Working Magnetic Motor on you tube??

[CLaNZeR]

Is that bearing good enough: http://www.raidentech.com/11h04-08.html

It does not really give a spec on that link.

The ones I have used are MF63ZZ 3X6X2.5 from http://www.technobots.co.uk/acatalog/Online_Catalogue_Miniature_Flanged_Ball_Bearings_385.html

But I am doing it different too the way AL has monted his Rotor.

If I find the Top bar is a hinderance then I will probably mount the bearings in the Rotor and use a shaft poking up from the base as AL did.
I will mount the Stator bearings using the 3mm Flange bearings also but they will be on shafts.

Worth doing a search for flanged miniature bearings as over in the states you are going to be spoilt for choice I reckon.

[Bruce_TPU]

Hi Everybody,

I can see that there is quite a buzz going on here concerning Al's device! I have finished the 3D CAD model and am currently making some dimensioned drawings for those of us who don't have AutoCAD or a CNC machine laying around. For those of us who do, I will be posting the CAD files as I said before.

I am still waiting to get confirmation about the diameter of the rotor disk. I saw the other 3D renderings that were posted and they look nice but if you take a look at the slots in the rotor disk, they look the same as the drawing that I labeled incorrect. I'm just about ready to post the drawings but I need to know which image is correct. (for those of you wondering what I'm referring to, here's a link to my post earlier in this thread):

http://www.overunity.com/index.php/topic,3871.msg68313.html#msg68313

The sooner I can get this straightened out, the sooner I can post the information.

God Bless,
Jason O

Hi Jason,

I found this from a quote of Al, in the Peswiki .txt file named Judson.

"That's good, because I just invented them yesterday.

Magnokinetic because that's what they are damping;
dampers because that's what they do; Judson, because,
well, somebody I used to know went to high school there.

A dimensioned sketch of the bearing/magnet holder assembly is posted on the other site. The baseplate that I am using is acrylic plastic, 5/8 in thick, 7 3/4 in x 8 1/2 in,
with a 1/4-20 threaded hole in the center for the rotor axle, and 13 evenly-spaced 4-40 threaded holes for the stator magnet bearing holders, on a circle of radius 3 3/8 in centered on the axle.
The rotor is 3/4 in thick piece of HDPE plastic, 2 7/8 in radius, with a 0.500 in center hole bored all the way thru for the flanged axle bearings. Magnets are held in 8 evenly-spaced 1/4 in wide slots, 7/16 in deep, inner edge of slots at the 2 1/2 in radius from center.

This is the basic layout for the 13x8 version that I am experimenting with. But I am mostly just using 3 stator magnets and a couple of "dummy" aluminum pieces of the same size as the magnets, also mounted in the same type of bearing holder.

The stator magnets are mounted by a single trimmed 4-40 SHCS and a little washer to make sure only the inner bearing race is contacting the screw or the baseplate.
The rotor magnets are press-fit in place."

I hope that helps you to finish the CAD drawings.

God Bless,


Bruce

[CLaNZeR]

AL's reply to regards jdo's question:

***********

My practice on prototyping is to whittle and gnaw on things first, big non-critical dimensions may be only approximate, then when I am forced to draw or otherwise document things, I " rationalize" these dimensions.
So if the rotor blank comes out 4.878 or something weird like that once I've got it faced and trued, that's fine for prototyping, but I am most likely to rationalize that non-critical dimension and make it 5.000 on the drawing or documentation.
You follow?
Sorry if that throws anyone off. I am aware that you folks are doing photogrammetry over there, believe me it isn't necessary.

Here's an actual set of measurements made right now:
Material HDPE
rotor diameter 144 mm
rotor thickness 18 mm
distance from OUTER EDGE of rotor, on a radius, to INNER EDGE of magnet slots 13 mm
slots are symmetrically arrayed, 1/4 " nominal width, 12 mm depth
slots cut in a single pass with a 2-fluted end mill 0.250"

I hope that helps.

[Jdo300]

Hi CLaNZeR,

Thanks! That clears that issue up now.

Now, there is still one thing I don't have information about and that is the metal plug in the center that he mounted the 3.5mm bearings in for the rotor. As I understand it, he just used a screw with press-fitted flange bearings in an earlier model. I am interested in knowing if that would be sufficient for it to work or if the added stability from the machined bearing plug is necessary. If so, I would like to get more information on it to include in the blueprints. At the moment, I just have a 1/4"/ 20 bolt for a shaft in the 3D model with the press-fitted bearings.

Could you also pass this along to him?

@Omnibus & Everyone,

I noticed some have questions about the rotor magnets. If you look at the overlaid drawing I posted of the rotor disk, you can see that it is a cylinder magnet that is 1/4" in diameter and just slightly longer that 0.5". My best guess is that it is 9/16" long from the image. The nearest size that KJ Magnetics carries is part number D48. I also recall that Al mentioned on the forum that the magnets were about 0.5" long.

God Bless,
Jason O

[CLaNZeR]

Now, there is still one thing I don't have information about and that is the metal plug in the center that he mounted the 3.5mm bearings in for the rotor. As I understand it, he just used a screw with press-fitted flange bearings in an earlier model. I am interested in knowing if that would be sufficient for it to work or if the added stability from the machined bearing plug is necessary. If so, I would like to get more information on it to include in the blueprints. At the moment, I just have a 1/4"/ 20 bolt for a shaft in the 3D model with the press-fitted bearings.

Could you also pass this along to him?

Hi Jason

I think this has remained the same but not 100% sure.

If truthfull as well, he has probably covered this in one of the 1000+ posts across different threads over at the Steorn Forums and I think the repeated questions are wearing himself and OC down. So I do not want to personaly hassle him anymore.

At the end of the day a simple shaft mounted in the base should do and cannot see it being a major issue as long as the design creates the least friction and movement.

Cheers

Sean.