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Screw Magnet Motor ScrewMagnetMotor.com Open Source Project • SMM Home • Latest • Replications • Variations Category > SMM

Reports of replications of the Screw-Magnet Motor design first reported by xpenzif on Oct. 15, 2007. Several researchers at the OverUnity.com forum (http://www.overunity.com/index.php/topic,3482.0.html), and elsewhere have built replicas, or are in process of doing so, for this very simple design.

Replications

Feel free to post yours here as well. This is a publicly editable site.

Successful Replications

none yet

Partial Success

Bossnik -- Enough Joy

Submitted on Oct. 20, 2007

I have had marginal success replicating this device. I have flattened all screws and positioned them perfectly. I have gotten over 360 degrees of rotation(which I feel is very significant!) I am using an old stepper motor for a mount, but a smoother bearing might do the trick, UNLESS xpenzif's design incorporates the small bits of attraction and repulsion that you notice in a stepper motor when you try to spin it manually. Maybe he staggered the screws to line up somehow with that effect. I PM'd him asking about this and I'll post his response, this could be a key piece of the puzzle.

Unsuccessful Replications

klickUK -- no joy

(2.5 min)

• Xpenzif Replication - Tried to replicate the xpenzif device. Disappointing result. If you think you know where I'm going wrong, build it better and post ;) Since making vid, I have changed the configuration slightly by increasing the spacing between the screws. Still got the same results. Will continue to play with configuration for a while. (YouTube (http://www.youtube.com/watch?v=8FTWj3ctCnw&watch_response); Oct. 20, 2007)

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(3 min)

• XPENZIF Replication part 2 - "I think this replication is much fairer than the other attempt. The rotor atleast is reasonably faithfull to what I can see on the orriginal post. I got the same results as before." (YouTube (http://www.youtube.com/watch?v=rA3pGixr5rc); Oct. 21, 2007)

klickUK writes here:

I believe the explanation given by xpenzif is fundamentally floored. Please consider this...

The screw underneath a magnet is in its 'Ground State'. In other words all kinetic energy has been used and the force from the magnet to that screw is at its maximum. The next screw on the drum/rotor that should move underneath a magnet must have a force acting on it that is greater than the force acting on the screw in the ground state. But the second screw is much further away, and thus the force is much weaker. There is absolutely no reason why movement should take place. Now consider further that screws that have already passed under a stator magnet are still being attracted to their stator - and this force is in direct opposition to the force of the magnet and screw that is supposed to be next under the magnet. So, the force that is required to overcome the screw in its ground state = force of magnet on next screw on the drum minus the force from magnets on screws that have just passed the stator.

My device does exactly what its supposed to do. It breaks and stops when a the force of the magnet on a screw in the ground state is greater than the force provided by my hand when I push start it.

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CLaNZeR -- no joy

On Oct. 19, 2007, CLaNZeR writes: [1] (http://www.overunity.com/index.php/topic,3482.msg55229.html#msg55229) [2] (http://www.overunity.com/index.php/topic,3482.msg55258.html#msg55258)

[See video: http://www.overunity.org.uk/CLaNZeRSScrewMotorEffort1.wmv]

Well nothing exciting to report so far.

Will try bury each head into the cardboard pipe to make them follow the curve a bit more, but cannot be assed to spend that much time grinding them all down, unless given more specifics from the original artist as such.

Must admit even without the heads ground down I would of expect atleast a little movement, and if that had occurred then fine tuning such as grinding the heads would of been the next step.

All good fun though.

The pictures show N38 5mm*3mm magnets , 3 stacked on each level. HD bearing stripped of its coil winding to clear any lag and oiled with fine oil. You can blow on it and make it move it is so loose.

Comment 

Sterling D. Allan writes: "I'm guessing that the problem is that your screw heads are not tapered but are more flat.

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Bill Mahess -- no joy yet

On Oct. 19, 2007, Bill Mahess wrote (http://www.overunity.com/index.php/topic,3482.msg55299.html#msg55299)

Take a look at my replication

• Magnetic Motor2 (YouTube (http://www.youtube.com/watch?v=DQAWmUm6fEs) Oct. 19, 2007

"I can get about a 1/4 turn at this point. Screw placement is very critical. I noticed that the area where the 1/4 turn (about 2 1/2 screw lengths) is slightly different in configuration than the rest of the arrangement so I will attempt to replicate that throughout the whole surface of the coil. I am using a 3 in. pvc with 1" screws."

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Eric Vogels -- no joy

On Oct. 20, Eric Vogels wrote (http://www.overunity.com/index.php?topic=3482.msg55478#msg55478):

Now my replication is done. And it does not work. Every screw is a litle sticky spot.

On Oct. 21, Eric Vogels wrote (http://www.overunity.com/index.php?topic=3482.msg55595#msg55595):

Oops, major construction error in my replication. I forgot to flatten the outside heads. Good thing with hot glue: hot air to remove the screws again. Back to the work shop.

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Wayne -- no joy

On Oct. 20, Wayne wrote (http://www.overunity.com/index.php?topic=3482.msg55481#msg55481):

Well this is mine and just a close up. I got it a pass a few spots, but not a good attraction from screw to screw, used #8 and grinded both sides, makes a good outside V shape, going to try #12 next and have closer together, we see! And why does his ends look black or strange color, maybe heat Temp!! Keep trying guys.

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Rice -- no joy

On Oct. 20, Overunity forum member, "rice" wrote (http://www.overunity.com/index.php?topic=3482.msg55449#msg55449):

Sorry to say everyone; I just finished building this exactly like the film. I grinded the heads perfectly, I used the same exact screws, I used the same exact magnets, I drew a cad template and lined everything up perfectly. It just doesent work. ...How many other people went out and spent 50 bucks on magnets, screws, gluegun, pipe and whatever else only to find you have built another non working magnet motor?... [no photo]

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"Freezer" -- no joy

On Oct. 20, Overunity forum member, "Freezer" wrote (http://www.overunity.com/index.php?topic=3482.msg55543#msg55543):

Sorry for the bad quality, its from my phone. I know I don't have the spacing correct, which very well could be the problem, but I'm not getting much pull in any direction from the screw. It tends to want to stick at the point and head, but that doesn't do much. I gonna try and find some premade triangular pieces of metal, if I can.

"MT" -- no joy

On Oct. 21, Overunity forum member, "MT" wrote (http://www.overunity.com/index.php?topic=3482.msg55569#msg55569):

Here is my first version. I also did not had succes with it. As somebody already said every screw head under magnet forms sticking point and I should say a strong one. If I gather enough further research energy I'll continue with sec. version. My prototype is differed from video that it has longer screws (more turns) this could be problem. I placed them as in the NerzhDishual picture. Also each screw head should be leveled to the body of the screw it should not stick out I think.

Oh man if only the guy said what are the dimensions of screws and how precisely are they placed around tube...

"tenthpart" -- no joy

Oct. 21, 2007

[3] (http://www.rivaire.com/image-cache/DSC02581-2.JPG) [4] (http://www.rivaire.com/image-cache/DSC02585-2.JPG) [5] (http://www.rivaire.com/image-cache/screw-mag.png) Used a vitamin bottle with 8 inch circumference, and used the template in this linked png to place the metal chips (http://www.rivaire.com/image-cache/screw-mag-placement-template.png)... 3/4" in light areas, 1/4" in darker areas.

Chips were cut from roofing gutter material, 1/4" x 3/4" cut with shears, not a CNC ;)

I derived the spacing and dimensions from a vidcap from Xpenzif's video. See image w/funky colors. It is a Fireworks editable PNG in layers should you wish to play with it.

The only thing I did differently was that the neo's are oriented NSNS... I just couldn't get them to sit side by side all oriented on direction. I need to get some thinner neos.

I did not get ANY precession. None. Not even from one chip to the next...

Similar Motors

Jeffery Lacroix motor

(2 min 24 sec) 2004

A very similar motor invented by Jeffery Lacroix is shown in this video. It seems to work pretty well, the only difference is that he uses seven rows of little magnets instead of screws, so it runs on repelling force rather than attractive force.

See also

- Screw-Magnet Motor Open Source Project - home page
- Directory:Magnet Motors
- Other Open Source Projects