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Reports of replications of the [[OS:Screw-Magnet Motor|Screw-Magnet Motor]] design first reported by xpenzif on Oct. 15, 2007.  Several researchers at the [http://www.overunity.com/index.php/topic,3482.0.html OverUnity.com forum], 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 ===
<youtube>8FTWj3ctCnw</youtube><br>
(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. (''[http://www.youtube.com/watch?v=8FTWj3ctCnw&watch_response YouTube]''; Oct. 20, 2007)

- - - -

<youtube>rA3pGixr5rc</youtube><br>
(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." (''[http://www.youtube.com/watch?v=rA3pGixr5rc YouTube]; 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.

- - - -

=== CLaNZeR -- no joy ===
[[Image:CLaNZeR replica of screw-magnet motor with magnets 300.jpg|right]]
''On Oct. 19, 2007, CLaNZeR writes:'' [http://www.overunity.com/index.php/topic,3482.msg55229.html#msg55229] [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 : {{SDA}} writes: "I'm guessing that the problem is that your screw heads are '''not tapered''' but are more flat.
<br style="clear:right;">

- - - -

=== Bill Mahess -- no joy yet ===
''On Oct. 19, 2007, Bill Mahess [http://www.overunity.com/index.php/topic,3482.msg55299.html#msg55299 wrote]''

Take a look at my replication
<youtube>DQAWmUm6fEs</youtube>
*'''Magnetic Motor2''' (''[http://www.youtube.com/watch?v=DQAWmUm6fEs YouTube]'' 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."

- - - -



=== Eric Vogels -- no joy ===
[[Image:Eric vogels replica of screw-magnet motor 250.jpg|right]]
''On Oct. 20, Eric Vogels [http://www.overunity.com/index.php?topic=3482.msg55478#msg55478 wrote]:''

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


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

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.

- - - -
<br style="clear:right;">

=== Wayne -- no joy ===
[[Image:Wayne replic screw-magnet motor 250.jpg|right]]
''On Oct. 20, Wayne [http://www.overunity.com/index.php?topic=3482.msg55481#msg55481 wrote]:''

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.

- - - -
<br style="clear:right;">

=== Rice -- no joy ===
''On Oct. 20, Overunity forum member, "rice" [http://www.overunity.com/index.php?topic=3482.msg55449#msg55449 wrote]:''

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]

- - - -
<br style="clear:right;">

=== "Freezer" -- no joy ===
[[Image:Freezer replica of screw-magnet motor 250.jpg|right]]
''On Oct. 20, Overunity forum member, "Freezer" [http://www.overunity.com/index.php?topic=3482.msg55543#msg55543 wrote]:''

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.
<br style="clear:right;">

=== "MT" -- no joy ===
[[Image:MT replic screw-magnet motor 250.jpg|right]]
''On Oct. 21, Overunity forum member, "MT" [http://www.overunity.com/index.php?topic=3482.msg55569#msg55569 wrote]:''

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...
<br style="clear:right;">

=== "tenthpart" -- no joy ===
[[Image:10thpart replic screw-magnet motor 250.jpg|right]]
''Oct. 21, 2007''

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

<br style="clear:right;">

= Similar Motors =

=== Jeffery Lacroix motor ===

<youtube>Int5za7Eslo</youtube><br>
(2 min 24 sec)
''2004''

A very similar motor invented by [[Directory:Perendev:Jeffery_Lacroix | 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 =

{{SMM footer}}

[[Category:Magnet Motors]]
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