CurtPalme.com Home Theater Forum

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Joust · Posted: Fri May 09, 2008 12:53 pm Post subject:

I would like to see you try what I suggested.

after you sprinkle the filings on the paper. Tap it a few times. the filings will move and further define the magnetic structure inside the rings.
those forces are very weak inside there. if you simple shake them on, they more or less stay where they lie.
i have a 4 pole somewhere. I can try it when i get a chance. but I too am up to my eyebrows in alligators.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

ok guys, I found the post with how CMJ made the CPC 6 pole magnets he mentions them in a few threads but here is where he describes it with the most detail.

CMJohnson from the frankenyoke thread:

Joust · Posted: Fri May 09, 2008 4:25 pm Post subject:

Marquee rings do not have tabs
they have teeth with a rack and pinion type setup.

there is a small registration tab that has a colour code painted on it. Blank ones have no colour.

my only quesiton is:
do the "recording" magnets go on the face of the ring, or on the edge? i think the edge.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Joust · Posted: Fri May 09, 2008 5:57 pm Post subject:

Oh. i like the little knobs on the pinion gears.

i would disagree with your approach of laying them on the flats. you would want a pole on the edge IMHO.

Joust · Posted: Fri May 09, 2008 6:11 pm Post subject:

OK,
I just scored 10 super magnets.
I'll try it

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Joust · Posted: Fri May 09, 2008 6:51 pm Post subject:

I guess the thing to determine is if the pole of the magnet we want created is prependicular or horizontal to the neck of the tube.
I'm thinking it needs to be perpendicular to the neck to affect the beam. I think i hear you saying you want it horizontal to the neck.

another think CM said was that he set the magnets with alternating polarity. and he used 6 pairs.... I had only 10 magnets. Sad

but I scrounged up two more Smile

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Joust · Posted: Fri May 09, 2008 7:43 pm Post subject:

something else you missed?
alternating polarity

Joust · Posted: Fri May 09, 2008 7:45 pm Post subject:

we don't need Chris.
we are Re-pioneering Smile

I don't' see other known modders saying too much either.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Joust · Posted: Fri May 09, 2008 10:28 pm Post subject:

no and yes.
yes but then alternate them

cmjohnson · Joined: 03 Apr 2006 Posts: 5180 Location: Buried under G90s

I've done this. Made 6 pole pairs.

Start with ANY spare pair of CPC rings.

Using a commonly available bulk tape degausser, degauss the rings to remove their current pattern.

The trick to a degausser is that you leave it turned on as you back away slowly from the magnets until you're well out of range of them,
so as to leave no residual magnetic field.

I then took six pairs of 1/4" diameter Neodymium disc magnets and marked them for north and south poles using paint, or even
permanent markers (but it will rub off the plated magnets before too long) and then carefully clamped the rings together with the
magnets, with the magnet pairs arranged evenly in a circle around the rings, and alternating polarity around the circle. So one
side has n-s-n-s-n-s- and the other side has s-n-s-n-s-n- polarities showing.

Once the magnet pairs are clamping the rings and are properly spaced, gently rub the pair around a little on the CPC ring pair,
but GENTLY, and not far. This helps to "persuade" the magnetic domains to assume their new orientation.

It's important to NOT let one pair of magnets get too close to another pair or they'll attract each other.

It's also important to place the magnets where they belong correctly the first time, and NOT try to slide them around the ring into
proper position.

If you do either of those, remove the magnets, demagnetize the CPC rings, and start over.

CJ

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

Thats exactly as i pictured it thanks ! I am at work and didnt feel like drawing it up to show you Very Happy

Athanasios

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

There you are CJ !!! I was hoping you'd chime in ...but we figured it out with out ya ! Wink

While you here i was wondering if you have the original pics from your frankenyoke thread since they are all dead links. if you send them to me i could repost what you have with the pics unless you can link them yourself.

Athanasios

garyfritz · Joined: 08 Apr 2006 Posts: 12088 Location: Fort Collins, CO

Hm. Guess I assumed you would place the magnets on the flat sides of the rings, not inside & outside. It does make sense, though.

Joust · Posted: Sat May 10, 2008 1:17 am Post subject:

i was imagining on the inside and outside not the flats.

Nashou66 · Joined: 12 Jan 2007 Posts: 16171 Location: West Seneca NY

The way Cj describes it in the above post would be like an Oreo cookie missing the center and the cream center would be the Neodymium magnets ,only not spread like the filling, placed at 6 equidistant points in the sandwiched CPC pairs.

Athanasios