Magnet motor , tried to replicate a 2nd working proto. Unsuccessful so far :(

[clearchrome]

@jeffc

Thanks!

Yes, I can use that to cover the X motion of the magnet.

As for the X-Y I was thinking of a spring mounted magnet, look at my picture. The spring diameter and height would have to be determined with experimentation.

For the rotation, I'm still thinking. (I keep thinking of those key wrench, but not very handy here)! Ha!

If multi-axis motion is really needed, take a look at this option.  Allows a range of motion but should be more limited/controlled than a spring.  Note you'd have to figure out how to make this work on a CD.  I think instead of a nail, you could just use an inverted flat head bolt and adjust a nut from the top to vary the amount of "play" the stiff L can make. 

Again, I'm not sure if you really need this much range of motion, because I can't visualize there being that much motion in your original model.  But if you do, this might provide the level of control and ability to vary the motion limits which could benefit the experiments.  I think it would be much harder to make spring variations (length, material, coil diameter, etc.) but with this arrangement you could more easily vary the height of the "nail" (or bolt/nut combo) and to position to vary the motion characteristics.

Regards,
jeffc

If I look at Vidar comment, he's right!  We need to keep the 3M tape effect in focus. Using the pinned "L" magnet attachement, were are going back to square 1, meaning the magnetic gate problem will probably show back (not sure but its need to be confirmed and tested)

And for the motion part, you are also right ... little movements is necessary, I made my mspaint pictures very big for understanding purposes, but these will have to be as small as the magnet cube themselfs.

[jeffc]

Yes your right. I'm focusing on getting the same effect  ... as for the centripetal acceleration (I don't know), i'm trying not to use my tape as it does not hold the magnet very long, a spring version will have to share the same physical dynamic properties of the tape I used. I will build both setup, one with a spring version and one with tape (same as initial one) to see if I can record on my cam the effect before it unglues again and compare them togheter.

Actually I find that a spring as the closest dynamics to the 3M tape , you can compress and move the magnet from different sides (so does the magnet on the 3M tape, it has a spongy foam feeling to it so you can actually press on it and it bounces back up .)

@clearchrome

I really hope you can get the tape version going once more so we can see the video. I think that will help everyone analyze the effect so we can better contribute ideas to making a permanent model. 

Best of luck!

Regards,
jeffc 

[clearchrome]

Hi, you could try and use 3M foam tape again, only this time, remove original adhesive with a solvent like alcohol or petrol and then use thin cyanoacralyte (crazy glue) on the flexible 3m tape substrate to prevent your problem of adhesive coming loose.

Another idea: If you want to seperate backward/forward rocking from side-to-side rocking then try and get hold of thin rubber tube and mount mags on that using cyano.

GOOD LUCK!

I used crazy glue on my 2nd test setup. It's a good idear, I just hope that the strong cracy glue will not melt the adhesive molecules and make it less stickier (will have to test this first). Let you know about that!

For the tube part , how do you see this working?

[ledset]

I was thinking that you could maybe carefully glue small hollow rubber tubes accross each magnet and then mount those onto the cd. The rubber tube would provide flexibility by deforming, but mainy in 1 axis only, so you would get a 1 degree of freedom flexi-mount.

For the tiny magnets you are using you could use fishing float rubbers available at any fishing tackle shop cut to the width of your neo cubes and then very carefully cyanoed to the cube.

No force:
[  ][  ][  ][  ]
O O  O O

Repulsive force from left:
[  ][  ][  ][  ]
O O  O O

One idea to make the magnet arrays moveable on your CD would be to make modular arrays on small rectangles of thin plastic (maybe CD plastic?) and then you could use weaker adhesive to mount this modular array to your CD.

Using different tube orientations you could have arrays that rocked side to side or flexed forward/backward.

Having said all of this however, I would concentrate on getting your original config. workking again, setting it up exactly as you had it.

All the best.

[jeffc]

I was thinking that you could maybe carefully glue small hollow rubber tubes accross each magnet and then mount those onto the cd. The rubber tube would provide flexibility by deforming, but mainy in 1 axis only, so you would get a 1 degree of freedom flexi-mount.

For the tiny magnets you are using you could use fishing float rubbers available at any fishing tackle shop cut to the width of your neo cubes and then very carefully cyanoed to the cube.

No force:
[  ][  ][  ][  ]
O O  O O

Repulsive force from left:
[  ][  ][  ][  ]
O O  O O

One idea to make the magnet arrays moveable on your CD would be to make modular arrays on small rectangles of thin plastic (maybe CD plastic?) and then you could use weaker adhesive to mount this modular array to your CD.

Using different tube orientations you could have arrays that rocked side to side or flexed forward/backward.

Having said all of this however, I would concentrate on getting your original config. workking again, setting it up exactly as you had it.

All the best.

I guess if you needed multi axis movement you could use little rubber balls of some sort.  Although, I don't know if you could find rubber balls small enough while being hollow.  If they are not hollow, the question is would it be to stiff to allow for enough range motion for the effect.  Maybe the glue setup you are working with will work and we won't have to worry.