O.U. Magnet force shielding 1

[Floor]

Floor are you sure the mags will separate 2 inches. I'd think more like 1 but that would  still be
OU 20....

Norman

Sorry.  You are correct more like 1 inch (shield out) in order to still have a second
out put (by attraction) once the shield is re installed ?  I'm hazy on it right now.
Looking at several designs in a short span, gets me mixed up to sometimes.

Unless 2 or more units were combined (series ouputs). In which case input to output
ratio is unchanged, but longer output strokes will be easier to efficiently utilize.

Also
   I need to finish / button up a home repair project I've got opened up right now.

[Floor]

An update (not major)

Short video 5 min 32 sec.

https://www.dailymotion.com/video/x84i5ns

   floor

[Floor]

General information

The testing or measuring of these various magnet interactions sets generally
follows along these lines.

Testing hand held magnets, just by feel

Mounting one or more of the magnets used in the set, on a sliding track,
then testing by feel.

Taking a few measurements in large increments of force and distance.
This gives a rough picture of the over all force to distance curves that are present.

A first set of measurements of each action. 

Some math as force averaging, additions and subtractions and possibly
conversions necessary to convert to joules etcetera.

Final overall totals of inputs to outputs and the overall ratio of in to out.
... ... ... ... ... ... ... ... ... ... ... ...
The above is all preliminary.

If everything is looking good...

Generally...

Check parameters, accuracy of the weight scales, accuracy of the levelness
of the rail system, accuracy of any alignments in terms of  90 degree alignments.

Each force and distance measurement is repeated five times and logged individually.

The calculations are done and checked.
... ... ... ... ... ... ... ... ... ... ... ...
This can amount to from as few as 40 or 50  measurements or up to as many as
400 measurements.

Note.  I do not always follow through to this degree of rigor.
for example in the "Magnet shear to direct pull work ratio" topic,
I did not follow up with this degree of rigor.

I was lacking the energy and motivation to do so on that day.  Otherwise
I would have also presented those logs.

[norman6538]

"Closer stronger further weaker" wins again. My tests show about 200% for 3/4 x 1 inch magnets and for the domino sized it is barely over 100%.  I used two drawer slides to get the linear movement instead of the arc of a bicycle wheel. My results do not warrant the waste of a photo upload...

I find it quite interesting that Floor has not recently followed up with any measurements.

Therefore I suggest that Floor......... and I leave that for you to fill in the blanks...

"I'm from Mo. - show me."

Norman

[Floor]

@ Norman6538


This PDF, ( Kedron Eden Project) says that using magnets of smaller dimensions is best.
Magnetic force drops off with distance.  Two magnets of large physical dimensions will  not
interact with one another in nearly the same manner as will two small magnets.

https://overunity.com/18551/magnet-shear-to-direct-pull-work-ratio/msg560757/#msg560757

This might not seem reasonable, and I myself, do not understand fully enough to offer
a good explanation. All I can say of that, at present is,  simply put...


The force from a    20   mm x 5 mm x 5 mm neo magnet (poles at the ends) will drop off
as the distance from a pole increases. 

Take a force to distance measurement at 20 mm from a pole (magnet's length) , and compare
it to the force to distance measured at 5 mm.

Do the same with a   40   mm x 5 mm x 5 mm magnet (poles at the ends).
The length dimension is doubled, but the field does not extend to twice as far as does
the field of the 20mm long magnet.

At magnet's length (40 mm) from a pole, the force will not be as strong as the force from
the 20 mm magnet was, at 20 mm (magnet's length).

This is a simplistic example but with other shapes of magnets the amount the
field strength decreases with distance can be even more dramatic.

As I said, the / my explanation is a simplistic one.