Magnets, motion and measurement

[citfta]

Here is a short video showing my build of Floor's rack 3 design from his PDF.  As he has said it must have pretty accurate alignment before it will work properly.  But it can be made to work as you can see in the video.  The magnets in the video are just cheap magnets from Lowe's.  After mounting them I found the strength varied some making the adjustments a little harder.  A gauss meter used to help match up the strength of the magnets would probably be a help in making a better build.


https://youtu.be/1_CrU7M46S4

Carroll

[Floor]

@ CITFTA

Pretty good results !

I hope you made your test bed easy to modify

Two outer magnets tend to overpower a single shield magnet.  Where as, an over sized (broader)
shield magnet doesn't adversely effect the shielding but instead (up to a point) improves it.

Your shielding would be improved by the use of a shield magnet that is about twice as broad as the one you used
                   or
2 magnets as below (this works just fine).

Also note that,  when using a broader shield magnet, the fine tuning / adjusting,  is easier and can be less precise.

              floor

[citfta]

Thanks for the suggestion Floor.  Do you know if a thinner shield magnet would still work as a shield?  I am thinking that would allow the rack magnets to get closer together so they would have more repelling force when the shield magnet is removed.  I can fairly easily make changes to my test bed as everything is mounted with screws and assembled with bolts and nuts.

Carroll

[lumen]

@ citfta

Before you tear it down you might want to try to determine what if any problems exist for the setup.
I found that when two magnets are pushing apart at close proximity there is some additional force required to remove the shield.
When the magnets are operated in attraction the shield would need more force to insert.

You might try a thin neo for the shield but it could also destroy the ceramic magnets if too close.

Nice sturdy setup though.

[telecom]

Here is a short video showing my build of Floor's rack 3 design from his PDF.  As he has said it must have pretty accurate alignment before it will work properly.  But it can be made to work as you can see in the video.  The magnets in the video are just cheap magnets from Lowe's.  After mounting them I found the strength varied some making the adjustments a little harder.  A gauss meter used to help match up the strength of the magnets would probably be a help in making a better build.


https://youtu.be/1_CrU7M46S4

Carroll

Hi Carroll,
can you make some basic measurement of the forces x distance?
I like how you make them moving synchronously with the roller.