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Old 03-22-09, 11:59 AM   #1
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New Design Theory...

I was just sittin' 'round here in Germany trying to figure out wth I'm doing here when an idea struck me for forks..

They have rigid, Air-Sprung, Springers, Oil Compression and all that... When will a magnetic fork come around (if it hasnt already, I'd google it but the internet is painfully slow, took me 5 minutes just to get here)
If you think about it you'd be able to fine tune it, with different amounts/strength magnets, no seals to blow out or replace, and nothing would wear out...


Thoughts?
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Old 03-22-09, 12:03 PM   #2
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Magnets capable of doing that in a mtb fork platform would be really, really heavy, and really, really expensive.
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Old 03-22-09, 12:08 PM   #3
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Also, with what I can remember from GCSE physics, bottom out and your buggered.
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Old 03-22-09, 01:36 PM   #4
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Also, with what I can remember from GCSE physics, bottom out and your buggered.
How so? And you'd probably still need an oil bath and seals of some sort.
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Old 03-22-09, 02:12 PM   #5
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you'd probably need electro-magnets, and a lead acid camelbak, or a nuclear reactor.
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Old 03-22-09, 03:39 PM   #6
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How so? And you'd probably still need an oil bath and seals of some sort.
If you whack a magnet it looses some of it's strength. I haven't done magnets since GSCE but I think thats right. Also the stuff they are made of generally isn't the most impact resistant material.
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Old 03-22-09, 04:11 PM   #7
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Old 03-22-09, 04:34 PM   #8
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I took some big magnets off of some subwoofers and made trampoline shoes..........
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Old 03-22-09, 05:10 PM   #9
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besides everything with design issues ect ect i don't think it would offer very good suspension feel, i base this on varous magnetic triggers on paintball guns i've used (both attract and repell style) and on general playing with magnets.
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Old 03-22-09, 05:24 PM   #10
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Magnets capable of doing that in a mtb fork platform would be really, really heavy, and really, really expensive.
But really, really, really cool.
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Old 03-22-09, 05:46 PM   #11
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what if you get to close to the wrong type of metal and your fork gets stuck?
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Old 03-22-09, 07:01 PM   #12
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You could use the magnetic fluid to dampen a shock. That would be nice. You push the fluid through an orfice, (maximum + largest that would allow free flow) then move the magnet closer to slow the flow. The magnet tries to harden the fluid and acts as a restriction. I has samples of this stuff 15 years ago, and just now automotive is using it in a few cars.
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Old 03-22-09, 09:20 PM   #13
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You could use the magnetic fluid to dampen a shock. That would be nice. You push the fluid through an orfice, (maximum + largest that would allow free flow) then move the magnet closer to slow the flow. The magnet tries to harden the fluid and acts as a restriction. I has samples of this stuff 15 years ago, and just now automotive is using it in a few cars.
kinda. it has to do with lining up molecules. the new audi TT has it and if you get 5 guys jouncing the rear of the car and trigger it to full lock via the 5051 scan tool it is pretty cool.
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Old 03-23-09, 07:38 AM   #14
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would be pretty cool, if it would work...
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Old 03-23-09, 09:38 AM   #15
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You get the right magnetic thing going and you wouldn't need 'suspension' in the traditional sense - - bike would just hover at a comfortable altitude like the "Space Coupe" in Dick Tracy:


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Old 03-23-09, 10:16 AM   #16
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Well, hey I tried to spark an Idea.

the Magentic Fluid is an idea, I remember reading about it from one of the foreign car brands around here.
(it wasnt audi, so I guess its not a totally new idea)

But I still think there's more to go on with magnets, using those rare earth metal magnets (like the ones mythbusters used in their show) have insane power, They had them bout the size of a hand, and the generated like 1000 lbs of force.
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Old 03-23-09, 11:40 AM   #17
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Rare earth would certainly be the way to go... my only concern would be the compression characteristics... without any seals or dampers or anything, it would just throw you off on the rebound. You could add a plunger and filled it with oil to dampen the movement some, I don't think the repulsive force would be terribly conducive to mountain riding, maybe XC, but it wouldn't be a huge distance that it could repel and keep up a rider, while it would compress very stiffly, meeting a lot of resistance with only a small amount of movement.

Finally, and probably most importantly, say goodbye to steel cables, housings, hardware, brakes, rotors, etc. on the front fork.


All that being said, it would probably work to some extent and is certainly worthy of someone making a frankenbike with a magnetic-levitation fork
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Old 03-23-09, 11:56 AM   #18
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Yes, it could be done. However, I'm not sure it could be engineered to be made with less weight than air. The "rare earth" magnets you speek of are powerfull, but would take plenty R&D to get the specific weight ratios. How will you adjust the rebound and preloads? I think it's a great idea to persue "any" invention, see what you can find out and report back. But for real see what happens.
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Old 03-23-09, 11:58 AM   #19
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consider this site NWS in the manner that it's gory, guy has an accident with magnets.

http://www.magnetnerd.com/Neodymium%...20Accident.htm

Just be careful, okay.
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Old 03-23-09, 12:05 PM   #20
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That's the coolest!
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Old 03-23-09, 01:51 PM   #21
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Preload and stuff, IDK, move the magnets closer/farther....... no cause that would make you loose travel.

maybe tilt the magnet, so the repelling side isnt directly facing the other


As for weight, make it out of... Carbon? lol...
isnt there some sort of anti magnetic lining they make?

I know on one of my fridge magnets, the bare side sticks extreamly well, the other side with the coating , nothing at all, and you cant stick anything else to it


IDK yea, I think it'd be a cool concept but not for the weigh weenies.

id love to watch that vid, but cant, the internet stick thingy I have is slow and wont load vids or large pics/songs... wat happens?
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Old 03-23-09, 02:06 PM   #22
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What if the magnets were tiny? Oriented like fibers in muscle? Many sets in parallel, and many in series?
One could have the whole system in an open bath. This would lubricate the system and provide damping. Maybe even mimicking the damping properties of active muscle.
Thoughts?

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Old 03-23-09, 04:07 PM   #23
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Preload and stuff, IDK, move the magnets closer/farther....... no cause that would make you loose travel.
I kinda think this is an odd thread, but why would you lose travel? Why would the magnets be your "travel stop"? Your coil spring doesn't bottom out on itself, nor does an air chamber compress until there's zero volume inside.
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Old 03-24-09, 04:00 AM   #24
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The reason nothing will stick to the other side of fridge magnets is generally because they are ****ty magnets.

If you get something magnetic, and hold it up next to the magnet, then the magnet won't work through it though.

Btw, this may all be bull****, I'm dredging rather deep here.

Also why does someone think the rebound would be bad, surely it wouldn't be much difference from a coil fork.
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Old 03-24-09, 04:04 AM   #25
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I guess I didn't think of it that way. So in theorey you wouldn't loose travel... hmm.

Metzinger... you have another idea on it... it all sounds *possible*
I guess we wouldn't get away from oil baths and seal though.


-it took me 7 minutes to load this page
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Edit: But, if all we had to do was worry about replacing a seal or oil, and never worry about the spring or anything wearing out I guess thats a plus ?
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