CurtPalme.com Home Theater Forum

**Joust** · Posted: Sat May 10, 2008 3:36 am Post subject:

Nashou66 · Posted: Sat May 10, 2008 4:15 am Post subject:

Ok, So something like this?

Athanasios

outwest · Posted: Sat May 10, 2008 6:20 pm Post subject:

I spent a little more time with the Sony rings and some iron powder. In the 1ring picture, I tapped on the paper to aid the powder to migrate under a weaker magnetic force and there was definite evidence of magnetic lines arcing from one strong field to the adjacent strong field. The lines were pretty weak and the picture doesn't do a great job of showing them, but they were definetly there. On this ring, there was never any sign of magnetic lines right in the center of the ring. The powder would just move towards the closest of the four strong areas.

What I found interesting was that when I stacked the two rings together, aligning the paint marks as they were installed in the projector, the lines from one strong area to its neighbor disappeared. I repeated the test a couple of times and there was no evidence of the interconnecting lines.

Joust, thanks for the suggestion and the motivation to explore a little more.

Athanasios, I have been thinking about your ideas on the beam being pushed or pulled. My head hurts! I am simply not smart enough to offer anything useful here. I did try making a paper tube. The results were what I would have expected. Perhaps the setup needs to be better to show something more.

Nashou66 · Posted: Sat May 10, 2008 6:51 pm Post subject:

Neat!!! See I think the beam is pulled to the center by the forces of the magnets pulling at least on that ring in the pic( I assume its just one magnet not the pair). Now if there were both rings on the tube in the proper "null" position my theory would be no powder should stick to the surface of the tube as the opposite polarities should be "on top" of each other. So when we move the rings around the tube the associated"released" magnetic field of the rings would affect the beam . and as the electron beam passed each ring the type of magnetic field would control the beam each in its own way. So this is why the 2 pole is at the end of the CPC path that the beam travels, it was shaped at first by the 6 and 4 pole rings and the two pole adjusts its final position on its way to the other magnetics.

what do you guys think? make sense?

Athanasios

outwest · Posted: Sun May 11, 2008 7:04 am Post subject:

Yes. The tube picture is with a single ring. When I get into work in the morning, I will see what happens when there are two rings on the tube.

Film at 11.

Very Happy

Nashou66 · Posted: Sun May 11, 2008 12:42 pm Post subject:

outwest · Posted: Sun May 11, 2008 6:56 pm Post subject:

In the picture tube2rng, the rings are in the null position and they are tight against each other as they would be mounted on the tube. The powder does stick, but the attraction is quite weak. I had to use a lot of powder to get some to remain. In the picture tube2rn, I offset the rings slightly and the magnetic field became noticeably stronger. The filings would stand up a little where in the picture where the rings are in the null position the filings were mostly laying flat.

In the picture 2rnga, I layed the rings flat again and offset them slightly. Magnetic lines became visible, making a shallow arc into the center. In the picture 2rngb, I moved the rings to the maximum offset and the magnetic lines became stronger and made a deeper arc into the center.

Moving the rings in relation to each other seems to control the strength of the field and moving the two ring pack as a unit would then control the direction or angle of the effect of the field. Would this be a fair conclusion?

Nashou66 · Posted: Sun May 11, 2008 8:12 pm Post subject:

**AnalogRocks** · Posted: Sun May 11, 2008 8:26 pm Post subject:

outwest · Posted: Mon May 12, 2008 5:41 pm Post subject:

**AnalogRocks** · Posted: Mon May 12, 2008 10:24 pm Post subject:

Nashou66 · Posted: Sun Sep 21, 2008 6:25 pm Post subject:

Joust, have you tried this yet? haywood is curious about it and so am I to tell the truth. Is my diagram above correct or should the magnets underneath have the polarity reversed?

Athanasios

Heywood Jablome · Joined: 12 Mar 2006 Posts: 1542

Hmmm... I may have to mount a set of rings on a plastic spindle and run my 3D Gauss probe thru the center Wink

Nashou66 · Posted: Sun Sep 21, 2008 11:42 pm Post subject:

Heywood Jablome · Joined: 12 Mar 2006 Posts: 1542

I'll see if my old ring magnet qual fixture is still around... It had been for perpendicular qual of the 15 pole-pair magnet I used on the SmartBar, but it should handle axial pretty easily.
I'll send some emails to my technicians tomorrow and see what I can gin up. I have the CPC magnets from BG801/RD801, BD1208/2, and probably a few others. (The only genuine marquee magnetics I have are in the 9501, which I hope to be hanging shortly.)

**Joust** · Posted: Mon Sep 22, 2008 3:55 am Post subject:

i haven't tried it. don't have a spare set of rings and I didn't need a 6pole.
as for your drawing, As I described above I believe you would need to put the magnets on the edge of the rings not the flats since the effect you are after is into the center of the ring not on the flat side.
but there will be a field generated there too so it may work.
try it.

Heywood Jablome · Joined: 12 Mar 2006 Posts: 1542

**Joust** · Posted: Mon Sep 22, 2008 12:10 pm Post subject:

I disagree, mainly from the appearance of the magentic field from the paper over the ring with the iron filings on top.

the pole seems to point directly into the center of the neck.

Heywood Jablome · Joined: 12 Mar 2006 Posts: 1542

You may be right: http://www.physics.ucla.edu/plasma-exp/beam/
Perhaps I'm thinking of an electric field.

km987654 · Posted: Mon Sep 22, 2008 10:23 pm Post subject:

I have not seen anyone describe why some magnet sets have the unmagnetised rings either in the middle or at one side. I have tubes from two different versions of the same PJ with the same tubes yet the unmagnetised rings move from the middle on one version to the outside on the other. I imaging that they are all 4 pole magnets or are they??