29
Nov
GREENPOWERSCIENCE© MAKE A PARABOLIC MIRROR CUT A CIRCLE SAW
Posted By admin in Woodworking
CUTTING A PERFECT CIRCLE ON A TABLE SAW. MAKE A PARABOLIC MIRROR COPYING A PARABOLOID. MAKE PERFECTLY BALANCED FLYWHEELS OUT OF WOOD. THIS METHOD FINDS THE PERFECT CENTER WITH NO MEASURING. THE SAFE WAY TO CUT A PERFECT CIRCLE ON A TABLE SAW.
Duration : 0:6:39 Views : 6954.
November 29th, 2007 at 6:51 pm
Wow, you are good …
Wow, you are good at wood working too. Simply Amazing. That is neat. So the hole is always in the perfect center. Noticed how well the wooden wheel spun. That cut you did would take about 10 min on a ban saw. GOOD VIDEO THANK FOR THE IDEA!
November 29th, 2007 at 7:39 pm
HI,
Yes because …
HI,
Yes because the bolt is the turning point, it will always be the center. Balancing the wooden wheels for flywheels is easy since you know your wood is centered. The big 23 inch circle in the opener took only took 5 minutes to cut from start to finish. NO PENCIL MARKS:-)
November 30th, 2007 at 12:46 am
Once again I’m …
Once again I’m amazed how things seemed to be easily done when you got all those modern and efficient tools as you had. I’m from a third-world country, Madagascar (the Island, not the movie) and it’s pretty hard to use tools like your saw-table. Nevertheless I do recognize I could achieve the same goal (almost) using very basic tools as a manual saw. Thanks a lot. I do appreciate your contribution to a better world!
November 30th, 2007 at 8:39 am
Thats outstanding …
Thats outstanding Dan.
If you keep going like this I’m going to able to have my own version of the Spanish solar power station in no time.
Can’t wait till episode 3.
November 30th, 2007 at 6:02 pm
Wait wait wait–I …
Wait wait wait–I can buy sheets of plexiglass mirror? And form them in the oven?
Where?
I can make a cylindrical parabolic mirror like this!
December 1st, 2007 at 7:09 am
For a trough Mirror …
For a trough Mirror it is EASY. I will post a DIY on that next week. The mirror is PLEXI Glass - AKA Acrylic. Plexi is a brand name like Coke or Pepsi. Most people know “Plexi”. Look for Acrylic Mirrors. Most plastic companies sell 4′ x 8′ sheets for $70-$100.
December 1st, 2007 at 7:10 am
Smaller 4×4 sheets …
Smaller 4×4 sheets are $25-$30. You can use several large regular mirrors bathroom etc focused on the back of the acrylic mirror and it can be shaped easily. This is great for forming large trough Acrylic mirrors as you do not need a Giant Oven.
December 1st, 2007 at 8:20 am
dude you’re a …
dude you’re a genius! cutting plexi with a jigsaw is a nightmare
December 1st, 2007 at 9:35 am
That’s weird–I …
That’s weird–I thought I posted a comment with a link to a pretty low priced place.
Anyway, I’m looking forward to the trough. I’m trying to think of some good way to get a parabolic form to shape to and the best I can think of is just “cut really carefully”.
December 1st, 2007 at 12:26 pm
Very cool. How …
Very cool. How thick of wood dose it work with? I tried it with 3/4″ plywood and it took 15 turns but the circle was perfect WOW THANKS A LOT!
December 1st, 2007 at 4:28 pm
Use a large barrel …
Use a large barrel or tank for short troughs. For larger wider ones, bend a thin sheet 1/4″ of plywood to the curve and lock in place (many ways to do it). Put the acrylic mirror side down and heat the back with multi mirrors or a hairdryer. Please email me the link and I will pass it on.
December 1st, 2007 at 4:55 pm
That would be a …
That would be a circular arc. I’ll have to do the math (or an experiment) to see if that’s close enough.
December 1st, 2007 at 10:15 pm
i’m sure a lot of …
i’m sure a lot of people will be very happy with this information on howto make their own parabolic mirrors.
Good work guys!
December 2nd, 2007 at 6:30 am
Hi,
I have cut a 2″ …
Hi,
I have cut a 2″ thick x 36″ Diameter before. Thicker boards work best with larger circles. The smallest you can safely cut of any thickness with this method is 10″ to 12″ Diameter. If you choose to cut a smaller circle, USE A LARGER BOARD 20″x20″ to cut the small circle. This way your fingers NEVER VIOLATE the 1 foot rule of the saw blade. Better to waste wood than fingers. BE SAFE.
January 31st, 2008 at 4:51 am
Another fantastic …
Another fantastic video.
Thanks
Jack
January 31st, 2008 at 6:38 pm
very nice idea
i … 
i need this for my concentrator 
thanks
very nice idea
February 1st, 2008 at 12:30 pm
YOU ARE VERY …
YOU ARE VERY WELCOME!!!
February 7th, 2008 at 12:45 pm
the only problem …
the only problem will be finding a *parabolic* shaped lid.
i got a question: can you use the same glass lid to shape another mirror? i mean does the plastic mirror get stuck to the glass?
thanks for the great video!
February 8th, 2008 at 5:59 am
YES to reuse the …
YES to reuse the glass. It does not get stuck. Now that you mention it, I should have shown the removal process. Once it cools, it falls out. Yard sales are great. Also old water tanks have paraboloids on the bottom. Also you can copy any paraboloid with cement, I will have a video soon of that.
February 8th, 2008 at 8:27 am
i’ve made a …
i’ve made a parabolic pattern out of plaster and coated it with varnish, for protection. i just took 3 pics of it, i posted the URLs for the images in my profile’s description (since URLs are not allowed in comments).
i haven’t had enough time lately to work on that, but next i’ll make a housing for an accurately placed vertical axis, which will be
used to turn the pattern and shape a parabolic plaster mold.
your videos will be very useful for me to proceed! thanks a lot, man!
February 8th, 2008 at 9:09 am
YouTube was …
YouTube was snapping the links, so i posted a single link for the pics in the “Website” field in my profile. now it’s working.
February 8th, 2008 at 4:02 pm
VERY NICE!!!! Keep …
VERY NICE!!!! Keep me updated on your progress!!!
February 21st, 2008 at 1:32 am
wow shes so …
wow shes so beautiful love her black hair smart chick
February 21st, 2008 at 6:03 am
Hi, thank you for …
Hi, thank you for the great comment, “My First Youtube Fan Mail”……Denise