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Author Topic: Magnets, motion and measurement  (Read 171487 times)

Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #270 on: July 31, 2019, 11:28:54 PM »
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: (https://overunity.com/Themes/default/images/icons/clip.gif) 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

  • Guest
Re: Magnets, motion and measurement
« Reply #271 on: July 31, 2019, 11:36:21 PM »
@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

  • Hero Member
  • *****
  • Posts: 1050
Re: Magnets, motion and measurement
« Reply #272 on: August 01, 2019, 12:08:31 PM »
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

  • Guest
Re: Magnets, motion and measurement
« Reply #273 on: August 01, 2019, 04:20:46 PM »
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

  • Guest
Re: Magnets, motion and measurement
« Reply #274 on: August 01, 2019, 07:20:37 PM »
@ 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.

citfta

  • Hero Member
  • *****
  • Posts: 1050
Re: Magnets, motion and measurement
« Reply #275 on: August 02, 2019, 12:34:34 AM »
Hi Floor,

Thanks for your reply.  I now understand where I went wrong with my build although I am still pleased with how it works.  I will be pretty tied up the next few days again but will be thinking how I can implement the changes you have suggested.  Thanks again for all your time and efforts in doing the research involved your study of magnets.

Carroll

Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #276 on: August 02, 2019, 10:23:24 PM »
@ citfta

              acknowledged
               
             

Here is a preview of my next build.  Same design as I recommended  to you,
but differing due to a use of 4 magnets in the outputs (2 each) and 4 magnets in the shield.

                https://dai.ly/x7f0i61

                      best wishes
                               floor

Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #277 on: August 02, 2019, 10:36:21 PM »
A brief video by me that shows a method of imprinting multiple poles into a ceramic magnet.
                          @
           https://dai.ly/x7f0jpy

     floor


Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #278 on: August 02, 2019, 11:25:34 PM »
My own replication of a brute force neutralization of magnetic force as demonstrated by  the Tinman.

                    PART 1
https://www.dailymotion.com/video/x7f0md2

        floor

Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #279 on: August 02, 2019, 11:47:24 PM »
My own replication of a brute force neutralization of magnetic force as demonstrated by  the Tinman.

                    PART 2
                        @
https://www.dailymotion.com/video/x7f0o4w


Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #280 on: August 07, 2019, 09:48:30 PM »
Floor's  balancing neutralization part 2 video.

                   https://dai.ly/x7ffco0

                             floor

Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #281 on: August 07, 2019, 10:01:02 PM »
Restoring ceramic magnets, breif video.

https://www.dailymotion.com/video/x7ffe07

               floor

Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #282 on: August 10, 2019, 10:53:33 PM »
It is not problematic, If the output magnets have some attraction, when the shield
magnet array is in place.

https://overunity.com/16954/magnets-motion-and-measurement/dlattach/attach/173702/

  floor

Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #283 on: August 14, 2019, 09:18:24 PM »
@citfta

During the video demonstration  @ https://www.dailymotion.com/video/x728wd9

of the " MagForShld 1b.pdf"  @  https://overunity.com/18137/newtons-magnets/dlattach/attach/173835/

The Two magnets in the shielding position are glued together edge to edge.

They are in repulsion.

Note 1. One of  those ceramic shield magnets was considerably weaker than the other.  They did not shield well AT ALL, when
I reoriented/ flipped them top for bottom. 

I have since that time, done many repeats of those particular interactions, with well matched magnets in the shielding position, as well
as in the output magnet positions. I have had good results.  I have never mounted that configuration on track systems.

Note 2. notice (in the video x728wd9) that the shield magnet is not well centered (up and down).  This is why the shielding worked
only when oriented a certain way and not the other, one shield magnet extends beyond the tops of the fixed and output magnet.
I think that was the weaker of the two shield magnets ?

Note 3  given that your ceramic magnets are all from the same supplier / manufacturer, treating them with neo magnets can
equalize them nicely (video   @   https://www.dailymotion.com/video/x7ffe07  ).

         Thanks  for all your good work / experimentation.

                         floor

Floor

  • Guest
Re: Magnets, motion and measurement
« Reply #284 on: August 15, 2019, 08:09:01 AM »
An innovation by I don't know who. Some combination of
communications and miscomunications ?

             floor