Magnets, motion and measurement

[Floor]

These two videos by citfta, are of a design he built,  which the Tinman presented.

https://youtu.be/1_CrU7M46S4
https://youtu.be/tUHtlruVSus

Nice build and nice short demos !


But to be clear, they are
          NOT REPRESENTATIONS
of the designs I have presented, and they are not the design which citfta originally stated that he intended to build.

I am planning to build a device based on your rack design.  Shown in this PDF: Rack Action 3 complete.pdf
I plan to have some weight on the upper arm and magnet to return it to the start position after the shield magnet is back in place.  Then remove the shield magnet again to restart the cycle.

Carroll

or
https://overunity.com/16954/magnets-motion-and-measurement/dlattach/attach/173069/

Best wishes
           floor

[Floor]

@All readers

And respectfully,I'll say, that it is up to citfta, as to if he wants to modify it
into one of my designs.....  or not.

best wishes
      floor

[citfta]

These two videos by citfta, are of a design he built,  which the Tinman presented.

https://youtu.be/1_CrU7M46S4
https://youtu.be/tUHtlruVSus

Nice build and nice short demos !


But to be clear, they are
          NOT REPRESENTATIONS
of the designs I have presented, and they are not the design which citfta originally stated that he intended to build.
                            or
https://overunity.com/16954/magnets-motion-and-measurement/dlattach/attach/173069/

Best wishes
           floor

Hi Floor,

Can you please explain why you feel my build is not an exact replication of your rack 3 design.  I am a little confused.  You PDF shows two magnets in opposition to each other and connected by a rack and pinion gear arrangement.  And a shield magnet in between the opposing magnets.  So why do you feel I have not correctly built your rack 3 device?  The only difference between the videos and what  I said I was going to build is that I haven't added a weight yet to the rack assembly.


Respectfully,
Carroll

[Floor]

Hi citfta  No problem.  Thanks for your questioning.  Sometimes my example drawings are
not as good as I thought they were.

I like your build.  Very nice rack and pinion action. Nice and smooth action on the
cross slide too.

But the orientation / direction of the shield magnet is 90 degrees off.

If you rotated it so that its broad faces were up and down that would be
one of the designs I have presented.  But I don't recommend that.
                           Because,.....
1. with the magnet shapes you are using,  the sliding magnets
would be too far apart, even when they are pushed toward each other.
2. You would be shielding two magnets with just a single one.

A better solution (but still inadequate solution)is to use two magnets in
the shield magnet position.

These would be stacked, on edge, one above the other.

A NORTH pole of the upper one facing (for example) LEFT.
A SOUTH pole of the underneath magnet should then be facing LEFT.

The magnets will be attracted to each other, and stick together, when
assembled edge to edge like that.

During the insertion and removal of this shield magnet array, the line
where the two shield magnets meet each other (junction), should be
at the vertical center of the output magnets.

                              But there is a second problem.

Because the output magnets in your build have their longest dimension
oriented as up and down. You will actually need to use FOUR magnets in
the shielding array. 
                                             because
1. Two magnets (as I described), would not be as tall as the output magnets.
                                               and
2. Three magnets as the shield would not create the correct balance in the forces

Those FOUR magnets in the shield array, should be alternating in face / pole orientations,

Because of the good quality of your build, I think you will be quite pleased with the ease of the
insertion and removal of the shield magnets (which are now a simple array).  That ease of
insertion and removal wont be changed very much if the output magnets are either near or far.
The difference between shielded an un-shielded output repulsion will be big.
                      regards
                            floor

[Floor]

@ citfta

Sorry but I had to cut that last post short.  I ran out of time / had to go some where.

But yet again, using 4 magnets in the shielding magnets position will present still
other problems.  I cant get into those at this time.

No worries and no hurries though.
.....................................
The only debugging solution I have for your other wise excellent build.

1. remove all the magnets.

2. reorient the output magnets. 

Rotate them so that when the shield magnets pass between them,
it is centered along the LONG AXIS of those output magnets.


3. reorient the shield magnet, but also replace it with two magnets.

These would be stacked, on edge, one above the other (along their long axis sides).

A NORTH pole of the upper one facing (for example) LEFT.
A SOUTH pole of the underneath magnet should THEN also be facing LEFT.

The magnets will be attracted to each other, and stick together, when
assembled edge to edge like that.

During the insertion and removal of this shield magnet array, the line
where the two shield magnets meet each other (junction), should be
at the vertical center of the output magnets.  Which have now been
reoriented so that it is along their long axis that the shield magnet array
passes.