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The hardest thing about this set up in 2024? Getting the brass threaded rod. Most places have stopped carrying it. Online or in hobby shops are the only places I can find it. And it is a little hit or miss in hobby shops.

sorry but there is no way you were able to make a 50 micron 0.002" hole much less 34 with your crude needle no matter how sharp you got it, best laser have a hard time doing that even, i made pin holes not on foil but on aluminium from soda can which yes is thicker than foil but ductile for my need and the best i was able to measure was 500 to 400 microns using needle and hammer and there will be two sides with different holes sizes because of the needle cone shape and the thicker material but no way in hell your hole was 1/10 of my 500 micron , very hard to believe that because you would not even be able to see that hole looking through a lense

Is the focal length of the planar convex lens 86' ? I assume the planar convex as opposed to convex is a longer focal length ?

Ed, would you please remake a video of the safe solar projector, and include all the exact components and where to purchase the Lens and Mirror. This is the best solar projector I have ever seen. Please make another video. Thanks.

The heavier aluminum pie tins are great for pinholes. The ones that come with a frozen pie. You can make a good pin hole by pushing the needle through the tin just before it punches through, Then sand the dimple with 320-400 paper in a 'W' pattern while rotating the metal. It may take a few tries but you can get a very good result.

I am attempting optical-EME using a Celestron 4" refractor and a green laser pointer emitting less than 1000mW of power. Need to spatially filter the beam before expanding and collimating it with the telescope. Also need a bandpass filter for the 532nm emission line to suppress background illumination from the dark moon. Any DIY help with that would be appreciated.

i found it's REALY HARD to find the final "ok" for a focal ratio between my favorites eyepieces aviable or Not and the "best"exit pupils . Almost an obsession, and after many weeks of reflection i think i have found f/D ~7.62~~~😅 .this is my first pyrex 201mm~. realy nice vidéo.

A mirror will suffice.

Can I please purchase one of these projectors?

Can I purchase a projector like this? What would you recommend?

What is a payload.? Can one use a belt instead of gears? How to do calculations than?

You must get quite a workout going back and forth while tracking the sun as it moves. About how long is the image full before having to adjust the mirror?

Fantastic for fast mirrors. Luckily slow mirrors don't need it. Some houses with inside railing could allow it.

I wonder how this would work if the sun is higher up in the sky... such as at noon?

Does it matter what kind of microscope objective you use?

Hi Ed... I see that your plans refer to Herbach and Rademan synchronous motors. Upon checking their site, they offer motors starting at 1 RPH on up. What RPH should I go with?

how does the teflon tape look like?

Hello Ed, I'm asking this here in your latest video hoping that you will have a greater chance of seeing and responding to it. Please let us know how the Chief worked out from 6 years ago? And I thank you kindly for sharing your knowledge.

Thank you for sharing your talents and ideas. I would love to hear and possibly see images of how it worked out. Please elaborate?

If you apply pure bending moment to two ends of the rod, it should bend into a circular shape automatically. Just fix one end in a vise, and hold the other using a piece of strap with a clearance hole mid-length. Use two nuts to hold the rod. Don't bend, just twist around the centre of the strap.

8:30 single *mode* not single more 😉

🇹🇷🇹🇷🇹🇷🇹🇷💯💯💯💯👍👍👍👍

The problem is that I don't think many people will see any value in whatever it was that this thing accomplished. The sweet spot for inventions is to find something that people actually want, but don't have. In this case, I think that's probably more like an inexpensive way to turn the gas mower they already have into a remote controlled mower or automated mower. I suggest designing a small kit that replaces the two front wheels of a gas mower with wheels direct-driven by electric motors (no drivetrain to mess with), and use some kind of simple Arduino brain to control it (with basic software to design a route based on a known starting position). Ideally, this will use some sort of commonly available rechargeable battery packs for power tools (bonus points if it can be used with multiple brands). Essentially, you'd bolt on the new front wheels, and a brain box that has connections for the battery packs (the mower still runs on gas, but the wheels are powered by battery [independently, for turns]). The Arduino can be programmed with a route, and might use RFID pills pushed into the lawn as location references/turn directions. When you want to mow the lawn, start the engine and press the button (from the known starting position). Then go inside and have a beer. When it's done, turn the mower off, and put the battery packs in the charger, for next time. Something like this is going to hit a 'price point' much easier for people, because they already paid for a lawnmower (which still works fine). You're not designing or selling the battery packs (they can buy them separately or use ones they already own). So they're buying a kit for $199 that only takes 15 minutes to install, and they'll never have to push a mower again. THIS is what people want. They want to NOT mow their lawn. They want to drink a beer, as they look out the window, and giggle about a lawnmower that does it for them.

I keep the weeds down by cutting the grass tall. And at least twice a year let it go to seed. Would be interesting to see how this machine works.

Cool. Good luck with the patent.

Great job,thanks for keeping it simple

First of all Ed Jones: Thank you so much for a great design and a very nice how to video!! And yes, yours are VERY humbly priced. So much so, that unless you're really a DIY-er for the fun of it (of which I am) it only makes sense to order one. I'm going to have fun making one but I can pretty much guarantee that by the time I finish all the tweaks, fixes, re-dos, and what-not I'll be in it for more than If I just ordered one in the first place.. :) For those of you without Excel you can just solve for COG and round to the nearest 10th or whatever: COG = (Hota*Wota + Hrocker*Wrocker + Hplat*Wplat) / (Wota + Wplat + Wrocker) COG = (18*57+3*30.5-0.75*8)/(57+30.5+8) = 11.64

6:50 I think that;s wrong. The second part has to be convex if it spins easily. If it were concave then the outer pins would touch and the center would be free so it could not spin.

Is this a project that you are still actively making and selling? I'd be very interested in this but saw no updates or items on your website other than the write-up for this. I have been looking for a refined version of this, like yours, and am eager to try one out if you are still making and selling these.

Thank you for the video. Where can I get, or learn how to make a spherical reference?

In space year 2023, the tool might be cheaper than the plywood.

Thank you very much for the informative videos Ed. I have a 13 in mirror blank that I plan to grind and polish. What f ratio do you recommend shooting for if its gonna become a schief?

What kind of lens do you use? , have some reference measures?

This is awesome

What is the name of the song playing in the background?

Is it complete? Then how it worked we haven't seen any pictures

Amazing work I would in the future make a replica but I don't really know where to get a diffraction grating that is usable for this at a price less than 100 bucks so that brings me to the question... Where did you get the grating? thanks

Hey Ed, This looks like a really cool project. Have you made any further progress? I love your videos. Would really enjoy seeing you complete and demonstrate this project!

That is a brilliant method. Not sure it's easier than pouring pitch over the tool but it's certainly less prone to error.

Its been about 25 years since I made mirrors but if I recall, I put my lap in the freezer, then in a plastic bag, and then hit it gently with a hammer. All pitch shattered and ended up in the bag, no mess.

A question of someone from Europe: what is a threaded rod 10/24 over here? M2 perhaps?

Just to clarify the top convex optic has a longer radius if the fringes increase closer together, with pressure over the bulls-eyes? Thanks.

James Muirden's book suggests stacking several foil layers and using the pinhole from the lowest. Also the weight of the needle alone is better. Need a steady hand. Examine under high power microscope. Checking spherical mirror with eyepiece and using null lens should show perfect pinhole features. Every one hand made is a little unique.

I don't know if you are ever gonna be able to respond to this, but I have never seen a project like this before. I am very impressed. Actually I would like to build one of this for myself. But I have to ask, how did you get this lens? Where could I look for one of this? Is this from a telescope? Thank you for the video.

There are 1rpm motors, then use a 1:1 gear ratio is a optio. I found its easier to bend the rod around a tree, also gives a smoother curve, instead of the washer under the gear, use a thrust bearing.

Who plays the Banjo?

Ed, I use a tiny piece of a shadow mask from an old CRT. You just paint out the holes surrounding the one you want to leave open (using a pin and a magnifying glass) and you can get a nice pinhole that way.

What's with the website it says access denied how much are they and do you ship to Arizona state

tnx "grind parabola mirror"

Where can I find that spreadsheet you are using?