Roll on the 20th June

[capthook]

What are you guys planning to use as ferrite goes? Soft, hard? And do you know of any easy ways to get it without ordering it?

I got my cermaic magnet from Radio Shack

All other magnets from http://www.magnet4less.com/index.php
Order/getting magnets ANYWHERE else is crazy!
Check yourself - really - they are 1/2 the price from most anyone!

As to soft/hard/iso/ceramic etc.... everyone is still confused.
I would say NO ONE is using 'iso-ferrite'.  It is a relatively hard to find/speciality order item (and very weak)

Here is a merging of my previous posts - re-thrown together in a haphazard way that might clarify some things I hope.....
- - - -
The whole isotropic/soft ferrite thing can apparently be put to rest:  the effect is present no matter what magnet you to try activate.  I saw results with:

1: a small ceramic disc magnet
2: a small ceramic block with a hole in the middle
3: a larger ceramic block
4: a small neo disk
5: a large neo block

Isotropic ferrite" is "hard" ferrite with "randomly orientated grains" that has been magnetized into a permanent magnet - just a weak one because it has no concentrated field.  It will maintain it's magnetic properties just like any permanent magnet.  It will stick to steel etc.
As to your question of what pole will appear when used with another magnet - my guess as to what happens is that it basically just channels the "charge" through it - so if you put a S face against it - a S field will come out the other side.
Now when "de-activated" it will still be a weak magnet and still attract steel etc.

Soft ferrite (as oak taught us) "does not retain significant magnetization".  But it's not a magnet itself - so it won't stick to steel.  But will become "a magnet" while engaged with another magnet for the duration of the proximity.(passing the same pole through like the iso)  But when "switched off" - it will have zero attraction to steel etc - no longer a magnet.

So - I guess the goal of the application would determine the choice of iso or soft?

You want it to turn on and then completely off: soft ferrite
You want it to get stronger and then weaker: isotropic ferrite

hmmm - wondering which one would "channel" a larger percentage of the field?
Would soft ferrite be larger because it doesn't have to fight the random magnetism of isotropic acting like water through a filter? ? (I'm thinking yes)

From queues? video ? it appears he is actually using ?soft ferrite? where-as Quinns? video appears to be either a weak ceramic magnet, or actual ?isotropic ferrite? - (?)

Soft ferrite seems to be mostly for EMI suppression and various core-material applications and usually come in cylinder or disk form. (or "E" or "I" shapes)

Hard vs. Soft Ferrites:

Hard/Soft Ferrites ? Term relates to the coercive force(1) from remanence(2) to zero.  Hard ferrites are generally permanent magnets and can require up to 2000 oersted to demagnetize from remeanence to zero, where soft ferrites require small amounts of coercive force, typically from .05 to 4 oersted.


(1) coercive force: the magnetizing field strength required to bring the magnetic flux density of a magnetized material to zero

(2) remanence: the flux density remaining in a magnetic material when the applied magnetic field strength is reduced to zero

definition of isotropic ferrite

Having magnetic properties that are independent of the magnet orientation. Most magnetic materials are anisotropic as cast or powdered: each crystallite has a preferred direction of magnetic orientation. If the particles are not physically oriented during manufacture of the magnet, this results in a random arrangement of the particles and magnetic domains and produces isotropic magnet properties. Conversely, orienting the material during processing results in an anisotropic magnet.
- - -
P.S. ceramic magnets have 'grades'
Most are grade 5 (radio shack etc.)
Strong ones are grade 8
Iso ones are grade 1 - barely a magnet

[therealrasta]

Well.. I am gonna just rip some ferrite out of a few transformers and see whats up with those ferrite cores. Got a shit load of pc power supplies laying around that bit the dust.


edit -- a lot of trouble and they suck.. So don't bother with that.

[cub3]

http://www.save2pc.com/

The light version is free and works great... I use it all the time...

Thanks will give it a go

Den

[exxcomm0n]

Hey Exx - did you notice Archer's change in tone?  He actually was posting - which he hasn't done in awhile - and did so in a very civil, coherent, and even helpful manner.
Maybe he read Bombers post?   
Not wanting to rock the boat I didn't post my thoughts on his vid thinking another was to come...
that not being the case...
I found it................ well..... very unimpressive 

Hola cap'n

Yes I noticed, but that's happened before too as it sorta reminds me of when he missed the June 20th deadline.

Hell, I'd become much more genial when I didn't have time pressure (deadline) or was going to walk away from a project for a while to spend time on my personal life and wouldn't have to weather personal attacks hourly.

The demo does look for all the world like a slightly out of balance wheel turning, but that's what it is (magnets aside).

If that's what I think it is OR I think it's something more, I still have to experiment to be absolute in the fact since he's not going to be posting his results for a while.

You'll be stuck with me, or another brave soul boring the chit out of you and trying to throw in *uck every so often to make it more like what you're used to.

I have no set deadlines, and as you have seen I equate most negative comment as being  amusing, but inconsequential.

I make long boring videos that are well lit and (over) explained.
I use household materials (when possible).
I make the intrepid viewer hoping for enlightenment and entertainment suffer through long bouts of tool use watching and ear bleeding singing/humming.
There might be a whole 3 exciting seconds in 25 minutes worth of footage.

But I have yet to hear anyone challenge their validity, and only 1 think a vid was proving something it wasn't (full revolution, and he caught on pretty quick after I said that it didn't).

Do I really act like someone that afraid of others opinions?

Anyway, so.........ya in?



EDIT

I'm doing an major upgrade on my system to get compiz, blender, and povray working with OpenGL so I might not be around for a while.
(Can you hear the sighs of relief?)

[capthook]

But I have yet to hear anyone challenge their validity, and only 1 think a vid was proving something it wasn't (full revolution, and he caught on pretty quick after I said that it didn't).

But your last vid did do like 80% round......

Into 1st wall: small halbach array as shown by CLaNZeR followed by 1 or 2 trigates into your array
Out of 2nd wall: the same as above but reversed.  And a larger gravity assist as per Archer.

and/or gwhy's setup (when he adds details - seems interesting) thrown in the mix with the above or combination of all .... or.....

Trial and error.. then try and error... then error and try.... then ....