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How does a Bonetti machine work and how is it different from the Wimshurst machine? I understand the basic operation of the Wimshurst machine, and that the Bonetti machine lacks sectors and needs initial charging but not much more than that. I found this page: which is helpful but it doesn't seem to explain this. I wanted to make a Wimshurst machine like in makezine 17, but then I found out about the Bonetti machine and it seems more efficient and I don't even need sectors.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
It works exactly as the Wimshurst machine, but transports charge directly over the insulating disk surfaces, using sets of wide brushes in the neutralizers (better) or combs to move it. It is more powerful, but quite inconvenient because it needs an initial charge on the disks to start. It may not work if the humidity level in the air is high, while a Wimshurst machine still works. You may need another machine to start it. (I wrote the page in the link.)
Registered Member #72
Joined: Thu Feb 09 2006, 08:29AM
Location: UK St. Albans
Posts: 1659
The induction charging geometry each uses is exactly the same. Shifting the charge about between places on the plates is different.
In a Whimhurst, it has metal sectors and brushes, so charge can flow at any voltage. Just the slightist stray charge is enough to get it started, so it self-starts.
A Bonetti OTOH has an insulating plate surface, so charge has to be sprayed onto/off of the plates, which requires a minimum voltage of, ooh, guesses here, somewhere between 1 and 10kV, enough to create a corona wind anyway. So it needs a kick start.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
You both are right. A Wimshurst machine can start a Bonetti machine easily. Place one of the terminals of the Wimshurst opposite to one of the neutralizers of the Bonetti, turn the Wimshurst until it is fully charged, and then turn the Bonetti. Move the Wimshurst away after the machine starts. It will keep the charge for long time in a dry place. It's also possible to start the machine, in a dry place, by placing a large PVC tube electrized by friction behind one of the neutralizers and then turning the machine.
Registered Member #834
Joined: Tue Jun 12 2007, 10:57PM
Location: Brazil
Posts: 644
To excite a Bonetti? Not critical. Even one of those made with CD disks would work. A Bonetti machine with combs at the neutralizers is convenient to run at high speeds, since nothing touches the disks. It's perfectly possible to build one with two motors powering directly the disks.
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How does a Bonetti machine work and how is it different from the Wimshurst machine?
