm (cure in the shade higher humidity) about 36hrs. spray with water. After 72 hours fill with water or sink in water.

You could make an array of small mirrors to guide that ray to pretty much anything. or a tube with reflective interior.

so pritty yet so devestating. I need to start experimenting with fresnel lenses at some point.

How can I get a fresnel lens 64" like yours? I would like to use it to desalinate salty water near ecuatorial line at Sechura desert in Peru, where you can have almost 365 sunny days a year.

would love to see your FRESNEL LENS 64 melt a natural rock or burn a hole through it, pretty cool stuff

i'm gonna use this simple tech to make steam and electricity - i have been planning it for a while - love your channel - your like Mr.science -

Casio EX-F1 3 years ago they were $900 new, now they are $2,500 new. I should have bought a few:-)

I would love to see one of these pointed at a large metal block with water channels through it. It would be nice to see how effectively you can heat a large volume of water with it.

Arsenic hardened bronze wire pulled taught using quartz sand as an abrasive. The split using water or vinegar on wooden wedges which swell. The techniques have been duplicated and even works on granite.

You should build a frame for it and run water though the heat to run a small steam engine!

HAve you ever made your own fresnel lens? I was thinking of buying a sheet of clear plexi and use a router or dremal to carve a spiral from the middle out. Clean excess plastic shards and dust. Take a hand torch and hit the plexi just enough to remove cloudy or matte finishes without melting or discoloring the plexi. Hopefully this creates a fresnel.

Very cool slow Mo :) Comet styles!!

You can make a crucible out of metal from a empty CO2 catride/tanek, just take a hacksaw to the top of it.

check out his other videos friend! There is lots of info about the science behind everything in these shows, especially related to solar power and how it can be used to transform your home into a self sufficient, green powered home you can make money from!

Closer is better vs further away. The spot/concentration diameter is the same x" before optimal x" after optimal BUT the pre-focal point is better as the light has less debris distortion. watch?v=TYoc_V4_6iE

I used to enjoy baking our driveway with a large fresnel lens. It got so hot that ants would come out from way deep below and scram.

Okay, yeah nice cam. I was looking at that exact model, cant afford it! Keep posting more!

What eye protection do you use when looking at the melt pool? Will a welding mask at shade 13 be ok?

entertaining but wheres the science part of your show, eg. how useful is the amount of heat created to convert to power. My question also applies to your trough mirror video, it 'looks' like a good idea and is obviously a cheaper solution to solar panels but what would be the power made when transferring it to a steam motor for example next to a solar array taking up the same amount of space make?

Interesting, I doubt gazing into that bright spot is nutritious for your naked eyes. I would even be concerned about my camera sensor. Could you do a back of the envelope calculation how many watts sun delivers on the spot. Maybe if we new the color temperature of molten aluminum and the boltzmann dist of it we could guesstimate. But there are simply too many variables to factor, ambient air the concrete soaking some energy due to chemical reactions etc. I am looking forward for an answer Thanks

love the slow motion and sound, it's actually relaxing to close your eyes and listen, anyhow,, I've been watching some of your lens videos, I saw some last year but was building turbines so my interests were different at the time, now I'm curious, what is the reason for the drilled holes in the lenses? when you get a moment can you point me to any info or vids that explain this?

Just a quick warning to others about melting aluminum cans (soda, beer, etc). Don't breath the fumes! Pretty sure Dan was upwind of the can when he was doing the melting, since he's a smart guy. There's all kinds of nasty chemicals that get released when the paint on the cans is burned. Same warning goes for if you're melting down cans in a furnace. Stand back when you first put the cans in. After they melt down, the paint residue floats to the top as dross and should be skimmed off.

So many rainbows!

Cool! What camera do you use for your slow motion? Im assuming its a high FPS recording slowed down to show that detail... Thanks for posting!

I realy like your video's. Will the Fresnel Lens cut though rock?

Can't wait to see this

Think you could use a smaller fresnel lens to heat a foil dinner for camping?

Hey Dan, could you try using a crucible like the guys who run the forges do? Collecting solar energy is getting pretty easy by a number of methods but no one has shown how to combine known forging/crucible techniques and solar oven techniques...A thought.

Have you tried welding with this Fresnel Lens yet Dan?

Very cool stuff!

Iboughtt a Sony 52 inch rear project or tv and took out what I thought was going to be a Fresnel lens, but it turned out to be a nice piece of plastic and a tented lens but no Fresnel lens. What type of rear projector tvs have real Fresnel lenses?

A max temperature above 3000f. I'm wondering if that can melt iron.

I need a help. I want to design a concentrator which could produce a high i mean very temperature like 1000 deg C, Will this freslen lens withstand ??

Fresnel lenses normally focuses light on one spot with rounded Fresnel tracks. I've been looking for a lens with elongated tracks that can focus light on the length of a pipe but cant find any. Do you have an idea.

Have you tried diorite rock for this experiment? It'd be nice to know if this is the method used in the constructions of the Andes Mountains or at Pumapunku.

@GREENPOWERSCIENCE Can you try melting sand into a brick with this lens?

Plastic?

u guys should start "blacksmithing"with that "tech"

:-) Thank you for the nice comment. Let me know if they need any help.

Thanks for the information, just seen them videos pretty smart!!!

Did you use a filter to protect your camera lens?

How does the cement look after cooling???

No offense Moses, but who needs the Arc of the Covenant when you have Danny Boy's Fresnel Lens?

But will it melt a Pre 1982 Penny which is 95% Copper?

thanks for another great vid

is the exploding concrete able to damage the lens?

May not be useful for welding, but sure seems like it could be useful for soldering...

Need a 15 foot spot lens to melt large amounts of glass to make marbles

Could you make your own wires with the molten cans?

he probably means the plastic lining in the soda can.

Oh! Try using a fresnel lens to get a steam engine going! Or a steam turbine.

more info area, our website:-)

This may be how the egyptians split the stones of the pyramids. they are 100% straight cuts with no "tool marks"

HOT BOILING MOLTEN LAVA?!??!!

I could only get my lense just over 600 f or just over 300 c

Fireworks!

Wats a concretecrusher can?

So when our sun expands at the end of its life... all the rocks on the planet will be doing what's happening at 3:38... scary stuff.

Hmmm gives me some idea's:)

Haha, greenpower guy made you the pudden-head LOL

LAVA AT 00:32 !!! Oh Crap !

vids are epic keep it up :)

I once cut a can in half with my lens

dont breathe that shit brother!!

>_> generate some electricity with all that heat!!!!!

Thank you:-) YT search "3002ºF DIY Lava Obsidian FARMING Melts Rock with Sunlight 1650C Solar Fresnel Lens minecraft" or watch?v=svAPyyUJUCo

ok i admit thats dangerous !! very dangerous; if i had this at home i wouldlove to creat things with molten glass; maybe some lenses; or surely melt steel or aluminum and creat little swors for decor :: many things can be done, but i have no way of gettig this big ass lens !!!

I will start burning pennies and selling them for copper

Info on this and other lenses are on our website. greenpowerscience.com

watch?v=4MhCYJqkgh8