Products > Dodgy Technology
Davids Perpetual Motion Machine
jonovid:
the name David Jones got my attention.
this Perpetual Motion Machine is another bit of dubious kit.
looks like a quartz movement, that can run for one to two years before needing a battery change.
The creation of the late British scientist and author David Jones.
Adam Savage video.
link
https://royalsociety.org/blog/2018/09/perpetual-motion/
I believe our Dave can do better then this!
something for the lab, maybe. besides ultrasonic gas leak detector clock.
Cyberdragon:
Not a quartz clock, there's no connection between the wheel and anything besides a couple bearings. The general consensus is it's electromagnetic, like one of those spinning top/whatever toys. The magnets are on the wheel rim and the coils are in the beams. The battery is either in the frame or one of those boxes and the rest is fluff/decorative.
wilfred:
What's dodgy about this machine?
Anyway there is also this video where the present owner discusses it.
Also there is this article in the April 1989 issue of Electronics and Wireless World which has an article on the ball bearing motor.
https://worldradiohistory.com/UK/Wireless-World/80s/Wireless-World-1989-04.pdf
It is discussed that it is known to slow down over a two year period and require maintenance. Whether that is replacing/recharging the batteries or re-lubrication as the oil dries out and friction increases.
james_s:
I'd bet that there's a magnet in the frame and each of those boxes has a circuit similar to that used for the animation on the battery powered Kit-Cat Klock. Those have a double coil with a single transistor and a magnet attached to the pendulum. It runs for a year or two on a pair of C batteries. A carefully balanced wheel in a box with good ball bearings takes n extremely small amount of energy to keep it going. Actually it could be even simpler than that, there's a gray box near the hub that could easily contain a circuit and batteries. The copper pipe and the block with the heatsink in the base is obviously decorative.
mikeselectricstuff:
--- Quote from: wilfred on April 24, 2023, 02:36:02 am ---
Also there is this article in the April 1989 issue of Electronics and Wireless World which has an article on the ball bearing motor.
https://worldradiohistory.com/UK/Wireless-World/80s/Wireless-World-1989-04.pdf
--- End quote ---
The ball-bearing motor is not related - it's a curiosity with little practical use, drawing insane amounts of current to make a purely thermal motor.
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