New plans added on 11/25: Click here for 2,597 plans for homemade tools.
baja (Sep 17, 2022), Inner (Sep 16, 2022), johncg (Sep 18, 2022), mwmkravchenko (Sep 16, 2022), nova_robotics (Sep 16, 2022), Ralphxyz (Sep 16, 2022), Scotsman Hosie (Oct 1, 2022)
nova_robotics (Sep 16, 2022), rdarrylb (Sep 17, 2022), Scotsman Hosie (Oct 1, 2022), smittman (Apr 5, 2024)
A few years ago I welded up a frame and put a Fresnel lens in it. I bought that lens online, but you can get them for cheap/free out of old projection TVs which everyone seems to be throwing out these days. This picture is my girlfriend using the Fresnel lens to melt sand into glass. It would melt the sand pretty quick. Very impressive stuff.
Altair (Sep 17, 2022), mwmkravchenko (Sep 17, 2022), rdarrylb (Sep 17, 2022), Scotsman Hosie (Oct 1, 2022)
On a sunny day, if he lets it boil dry he could possibly destroy that pot with that parabolic dish.
Back in the 1980's as part of an energy unit I had a class build a 4' diameter parabolic reflector from fiberglass and epoxy resin. The form was made from plaster using the jiggering method to create the parabolic shape. It was in 8 sections, bolted together to create the full dish.
The sections were covered with strips of chrome mylar we got from a parent that had a connection with Dupont. We were only able to try it one time as the intensity of the light at the was so intense to be dangerous to the eyes. It was as bright as arc welding. Holding a common 2 x 4 at the focal point would begin to smoke instantly and burst into flames in just a couple of seconds.
I wish I had pictures.
Last edited by hemmjo; Sep 18, 2022 at 03:01 AM.
mwmkravchenko (Sep 19, 2022), Scotsman Hosie (Oct 1, 2022)
Ralphxyz (Apr 8, 2024)
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