Видео

While not a machinist all my life, you make a very valid point! Long sleeves are a no-no when operating or near machinery. A thousand apologies!

@@BasementEngineer Sorry for being harsh. That was drilled into my head for 46 years. (tool maker/pattern maker/die maker)

@@FixNewsPlease No need to apologize. "No long sleeves" is a most important safety admonition that bears repeating often, as you proved to me:-))

aho: It was described in Popular Science Monthly Magazine in 1961, and is available on-line. Note that these plans are for the basic air cooled engine only.

Toop: I really like the idea of a rocket stove for firing that engine. A little larger model would indeed run a computer and usb / phone chargers. Why not build one?

Speed of the drill is required to heat and soften the hardened metal, which is then pushed out of the way through the flutes of the drill. Coolant would be detrimental to the process.

@@BasementEngineer yeah, ok; thanks. maybe tapping would work anyway. i looked those up on amazon and didnt c them.

It's a propane burner.

No, stellite drills are used without coolant. The idea is to heat the hardened steel to the annealing point, and then scoop out the softened steel.

What are you trying to look for?

JM: Have you?

Hi, thanks for your interest. The disk magnet is magnetized on the surface that faces the coils. Further, the magnet has two poles only, diametrically opposed. It originated from a laboratory magnetic stirrer. There are different ways of building small alternators. Perusal of the many DIY windmill sites may inspire alternative solutions. Good luck!

@@BasementEngineer Much appreciated, very interesting indeed.

Please read the discussion below with robert denning.

Hello Robert! The magnet I used is magnetized across its diameter, and on one face. Thus the magnetic poles are on the face of the ring and on each end of a diameter. Methinks this magnet came from a magnetic laboratory stirrer. If you cannot find such a magnet, I would suggest gluing two button magnets on the ends of a steel bar. This has the advantage of making the length of the magnet bar suitable for the pole spacing of the coil laminations that are available. Note that the button magnets must lie between the steel bar and the laminations. For the laminations I used an old relay. You can use a small transformer and remove the windings and central leg thereof. To make a given voltage, wind a trial coil of say 10 to 20 turns and measure the voltage at the requisite rpm. Then divide the # of turns by the Volts to get turns per volts. Multiply by the required voltage to get the # of turns required for your voltage needs. w

@@BasementEngineer Thank you for this, so it is a ring magnet being used, great idea, I will give it ago.

out of curiosity what is the open voltage you are getting on this?

@@robertdenning2942 Hmmm, methinks it was 12 volts AC or so. The output goes through a bridge rectifier to make DC; a smoothing capacitor is used to reduce the ripple, and a 10 volt zener diode clamps the voltage to 10 Volts DC maximum to protect the 9 Volts portable radio.

@@BasementEngineer I have 4 coils, 40 ohm each, no metal core, just held by plastic screws, the magnets are rare earth, 4 of them, could you be so kind to send a pic of the generator you built, it seems to work much more efficiently than what I've got. I will pull lamminations from transformers i have laying around...thanks again

Thanks for your interest! You ask some very far reaching questions which would take lengthy answers. I'll point you in some directions for your further inquiry. There is a class of Stirling engines that are called "Low Temperature Difference" Stirling engines. Carefully constructed such that the mechanism has an absolute minimum of friction, these engines will run when placed on top of a cup of hot coffee. Really well-built ones will run from the warmth of the hand holding them! For energy conversion EFFICIENCY, the temperature difference between the hot end and the cooling end of the engine should be as large as possible. Search for "Carnot Cycle Efficiency" to learn more about this. Stirling engines have been built with a thermal efficiency of about 40%, which is quite phenomenal once you understand Carnot efficiency. Depending on the efficiency of the generator, one can calculated the overall conversion efficiency. A typical automotive alternator may have an efficiency of 50% or so. Permanent magnet motors, I have used windshield wiper motors for this purpose, probably have a similar efficiency when used as a generator. Purpose designed generators may have efficiencies of over 90% in large sizes. Now then, high temperature Stirling engines of efficient design are quite compact; Think of the size of automotive Diesel engines. In the 1970's automakers experimented with car Stirling engines to reduce emissions. Some of theses engines produces 150 HP or so. Finally, for a given power output, the size of the engine varies tremendously with the operating temperature difference. The auto engines were very compact because of the very high hot end temperature, plus using hydrogen gas for the internal working fluid. I've used Helium gas and it made a large difference in power output. Phillips of Eindhoven, Holland, did much development work on these engines, and published a book about its research. This book was available on-line. See if you can find it; it is a worthwhile read. Good luck with your research! Wolfgang

@@BasementEngineer Dear Wolfgang, Thank you very, very much for your replay and the "guidelines" for further researches. I should admit I'm with no engineering background, and probably a bit childish vision of how this could work. Since I sow it for first time - a one with Low Temperature Difference I imagined how these piece of kit is solving many of the problems with the clean energy supplies. Looking how a cup of tea creates the thermal energy into mechanical work I though - you only need to increase the scale, and reduce thee thermal looses, keeping a steady differences between the hot and cold plates - and voilà cheap clean energy source :) Obviously if it was so easy it would have been done already, but in many regards I see how people discard the easy solutions in pursue of the most complicated and often expensive one :)

The plans are on 25+ year old 3.5" floppy disks. Somewhere. Sorry :)

Build one! Plans are still available. w

What's a Woodford stove?

@@BasementEngineer That should read woodfired stove my spell checker on my phone changed it. Anyway that is a product the world needs 10 to 100 Watts would be great.

The power output is a little low for this: 10 Volts at .1 Amperes. A somewhat larger engine could do what you wish. w

1000 rpm to 1200 rpm, depending on the electrical load, which varies with the type of music and the volume setting. w

In principle, yes. However, the propane mass flow is so low that the cooling effect would be very small. Not worthwhile the complexity.

A rocket stove type of heater should work well. w

Thanks so much! I haven't checked this channel in a long time, but I built this engine about 24 or 25 years ago. The cylinder head has been through a couple iterations. The little booger is still here and still runs.

Not continuously! But it probably has run over 5000 hours. w

@@BasementEngineer Still.

Better than 1% is my educated guess. Once everything is hot the flame may be turned quite low with the radio still performing. w

Yes indeed! I first read about rocket stoves here on youtube, and I think it would be very suitable. w

Hi Kevin, I am happy to see that someone enjoys my meager efforts. There are a number of projects on the go in my work shop and yes there will be videos in the future. But please don't hold your breath:-)) I've had some life changing events occurring, thankfully not health related, that take up some of my time. w

To tell the truth, I never thought much about this at the design phase of this project. I built this engine from basic design sketches and then determined, experimentally, the amount of rotation required for the eccentric shaft. Then I made the brass button to provide for the correct amount of rotation. Yes it is possible to determine this prior to construction, especially with CAD drawings that permit the running of the CAD model, programs such as FUSION 360. w

@@BasementEngineer Hello, nice to hear from you. I am very impressed by your engine. I did install Maudslay reversing gears on two of my miniature three cylinder engines. One with two gears and one with four gears. There are videos of them on my RUclips channel at LeslieProper . I would be interested in your comment on them.