Quote from: CompuTutor on January 13, 2010, 01:46:56 AM



Or bringing it right down to a 1/4" shaft,
and up to a 2" OD disc.



I have 5400 and 7200 rpm ones to play with.

They seem to have used a spot weld style machine
on the assembly line to embed a hardened ball bearing
into the end of the shaft.
And the grounded static dissipation finger
touching it is certainly overkill too.
They spot welded a hardened pad on it too.

So one contact is already fashioned with these test units.

I figure three roller bearings at the 1/3 points
around the edge of the hardrive platter's disc
on spring fingers with matching pressure
should provide three take off points to test with.

Given the weight of the magnet collective, the speed and the laminations of Cu, Al and polycarbonate for the actual disk, I'm looking at 3/4" shaft cold rolled, minimum.  There are places to cut corners, and this ain't wunnathem.

You won't catch the turtle in the same room as a 1/4" shaft setup, I don't care how many bearings you have.

That's scary

Turtle

Mike,the pm won't work.

These are the biggest rings I have,

http://www.magnet4less.com/product_info.php?cPath=1_13&products_id=322

but I have not set up the dynamo yet.

That's still a couple weeks away.  Working against a deadline with another project

Turtle

Quote from: keithturtle link=topic=626.msg221981#msg221981 A=1263367946
Given the weight of the A collective, the speed and the laminations of Cu, Al and polycarbonate for the actual disk, I'm looking at 3/4" shaft cold rolled, minimum.  There are places to cut corners, and this ain't wunnathem.

You won't catch the turtle in the same room as a 1/4" shaft setup, I don't care how many bearings you have.

That's scary

Turtle

Heheh, I agree !!!

I meant the 1/4" ID ones for people here
to spin a small disc at a much more sane speed
like that of a toy's DC motor or something. 

I realize in the same post I talked about
5400 and 7200 RPM HD discs,
and your setup too without segway
(Except for three spaces to attempt to indicate separation)
in an overlapping sort of way.

Sorry 'bout that.

I've gone back and edited the post
to included astericks, and indicate low RPM's

Thanks for pointing out the possibility
of my post's being misunderstood. 

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Hey, when the economy fails (And it seems it will),
will Turtle-Buck's be the new currency

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Wunnathem ?

http://www.google.com/search?hl=en&q=Wunnathem

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Wunnathem = colloquialism for the phrase "one of them", written as it is spoken in my buckeye dialect of the king's english.

Turtlebucks- them greenbacks that the turtle spends on projects, usually sourced in overtime worked at the mill, since Mrs T keeps tabs on the rest.

<grin>

I knew you'd not spin too much of a load on the pencil shaft, CT; just keeping things safe, I hope.

Anyhow, since all of the mags will be one pole on that brown disk, would it make sense to assemble an identical one with the opposite pole exposed?   As in, if one didn't work, mebbe the other would? It's only turtlebucks...

I'm thinking "magnetosphere interaction" as an element of this thing generating anything, and might the fact that I'm north of the equator having anything to do with it?

Just an honest question... cheaper than flying it to Australia to test it there... BTW, is that why DePalma did tests in New Zealand?

Turtle

Okay,
now I don't know if I sound mentally challenged or what.

Quote:
"In order to make full use of the current capabilities of an N generator and to accommodate the use of non-conducting "ferrite" permanent magnets or electromagnets, an N-machine is constructed as in Figure B. The N-machine utilizes a copper or bronze conducting shaft and disc and ferrite ring magnets cemented together as shown." - Bruce De Palma

Bruce wrote that in 1977
Source: http://www.rexresearch.com/depalma/depalma.htm

But Neo magnets were not invented until the early 1980s, I hear.
That may be why De Palma didn't mention them in (in that article)

Never the less I recomend trying both, Neos and Ferrites, and see which do what different etc..., never take a stranger's word for it, expecially in a forum, some are disinfo and some are just people whom are simply quoting the misleading books they were taught from.  Such experiments can be done cheap on a small scale, small mags, with aluminum discs, and string pull like a toy top.

Also I would assume the thicker the disc, the more current you get, so a coated Neo acting as the disc too, might not be the same as a fat disc between two megnets.

Good luck.