Howard Johnson Replication Tube Claim

[nyctuber]

Surplus section @ Allmagnetics comes pretty close.



Allmagnetics.com

**Surplus**


(Length/ Width/ Thickness) (inches)



Neodymium Block

(NBSA.5X.5X2)  2 x .5 x .5

(NBSA.5X.47X2) 2 x .47 x .5

http://www.allmagnetics.com/surplus.htm



Samarium Cobalt Block

(SCBSA.31X.35X2) 2 x .35 x .31

(SCBSA.50X.55X2) 2 x .55 x .5

http://www.allmagnetics.com/surplus.htm



Ceramic

(CBSA .51 x .66 x 2.5)   2.5 x .66 x .51

http://www.allmagnetics.com/surplus-ceramic.htm


Arc

Allmagnetics supposedly lent Mylow a remagnetizer, perhaps they will magnetize to proper orientation by request

http://www.allmagnetics.com/surplus-arcs.htm

[joe_1001101]

John

Aluminum because the reactions to a moving flux are wildly different. Ferrous material simply shorts or redirects the flux.

Maybe I will just leave the Mac G5 aluminum panel as is without cutting.  It's balanced now from the dot in the middle. (w/o magnets)

[nyctuber]

lol

[billmehess]

Well that's one way to get out of not having to show it. Of course he did not really send it to anybody. Hopefully if he did it would have been to Sterling, but we all know by now what's really going on- don't we.

[TinselKoala]

@TK...

well given your broad experience, how would you recommend cheaping this up so that we can get into the $500 range and still experiment on the key factors?

Sorry, went to sleep there for a little while.
Seriously, it all depends on what you think the key factors are. Aluminum and inertia and bearings and quick configuration change seem key to me. Others concentrate on magnets, wobbleability, and trying to get it to "work".
I dismiss the latter from the outset, so I am not constrained in what I will try, nor do I ignore what my instruments are telling me in favor of anecdotal observations that might support a pet theory.
So an 18 inch diameter 1/4 inch thick plate of 6061-T6 genuine aircraft structural aluminum, mounted on some adequate bearings, with a bunch of mounting holes and some other machining, was key in my mind. I have lots and lots of magnets, but I went ahead and bought a bunch more anyway, mainly just to populate the disk with something more interesting than weights. The disk will be the single major expense; I machined mine myself on manual tooling, so the major cost there is time (and blood; my hands are still healing). I am really good at scavenging parts and we have some excellent surplus stores in and around hereabouts so the rest of the stuff didn't cost much. But there are all kinds of hidden and accumulating costs, not the least being lost time from paid work.
But, you see, I am doing real research on the behaviour of circular gated SMOT systems like the HJ/MyLOW wheel configurations, and this was an excellent excuse to develop the testbed into something that would yield real data. So your mileage may vary.
The most important advice I can give is to not neglect your family, and don't spend more than you can afford to lose. Because there won't be anything coming back, except knowledge (and hopefully a little wisdom as well.)

(EDIT to add I know there are those who object to my holes and slots...er, in the disk I mean...but the worst that could happen, as far as I can reason, is that the effective diameter of the disk is reduced--perhaps instead of 18 inches "active" diameter I might only have 16 inches, since there is a row of holes at that diameter. I'd be glad to hear logical reasons why a row of holes, or a slotted edge, might kill or inhibit a magnet motor of this type from working--assuming of course that all the other reasons they don't work could somehow vanish...)